{"id":10179,"date":"2018-03-08T05:14:33","date_gmt":"2018-03-08T05:14:33","guid":{"rendered":"https:\/\/data-flair.training\/blogs\/?p=10179"},"modified":"2019-09-28T14:57:16","modified_gmt":"2019-09-28T09:27:16","slug":"best-python-interview-questions","status":"publish","type":"post","link":"https:\/\/data-flair.training\/blogs\/best-python-interview-questions\/","title":{"rendered":"Top 30 Python Interview Questions and Answers"},"content":{"rendered":"<div class='__iawmlf-post-loop-links' style='display:none;' data-iawmlf-post-links='[{&quot;id&quot;:149,&quot;href&quot;:&quot;https:\\\/\\\/www.python.org&quot;,&quot;archived_href&quot;:&quot;http:\\\/\\\/web-wp.archive.org\\\/web\\\/20251206090101\\\/https:\\\/\\\/www.python.org\\\/&quot;,&quot;redirect_href&quot;:&quot;&quot;,&quot;checks&quot;:[{&quot;date&quot;:&quot;2025-12-06 12:20:59&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2025-12-09 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03:08:37&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-05-21 06:27:39&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-05-24 07:06:36&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-05-27 07:30:50&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-05-30 08:47:47&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-06-02 09:37:18&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-06-05 09:43:29&quot;,&quot;http_code&quot;:206}],&quot;broken&quot;:false,&quot;last_checked&quot;:{&quot;date&quot;:&quot;2026-06-05 09:43:29&quot;,&quot;http_code&quot;:206},&quot;process&quot;:&quot;done&quot;}]'><\/div>\n<h2>1. Python Interview Questions and Answers<\/h2>\n<p>Welcome to our Python Interview Questions and answers series. Today, we will look at some more interview questions for Python, some basic to advanced interview questions to help you to prepare for your interview. There are Python coding interview questions, Python developer interview questions Python scripting interview question as well as Data structure interview questions. In case you missed <strong><a href=\"https:\/\/data-flair.training\/blogs\/top-python-interview-questions-answer-2018\/\">Python Interview Questions Part I<\/a><\/strong>, check it out.<br \/>\nSo, let\u2019s begin Interview Questions of Python Programming Language.<br \/>\n<em>If you can DREAM it, you can ACHIEVE it.<\/em><\/p>\n<div id=\"attachment_10210\" style=\"width: 812px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2018\/03\/Python-interview-Questions-1.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-10210\" class=\"wp-image-10210 size-full\" src=\"https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2018\/03\/Python-interview-Questions-1.jpg\" alt=\"Python interview Questions\" width=\"802\" height=\"420\" srcset=\"https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2018\/03\/Python-interview-Questions-1.jpg 802w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2018\/03\/Python-interview-Questions-1-150x79.jpg 150w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2018\/03\/Python-interview-Questions-1-300x157.jpg 300w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2018\/03\/Python-interview-Questions-1-768x402.jpg 768w\" sizes=\"auto, (max-width: 802px) 100vw, 802px\" \/><\/a><p id=\"caption-attachment-10210\" class=\"wp-caption-text\">Python interview Questions<\/p><\/div>\n<p><strong>Q.1. What data types does Python support?<\/strong><\/p>\n<p>This is the most basic python interview question.<\/p>\n<p>Python provides us with five kinds of data types:<\/p>\n<ul>\n<li><strong>Numbers-<\/strong>\u00a0<a href=\"https:\/\/data-flair.training\/blogs\/python-number-types-conversion\/\">Numbers<\/a> use to hold numerical values.<\/li>\n<\/ul>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; a=7.0\r\n&gt;&gt;&gt;<\/pre>\n<ul>\n<li><strong>Strings-<\/strong> A <a href=\"https:\/\/data-flair.training\/blogs\/python-strings\/\">string<\/a> is a sequence of characters. \u00a0We declare it using single or double quotes.<\/li>\n<\/ul>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; title=\"Ayushi's Book\"<\/pre>\n<ul>\n<li><strong>Lists-<\/strong> A <a href=\"https:\/\/data-flair.training\/blogs\/python-list-comprehension\/\">list<\/a> is an ordered collection of values, and we declare it using square brackets.<\/li>\n<\/ul>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; colors=['red','green','blue']\r\n&gt;&gt;&gt; type(colors)<\/pre>\n<p><strong>&lt;class &#8216;list&#8217;&gt;<\/strong><\/p>\n<ul>\n<li><strong>Tuples-<\/strong> A <a href=\"https:\/\/data-flair.training\/blogs\/python-tuples-syntax-examples\/\">tuple<\/a>, like a list, is an ordered collection of values. The difference. However, is that a tuple is immutable. This means that we cannot change a value in it.<\/li>\n<\/ul>\n<div id=\"attachment_26362\" style=\"width: 1210px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2018\/08\/Python-Data-Types-01.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-26362\" class=\"wp-image-26362 size-full\" src=\"https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2018\/08\/Python-Data-Types-01.jpg\" alt=\"Python Interview Questions and Answers\" width=\"1200\" height=\"628\" srcset=\"https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2018\/08\/Python-Data-Types-01.jpg 1200w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2018\/08\/Python-Data-Types-01-150x79.jpg 150w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2018\/08\/Python-Data-Types-01-300x157.jpg 300w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2018\/08\/Python-Data-Types-01-768x402.jpg 768w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2018\/08\/Python-Data-Types-01-1024x536.jpg 1024w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><\/a><p id=\"caption-attachment-26362\" class=\"wp-caption-text\">Python Interview Questions and Answers &#8211; Python Data Types<\/p><\/div>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; name=('Ayushi','Sharma')\r\n&gt;&gt;&gt; name[0]='Avery'<\/pre>\n<p><em>Traceback (most recent call last):<\/em><br \/>\n<em> File &#8220;&lt;pyshell#129&gt;&#8221;, line 1, in &lt;module&gt; <\/em><br \/>\n<em>name[0]=&#8217;Avery&#8217;<\/em><br \/>\n<em>TypeError: &#8216;tuple&#8217; object does not support item assignment<\/em><\/p>\n<ol>\n<li><strong>Dictionary-<\/strong> A <a href=\"https:\/\/data-flair.training\/blogs\/python-dictionaries\/\">dictionary<\/a> is a data structure that holds key-value pairs. We declare it using curly braces.<\/li>\n<\/ol>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; squares={1:1,2:4,3:9,4:16,5:25}\r\n&gt;&gt;&gt; type(squares)<\/pre>\n<p><strong>&lt;class &#8216;dict&#8217;&gt;<\/strong><\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; type({})<\/pre>\n<p><strong>&lt;class &#8216;dict&#8217;&gt;<\/strong><br \/>\nWe can also use a dictionary comprehension:<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; squares={x:x**2 for x in range(1,6)}\r\n&gt;&gt;&gt; squares<\/pre>\n<p>{1: 1, 2: 4, 3: 9, 4: 16, 5: 25}<\/p>\n<p><strong><a href=\"https:\/\/data-flair.training\/blogs\/data-structures-in-python-lists-tuples-sets-dictionaries\/\">Follow this link to know more about Python Data\u00a0Structure<\/a><\/strong><\/p>\n<p><strong>Q.2. What is a docstring?<\/strong><\/p>\n<p>A docstring is a documentation string that we use to explain what a construct does. We place it as the first thing under a function, class, or a method, to describe what it does. We declare a docstring using three sets of single or double quotes.<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; def sayhi():\r\n    \"\"\"\r\n    The function prints Hi\r\n    \"\"\"\r\n    print(\"Hi\")\r\n&gt;&gt;&gt; sayhi()<\/pre>\n<p><strong>Hi<\/strong><\/p>\n<p>To get a function\u2019s docstring, we use its __doc__ attribute.<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; sayhi.__doc__<\/pre>\n<p>&#8216;\\n\\tThis function prints Hi\\n\\t&#8217;<\/p>\n<p>A docstring, unlike a comment, is retained at runtime.<\/p>\n<p><strong>Q.3. What is the PYTHONPATH variable?<\/strong><\/p>\n<p>PYTHONPATH is the <a href=\"https:\/\/data-flair.training\/blogs\/python-variable-scope\/\">variable<\/a> that tells the interpreter where to locate the module files imported into a program. Hence, it must include the Python source library directory and the directories containing Python source code. You can manually set PYTHONPATH, but usually, the Python installer will preset it.<\/p>\n<h2>2. Basic Python Interview Questions<\/h2>\n<p><strong>Q.4. What is slicing?<\/strong><\/p>\n<p>These are the types of basic Python interview questions for freshers.<br \/>\nSlicing is a technique that allows us to retrieve only a part of a <strong><a href=\"https:\/\/data-flair.training\/blogs\/python-list-comprehension\/\">list<\/a><\/strong>, tuple, or string. For this, we use the slicing operator [].<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; (1,2,3,4,5)[2:4]<\/pre>\n<p>(3, 4)<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; [7,6,8,5,9][2:]<\/pre>\n<p>[8, 5, 9]<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; 'Hello'[:-1]<\/pre>\n<p>&#8216;Hell&#8217;<\/p>\n<p><strong>Q.5. What is a namedtuple?<\/strong><\/p>\n<p>A namedtuple will let us access a tuple\u2019s elements using a name\/label. We use the function namedtuple() for this, and import it from collections.<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; from collections import namedtuple\r\n&gt;&gt;&gt; result=namedtuple('result','Physics Chemistry Maths') #format\r\n&gt;&gt;&gt; Ayushi=result(Physics=86,Chemistry=95,Maths=86) #declaring the tuple\r\n&gt;&gt;&gt; Ayushi.Chemistry<\/pre>\n<p>95<\/p>\n<p>As you can see, it let us access the marks in Chemistry using the Chemistry attribute of object Ayushi.<\/p>\n<p>To learn more about namedtuples, refer to <strong><a href=\"https:\/\/data-flair.training\/blogs\/python-namedtuple\/\">namedtuple in Python<\/a><\/strong>.<\/p>\n<p><strong>Q.6. How would you declare a comment in Python?<\/strong><\/p>\n<p>Unlike languages like C++, Python does not have multiline <strong><a href=\"https:\/\/data-flair.training\/blogs\/python-comment\/\">comments<\/a><\/strong>. All it has is octothorpe (#). Anything following a hash is considered a comment, and the interpreter ignores it.<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; #line 1 of comment\r\n&gt;&gt;&gt; #line 2 of comment<\/pre>\n<p>In fact, you can place a comment anywhere in your code. You can use it to explain your code.<\/p>\n<p><strong>Q.7. How would you convert a string into an int in Python?<\/strong><\/p>\n<p>If a <strong><a href=\"https:\/\/data-flair.training\/blogs\/python-strings\/\">string<\/a><\/strong> contains only numerical characters, you can convert it into an integer using the int() function.<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; int('227')<\/pre>\n<p>227<\/p>\n<p>Let\u2019s check the types:<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; type('227')<\/pre>\n<p><strong>&lt;class &#8216;str&#8217;&gt; <\/strong><\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; type(int('227'))<\/pre>\n<p><strong>\u00a0&lt;class &#8216;int&#8217;&gt;<\/strong><\/p>\n<p><strong>Q.8. How do you take input in Python?<\/strong><\/p>\n<p>For taking input from user, we have the function input(). In Python 2, we had another function raw_input().<\/p>\n<p>The<strong><a href=\"https:\/\/data-flair.training\/blogs\/python-built-in-functions\/\"> input() function <\/a><\/strong>takes, as an argument, the text to be displayed for the task:<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; a=input('Enter a number')<\/pre>\n<p>Enter a number7<\/p>\n<p>But if you have paid attention, you know that it takes input in the form of a string.<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; type(a)<\/pre>\n<p><strong>&lt;class &#8216;str&#8217;&gt;<\/strong><\/p>\n<p>Multiplying this by 2 gives us this:<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; a*=2\r\n&gt;&gt;&gt; a<\/pre>\n<p>&#8217;77&#8217;<\/p>\n<p>So, what if we need to work on an integer instead?<\/p>\n<p>We use the int() function for this.<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; a=int(input('Enter a number'))<\/pre>\n<p>Enter a number7<\/p>\n<p>Now when we multiply it by 2, we get this:<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; a*=2\r\n&gt;&gt;&gt; a<\/pre>\n<p>14<\/p>\n<p><strong>Q.9. What is a frozen set in Python?<\/strong><\/p>\n<p>Answer these type of Python Interview Questions with Examples.<\/p>\n<p>First, let\u2019s discuss what a set is. A set is a collection of items, where there cannot be any duplicates. A set is also unordered.<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; myset={1,3,2,2}\r\n&gt;&gt;&gt; myset<\/pre>\n<p>{1, 2, 3}<\/p>\n<p>This means that we cannot index it.<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; myset[0]<\/pre>\n<p><em>Traceback (most recent call last): <\/em><br \/>\n<em>File &#8220;&lt;pyshell#197&gt;&#8221;, line 1, in &lt;module&gt; <\/em><br \/>\n<em>myset[0]<\/em><br \/>\n<em>TypeError: &#8216;set&#8217; object does not support indexing<\/em><\/p>\n<p>However, a set is mutable.<a href=\"https:\/\/data-flair.training\/blogs\/python-built-in-functions\/\"> A frozen set is immutable<\/a>. This means we cannot change its values. This also makes it eligible to be used as a key for a dictionary.<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; myset=frozenset([1,3,2,2])\r\n&gt;&gt;&gt; myset<\/pre>\n<p>frozenset({1, 2, 3})<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; type(myset)<\/pre>\n<p>&lt;class &#8216;frozenset&#8217;&gt;<\/p>\n<p>For more insight on sets, refer to <strong><a href=\"https:\/\/data-flair.training\/blogs\/python-sets-and-booleans-with-syntax-and-examples\/\">Python Sets and Booleans<\/a><\/strong>.<\/p>\n<p><strong>Q.10. How would you generate a random number in Python?<\/strong><\/p>\n<p>This kind of Python interview Questions and Answers can Prove your depth of knowledge.<\/p>\n<p>To generate a random number, we import the function random() from the module random.<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; from random import random\r\n&gt;&gt;&gt; random()<\/pre>\n<p>0.7931961644126482<\/p>\n<p>Let\u2019s call for help on this.<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; help(random)<\/pre>\n<p><a href=\"https:\/\/data-flair.training\/blogs\/python-built-in-functions\/\">Help on built-in function <\/a>random:<\/p>\n<p>random(&#8230;) method of random.Random instance<br \/>\nrandom() -&gt; x in the interval [0, 1).<\/p>\n<p>This means that it will return a random number equal to or greater than 0, and less than 1.<\/p>\n<p>We can also use the function randint(). It takes two arguments to indicate a range from which to return a random integer.<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; from random import randint\r\n&gt;&gt;&gt; randint(2,7)<\/pre>\n<p>6<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; randint(2,7)<\/pre>\n<p>5<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; randint(2,7)<\/pre>\n<p>7<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; randint(2,7)<\/pre>\n<p>6<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; randint(2,7)<\/pre>\n<p>2<\/p>\n<p><strong>Q.11. How will you capitalize the first letter of a string?<\/strong><\/p>\n<p>Simply using the <strong><a href=\"https:\/\/data-flair.training\/blogs\/python-strings\/\">method capitalize().<\/a><\/strong><\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; 'ayushi'.capitalize()<\/pre>\n<p>&#8216;Ayushi&#8217;<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; type(str.capitalize)<\/pre>\n<p>&lt;class &#8216;method_descriptor&#8217;&gt;<\/p>\n<p>However, it will let other characters be.<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; '@yushi'.capitalize()<\/pre>\n<p>&#8216;@yushi&#8217;<\/p>\n<p><strong>Q.12. How will you check if all characters in a string are alphanumeric?<\/strong><\/p>\n<p>For this, we use the method isalnum().<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; 'Ayushi123'.isalnum()<\/pre>\n<p>True<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; 'Ayushi123!'.isalnum()<\/pre>\n<p>False<\/p>\n<p>Other methods that we have include:<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; '123.3'.isdigit()<\/pre>\n<p>False<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; '123'.isnumeric()<\/pre>\n<p>True<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; 'ayushi'.islower()<\/pre>\n<p>True<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; 'Ayushi'.isupper()<\/pre>\n<p>False<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; 'Ayushi'.istitle()<\/pre>\n<p>True<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; '   '.isspace()<\/pre>\n<p>True<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; '123F'.isdecimal()<\/pre>\n<p>False<\/p>\n<p><strong>Q.13. What is the concatenation?<\/strong><\/p>\n<p>This is very basic Python Interview Question, try not to make any mistake in this.<\/p>\n<p>Concatenation is joining two sequences. We use the + operator for this.<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; '32'+'32'<\/pre>\n<p>&#8216;3232&#8217;<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; [1,2,3]+[4,5,6]<\/pre>\n<p>[1, 2, 3, 4, 5, 6]<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; (2,3)+(4)<\/pre>\n<p><em>Traceback (most recent call last):<\/em><br \/>\n<em>File &#8220;&lt;pyshell#256&gt;&#8221;, line 1, in &lt;module&gt;<\/em><br \/>\n<em>(2,3)+(4)<\/em><br \/>\n<em>TypeError: can only concatenate tuple (not &#8220;int&#8221;) to tuple<\/em><\/p>\n<p>Here, 4 is considered an int. Let\u2019s do this again.<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; (2,3)+(4,)<\/pre>\n<p>(2, 3, 4)<\/p>\n<p>Any query yet in basic Python interview questions and answers for freshers? Please Comment.<\/p>\n<p><strong>Q.14. What is a function?<\/strong><\/p>\n<p>When we want to execute a sequence of statements, we can give it a name. Let\u2019s define a function to take two numbers and return the greater number.<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; def greater(a,b):\r\n       return a is a&gt;b else b\r\n&gt;&gt;&gt; greater(3,3.5)<\/pre>\n<p>3.5<\/p>\n<p>You can create your own function or use one of Python\u2019s many<strong> <a href=\"https:\/\/data-flair.training\/blogs\/python-built-in-functions\/\">built-in functions<\/a><\/strong>.<\/p>\n<p><strong>Q.15. Explain lambda expressions. When would you use one?<\/strong><\/p>\n<p>When we want a function with a single expression, we can define it anonymously. A lambda expression may take input and returns a value. To define the above function as a lambda expression, we type the following code in the interpreter:<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; (lambda a,b:a if a&gt;b else b)(3,3.5)<\/pre>\n<p>3.5<\/p>\n<p>Here, a and b are the inputs. a if a&gt;b else b is the expression to return. The arguments are 3 and 3.5.<br \/>\nIt is possible to not have any inputs here.<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; (lambda :print(\"Hi\"))()<\/pre>\n<p>Hi<\/p>\n<p>For more insight into lambdas, refer to<strong> <a href=\"https:\/\/data-flair.training\/blogs\/python-lambda-expressions\/\">Lambda Expressions in Python<\/a><\/strong>.<\/p>\n<p><strong>Q.16. What is recursion?<\/strong><\/p>\n<p>When a function makes a call to itself, it is termed recursion. But then, in order for it to avoid forming an infinite loop, we must have a base condition.<\/p>\n<p>Let\u2019s take an example.<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; def facto(n):\r\n    if n==1: return 1\r\n    return n*facto(n-1)\r\n&gt;&gt;&gt; facto(4)<\/pre>\n<p>24<\/p>\n<p>For more on recursion, visit <a href=\"https:\/\/data-flair.training\/blogs\/recursion-in-python\/\"><strong>Recursion in Python<\/strong>.<\/a><\/p>\n<p><strong>Q.17. What is a generator?<\/strong><\/p>\n<p><a href=\"https:\/\/data-flair.training\/blogs\/python-generator\/\"><strong>Python generator<\/strong><\/a> produces a sequence of values to iterate on. This way, it is kind of an iterable.<\/p>\n<p>We define a function that \u2018yields\u2019 values one by one, and then use a for loop to iterate on it.<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; def squares(n):\r\n    i=1\r\n    while(i&lt;=n):\r\n        yield i**2\r\n        i+=1\r\n&gt;&gt;&gt; for i in squares(7):\r\n    print(i)<\/pre>\n<p>1<br \/>\n4<br \/>\n9<br \/>\n16<br \/>\n25<br \/>\n36<br \/>\n49<\/p>\n<p><strong>Q.18. So, what is an iterator, then?<\/strong><\/p>\n<p>An iterator returns one object at a time to iterate on. To create an iterator, we use the iter() function.<br \/>\nodds=iter([1,3,5,7,9])<\/p>\n<p>Then, we call the next() function on it every time we want an object.<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; next(odds)<\/pre>\n<p>1<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; next(odds)<\/pre>\n<p>3<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; next(odds)<\/pre>\n<p>5<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; next(odds)<\/pre>\n<p>7<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; next(odds)<\/pre>\n<p>9<br \/>\nAnd now, when we call it again, it raises a StopIteration exception. This is because it has reached the end of the values to iterate on.<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; next(odds)<\/pre>\n<p><em>Traceback (most recent call last):<\/em><br \/>\n<em>File &#8220;&lt;pyshell#295&gt;&#8221;, line 1, in &lt;module&gt;<\/em><br \/>\n<em>next(odds)<\/em><br \/>\n<em>StopIteration<\/em><\/p>\n<p>For more on iterators, refer to <strong><a href=\"https:\/\/data-flair.training\/blogs\/python-iterator\/\">Python iterators<\/a><\/strong>.<\/p>\n<p><strong>Q.19. Okay, we asked you about generators and iterators, and you gave us the right answers. But don\u2019t they sound similar?<\/strong><\/p>\n<p>They do, but there are subtle differences:<\/p>\n<ol>\n<li>For a generator, we create a function. For an iterator, we use in-built functions iter() and next().<\/li>\n<li>For a generator, we use the keyword \u2018yield\u2019 to yield\/return an object at a time.<\/li>\n<li>A generator may have as many \u2018yield\u2019 statements as you want.<\/li>\n<li>A generator will save the states of the local variables every time \u2018yield\u2019 will pause the loop. An iterator does not use local variables; it only needs an iterable to iterate on.<\/li>\n<li>Using a class, you can implement your own iterator, but not a generator.<\/li>\n<li>Generators are fast, compact, and simpler.<\/li>\n<li>Iterators are more memory-efficient.<\/li>\n<\/ol>\n<p>Read <strong><a href=\"https:\/\/data-flair.training\/blogs\/python-generator-vs-iterator\/\">Generators vs Iterators in Python<\/a><\/strong>.<\/p>\n<p><strong>Q.20. We know Python is all the rage these days. But to be truly accepting of a great technology, you must know its pitfalls as well. Would you like <\/strong><strong>to talk about this?<\/strong><\/p>\n<p>Of course. To be truly yourself, you must be accepting of your flaws. Only then can you move forward to work on them. Python has its flaws too:<\/p>\n<ol>\n<li>Python\u2019s interpreted nature imposes a speed penalty on it.<\/li>\n<li>While Python is great for a lot of things, it is weak in mobile computing, and in browsers.<\/li>\n<li>Being dynamically-typed, Python uses duck-typing (If it looks like a duck, it must be a duck). This can raise runtime errors.<\/li>\n<li>Python has underdeveloped database access layers. This renders it a less-than-perfect choice for huge database applications.<\/li>\n<li>And then, well, of course. Being easy makes it addictive. Once a Python-coder, always a Python coder.<\/li>\n<\/ol>\n<p>So while it has problems, it is also a wonderful tool for a lot of things. Refer to<strong> <a href=\"https:\/\/data-flair.training\/blogs\/advantages-and-disadvantages-of-python\/\">Python Advantages and Disadvantages<\/a>.<\/strong><\/p>\n<h2>3. Python Interview Questions for Experienced<\/h2>\n<p>These are the Advanced Python Interview Questions and Answers for Experienced, however they can also refer the basic Python Interview Questions and Answers for Freshers for basic knowledge.<\/p>\n<p><strong>Q.21. What does the function zip() do?<\/strong><\/p>\n<p>One of the less common functions with beginners, zip() returns an iterator of tuples.<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; list(zip(['a','b','c'],[1,2,3]))<\/pre>\n<p>[(&#8216;a&#8217;, 1), (&#8216;b&#8217;, 2), (&#8216;c&#8217;, 3)]<\/p>\n<p>Here, it pairs items from the two lists, and creates tuples with those. But it doesn\u2019t have to be lists.<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; list(zip(('a','b','c'),(1,2,3)))<\/pre>\n<p>[(&#8216;a&#8217;, 1), (&#8216;b&#8217;, 2), (&#8216;c&#8217;, 3)]<\/p>\n<p><strong>Q.22. If you are ever stuck in an infinite loop, how will you break out of it?<\/strong><\/p>\n<p>For this, we press Ctrl+C. This interrupts the execution. Let\u2019s create an infinite loop to demonstrate this.<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; def counterfunc(n):\r\n    while(n==7):print(n)\r\n&gt;&gt;&gt; counterfunc(7)<\/pre>\n<p>7<br \/>\n7<br \/>\n7<br \/>\n7<br \/>\n7<br \/>\n7<br \/>\n7<br \/>\n7<br \/>\n7<br \/>\n7<br \/>\n7<br \/>\n7<br \/>\n7<br \/>\n7<br \/>\n7<br \/>\n7<br \/>\n7<br \/>\n<em>Traceback (most recent call last):<\/em><br \/>\n<em>File &#8220;&lt;pyshell#332&gt;&#8221;, line 1, in &lt;module&gt;<\/em><br \/>\ncounterfunc<em>(7)<\/em><br \/>\n<em>File &#8220;&lt;pyshell#331&gt;&#8221;, line 2, in <\/em>counterfunc<br \/>\n<em>while(n==7):print(n)<\/em><br \/>\n<em>KeyboardInterrupt<\/em><\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt;<\/pre>\n<p>Any doubt yet in Python Advanced interview Questions? Please comment.<\/p>\n<p><strong>Q.23. Explain Python\u2019s parameter-passing mechanism.<\/strong><\/p>\n<p>To pass its parameters to a function, Python uses pass-by-reference. If you change a parameter within a function, the change reflects in the calling function. This is its default behavior. However, when we pass literal arguments like strings, numbers, or tuples, they pass by value. This is because they are immutable.<\/p>\n<p><strong>Q.24. With Python, how do you find out which directory you are currently in?<\/strong><\/p>\n<p>To find this, we use the function\/method getcwd(). We import it from the module os.<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; import os\r\n&gt;&gt;&gt; os.getcwd()<\/pre>\n<p>&#8216;C:\\\\Users\\\\lifei\\\\AppData\\\\Local\\\\Programs\\\\Python\\\\Python36-32&#8217;<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; type(os.getcwd)<\/pre>\n<p>&lt;class &#8216;builtin_function_or_method&#8217;&gt;<\/p>\n<p>We can also change the current working directory with chdir().<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; os.chdir('C:\\\\Users\\\\lifei\\\\Desktop')\r\n&gt;&gt;&gt; os.getcwd()<\/pre>\n<p>&#8216;C:\\\\Users\\\\lifei\\\\Desktop&#8217;<\/p>\n<p>For more on this, read up on <strong><a href=\"https:\/\/data-flair.training\/blogs\/python-directory\/\">Python Directory<\/a><\/strong>.<\/p>\n<p><strong>Q.25. How will you find, in a string, the first word that rhymes with \u2018cake\u2019?<\/strong><\/p>\n<p>For our purpose, we will use the function search(), and then use group() to get the output.<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; import re\r\n&gt;&gt;&gt; rhyme=re.search('.ake','I would make a cake, but I hate to bake')\r\n&gt;&gt;&gt; rhyme.group()<\/pre>\n<p>&#8216;make&#8217;<\/p>\n<p>And as we know, the function search() stops at the first match. Hence, we have our first rhyme to \u2018cake\u2019.<\/p>\n<p><strong>Q.26. How would you display a file\u2019s contents in reversed order?<\/strong><\/p>\n<p>Let\u2019s first get to the Desktop. We use the chdir() function\/method form the os module for this.<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; import os\r\n&gt;&gt;&gt; os.chdir('C:\\\\Users\\\\lifei\\\\Desktop')<\/pre>\n<p>The file we\u2019ll use for this is Today.txt, and it has the following contents:<br \/>\nOS, DBMS, DS, ADA<br \/>\nHTML, CSS, jQuery, JavaScript<br \/>\nPython, C++, Java<br \/>\nThis sem&#8217;s subjects<br \/>\nDebugger<br \/>\nitertools<br \/>\ncontainer<\/p>\n<p>Let\u2019s read the contents into a list, and then call reversed() on it:<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; for line in reversed(list(open('Today.txt'))):\r\n   print(line.rstrip())<\/pre>\n<p>container<br \/>\nitertools<br \/>\nDebugger<\/p>\n<p>This sem&#8217;s subjects<\/p>\n<p>Python, C++, Java<\/p>\n<p>HTML, CSS, jQuery, JavaScript<\/p>\n<p>OS, DBMS, DS, ADA<\/p>\n<p>Without the rstrip(), we would get blank lines between the output.<\/p>\n<p><strong>Q.27. What is Tkinter?<\/strong><\/p>\n<p><strong><a href=\"https:\/\/data-flair.training\/blogs\/python-gui-programming\/\">Tkinter is a famous Python library<\/a><\/strong> with which you can craft a GUI. It provides support for different GUI tools and widgets like buttons, labels, text boxes, radio buttons, and more. These tools and widgets have attributes like dimensions, colors, fonts, colors, and more.<\/p>\n<p>You can also import the tkinter module.<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; import tkinter\r\n&gt;&gt;&gt; top=tkinter.Tk()<\/pre>\n<p>This will create a new window for you:<\/p>\n<p>This creates a window with the title \u2018My Game\u2019. You can position your widgets on this.<\/p>\n<p><strong><a href=\"https:\/\/data-flair.training\/blogs\/python-library\/\">Follow this link to know more about Python Libraries<\/a><\/strong><\/p>\n<p><strong>Q.28. How is a .pyc file different from a .py file?<\/strong><\/p>\n<p>While both files hold bytecode, .pyc is the compiled version of a Python file. It has platform-independent bytecode. Hence, we can execute it on any platform that supports the .pyc format. Python automatically generates it to improve performance(in terms of load time, not speed).<\/p>\n<p><strong>Q.29. How do you create your own package in Python?<\/strong><\/p>\n<p>We know that a package may contain sub-packages and modules. A module is nothing but Python code.<\/p>\n<p>To create a package of our own, we create a <a href=\"https:\/\/data-flair.training\/blogs\/python-directory\/\">directory<\/a> and create a file __init__.py in it. We leave it empty. Then, in that package, we create a <a href=\"https:\/\/data-flair.training\/blogs\/python-modules\/\">module<\/a>(s) with whatever code we want. For a detailed explanation with pictures, refer to <a href=\"https:\/\/data-flair.training\/blogs\/python-packages\/\">Python Packages<\/a>.<\/p>\n<p><strong>Q.30. How do you calculate the length of a string?<\/strong><\/p>\n<p>This is simple. We call the function len() on the string we want to calculate the length of.<\/p>\n<pre class=\"EnlighterJSRAW\">&gt;&gt;&gt; len('Ayushi Sharma')<\/pre>\n<p>13<\/p>\n<h2>4. Conclusion<\/h2>\n<p>So here in <a href=\"https:\/\/www.python.org\/\">Python<\/a> interview questions and answers, we discussed some more questions. But hold on, this isn\u2019t all.<br \/>\nIf you have any query in Python Interview answers or questions, Please comment.<\/p>\n<p><strong><a href=\"https:\/\/data-flair.training\/blogs\/python-programming-interview-questions\/\">See you in Part III.<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>1. Python Interview Questions and Answers Welcome to our Python Interview Questions and answers series. Today, we will look at some more interview questions for Python, some basic to advanced interview questions to help&#46;&#46;&#46;<\/p>\n","protected":false},"author":5,"featured_media":26363,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[46],"tags":[279,1656,3467,10425,10493,10612,10825],"class_list":["post-10179","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-python","tag-advanced-python-questions-and-answers","tag-basic-python-interview-questions-and-answers","tag-data-structure-interview-questions","tag-python-coding-interview-questions","tag-python-developer-interview-questions","tag-python-interview-questions-and-answers","tag-python-scripting-interview-questions"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Top 30 Python Interview Questions and Answers - DataFlair<\/title>\n<meta name=\"description\" content=\"Python Interview Questions and answers for freshers and experienced. 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