{"id":9973,"date":"2023-11-05T09:47:01","date_gmt":"2023-11-05T04:17:01","guid":{"rendered":"https:\/\/python-programs.com\/?p=9973"},"modified":"2023-11-10T12:19:02","modified_gmt":"2023-11-10T06:49:02","slug":"python-interview-questions-on-decision-making-and-loops","status":"publish","type":"post","link":"https:\/\/python-programs.com\/python-interview-questions-on-decision-making-and-loops\/","title":{"rendered":"Python Interview Questions on Decision Making and Loops"},"content":{"rendered":"<p>We have compiled most frequently asked <a href=\"https:\/\/python-programs.com\/python-interview-questions\/\">Python Interview Questions<\/a> which will help you with different expertise levels.<\/p>\n<h2>Python Interview Questions on Decision Making and Loops<\/h2>\n<p><strong>Control Statements<\/strong><\/p>\n<p>Control statements are used to control the flow of program execution. They help in deciding the next steps under specific conditions also allow repetitions of the program a certain number of times.<br \/>\nTwo types of control statements are as follows:<\/p>\n<p>1. Conditional branching<\/p>\n<ul>\n<li>If<br \/>\nSyntax:<br \/>\nif (condition): to do statement<br \/>\nIf the condition evaluates to be true only then if code under if block will be executed.<\/li>\n<li>if. . .else Syntax:<br \/>\nif (condition): to do statement else:<br \/>\nto do statement<\/li>\n<li>Nested if statements Syntax:<br \/>\nif (condition1):<br \/>\nto dd statement elif(condition2):<br \/>\nelse do this<br \/>\nelif(condition3):<br \/>\nelse do this<\/li>\n<\/ul>\n<p>2. Loops<\/p>\n<ul>\n<li><strong>while:<\/strong> repeat a block of statements as long as a given condition is true<br \/>\nSyntax:<br \/>\nwhile(condition): ;<br \/>\nto do statement<\/li>\n<li><strong>for:<\/strong> repeat a block of statements for a certain number of times<br \/>\n, Syntax: &#8216;<br \/>\nfor &lt; iterating_variable &gt; in sequence:<br \/>\nRepeat these steps<\/li>\n<li>nested loops<\/li>\n<\/ul>\n<p>Question 1.<br \/>\nWhat would be the output for the following piece of code?<\/p>\n<pre>animals = [ 'cat', 'dog'] .\r\nfor pet in animals: .\r\npet.upper( ) \r\nprint(animals)<\/pre>\n<p>Answer:<br \/>\nThe output will be [\u2018cat\u2019, \u2018dog\u2019]. The value returned by a pet. upper( ) is not assigned to anything hence it does not update the value in any way.<\/p>\n<p>Question 2.<br \/>\nWhat would be the output of the following code?<\/p>\n<pre>for i in range(len(animals)):\r\nanimals[i] = animals[i].upper( ) \r\nprint(animals)<\/pre>\n<p>Answer:<\/p>\n<pre>[\u2018CAT\u2019, \u2018DOG\u2019]<\/pre>\n<p>Question 3.<br \/>\nWhat would be the output of the following code?<\/p>\n<pre>numbers = [1,2,3,4] \r\nfor i in numbers:\r\nnumbers.append(i + 1) \r\nprint(numbers)<\/pre>\n<p>Answer:<br \/>\nThis piece of code will not generate any output as the \u2018for\u2019 loop will never stop executing. In every iteration, one element is added to the end of the list and the list keeps growing in size.<\/p>\n<p>Question 4.<br \/>\nWhat will be the output for the following code?<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\">i = 6\r\nwhile True:\r\nif i%4 == 0:\r\nbreak\r\nprint(i)\r\ni -= 2<\/pre>\n<p>Answer:<br \/>\n6<\/p>\n<p>Question 5.<br \/>\nWrite a code to print the following pattern:<br \/>\n*<br \/>\n**<br \/>\n***<br \/>\n****<br \/>\nAnswer:<\/p>\n<pre>for i in range(1,5):\r\nprint(\"*\"*i)<\/pre>\n<p>Or<\/p>\n<pre>count = 1 \r\nwhile count &lt; 5:\r\nprint(*count) \r\ncount = count + 1<\/pre>\n<p>Question 6.<br \/>\nWrite code to produce the following pattern:<br \/>\n1<br \/>\n22<br \/>\n333<br \/>\n4444<br \/>\nAnswer:<br \/>\nThe code will be as follows:<\/p>\n<pre>count = 1 \r\nwhile count &lt; 5:\r\nprint(str(count)*count) \r\ncount = count + 1<\/pre>\n<p>Question 7.<br \/>\nWrite a code to generate the following pattern:<br \/>\n1<br \/>\n12<br \/>\n123<br \/>\n1234<br \/>\nAnswer:<br \/>\nThe code will be as follows:<\/p>\n<pre>count = 1 \r\nstring1 =' ' \r\nwhile count &lt; 5:\r\nfor i in range(1, count+1):\r\nstring1 = string1+str(i)\r\ncount = count + 1 \r\nprint(string1) \r\nstring1 =' '<\/pre>\n<p>Question 8.<br \/>\nWrite code to spell a word entered by the user.<br \/>\nAnswer:<br \/>\nThe code will be as follows:<\/p>\n<pre>word = input (\"Please enter a word : \") \r\nfor i in word: \r\nprint (i)<\/pre>\n<p><strong>Output<\/strong><br \/>\nPlease enter a word: Aeroplane<br \/>\nA<br \/>\ne<br \/>\nr<br \/>\n0<br \/>\nP<br \/>\nl<br \/>\na<br \/>\nn<br \/>\ne<\/p>\n<p>Question 9.<br \/>\nWrite code to reverse a string.<br \/>\nAnswer:<br \/>\nThe code:<\/p>\n<pre>string1 = \"AeRoPlAnE\" \r\ntemp = list (string1) \r\ncount = len(temp)-1 \r\nreverse_str=' ' \r\nwhile count&gt;=0:\r\nreverse_str = reverse_str + temp[count] \r\ncount = count-1 \r\nprint(reverse_str)<\/pre>\n<p><strong>Output<\/strong><\/p>\n<pre>EnAlPoReA<\/pre>\n<p>Statements to control a loop<br \/>\nThe following three statements can be used to control a loop:<\/p>\n<ol>\n<li><strong>break:<\/strong> breaks the execution of the loop and jumps to the next statement after the loop<\/li>\n<li><strong>continue:<\/strong> takes the control back to the top of the loop without executing the remaining statements<\/li>\n<li><strong>pass:<\/strong> does nothing<\/li>\n<\/ol>\n<p>Question 10.<br \/>\nWhat will be the output for the following code?<\/p>\n<pre>a = 0\r\nfor i in range(5): \r\na = a+1 \r\ncontinue \r\nprint(a)<\/pre>\n<p>Answer:<br \/>\n5<\/p>\n<p>Question 11.<br \/>\nWhat would be the output for the following code?<br \/>\nAnswer:<br \/>\nThe code:<\/p>\n<pre>for item in ('a','b','c','d'): \r\nprint (item) \r\nif item == 'c' : \r\nbreak \r\ncontinue\r\nprint (\"challenge to reach here\")<\/pre>\n<p>Question 12.<br \/>\nHow would you use a \u201cif \u201d statement to check whether an integer is even ?<br \/>\nAnswer:<br \/>\nCode<\/p>\n<pre>x = int(input(\"enter number : \")) \r\nif x%2 == 0:\r\nprint(\"You have entered an even number\")<\/pre>\n<p><strong>Output<\/strong><\/p>\n<pre>enter number: 6\r\nYou have entered an even number\r\n&gt;&gt;&gt;<\/pre>\n<p>Question 13.<br \/>\nHow would you use an\u00a0 \u201cif \u201d statement to check whether an integer is odd?<br \/>\nAnswer:<br \/>\nCode<\/p>\n<pre>x = int(input(\"enter number : \")) \r\nif x%2 != 0:\r\nprint(\"You have entered an odd number\")<\/pre>\n<p><strong>Output<\/strong><br \/>\nenter number: 11<br \/>\nYou have entered an odd number<\/p>\n<p>Question 14.<br \/>\nUse an if-else statement to check if a given number is even if yes then display that a message stating that the given number is even else print that the given number is odd.<br \/>\nAnswer:<br \/>\nPlease have a look at the following code:<br \/>\nCode<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\">x = int(input(\"enter number : \")) if x%2 == 0:\r\nprint(\"You have entered an even number\") else:\r\nprint(\"You have entered an odd number\")<\/pre>\n<p><strong>Output<\/strong><\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\">enter number: 11\r\nYou have entered an odd number\r\n&gt;&gt;&gt;\r\nenter number: 4\r\nYou have entered an even number\r\n&gt;&gt;&gt;<\/pre>\n<p>Question 15.<br \/>\nWhat is a ternary operator?<br \/>\nAnswer:<br \/>\nThe ternary operator is a conditional expression used to compress the if.. .else block in one single line.<\/p>\n<pre>[to do if true] if [Expression] else [to do if false]<\/pre>\n<p><strong>Code<\/strong><\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\">X = 27\r\nprint(\"You have entered an even number\") if x%2\r\n== 0 else print(\"You have entered an odd number\")<\/pre>\n<p><strong>Output<\/strong><\/p>\n<pre>You have entered an odd number<\/pre>\n<p>Question 16.<br \/>\nWhat would be the output of the following code? Why?<br \/>\ni = j = 10 if i &gt; j:<br \/>\nprint(&#8220;i is greater than j&#8221;) elif i&lt;= j:<br \/>\nprint(&#8220;i is smaller than j&#8221;) else:<br \/>\nprint(&#8220;both i and j are equal&#8221;)<br \/>\nAnswer:<br \/>\nThe output of the above code will be:<br \/>\ni is smaller than j<br \/>\ni is equal to j.<br \/>\nSo, the second condition elif i&gt;j evaluates to true and so, the message printed in this block is displayed.<\/p>\n<p>Question 17.<br \/>\nHow can the following piece of code be expressed in one single line?<br \/>\ni = j = 10 if i &gt; j :<br \/>\nprint(&#8220;i is greater than j&#8221;)<br \/>\nelif i&lt; j:<br \/>\nprint(&#8220;i is smaller than j&#8221;)<br \/>\nelse:<br \/>\nprint(&#8220;both i and j are equal&#8221;)<br \/>\nAnswer:<br \/>\nprint (\u201ci is greater than j\u201d if i &gt; j else \u201ci is smaller than j\u201d if i &lt; j else \u201cboth i and j are equal\u201d)<\/p>\n<p>Question 18.<br \/>\nWhat will be the output for the following code?<br \/>\ni = 2 j = 16<br \/>\nminimum_val = i &lt; j and i or j minimum_val<br \/>\nAnswer:<br \/>\n2<\/p>\n<p>Question 19.<br \/>\nWhat is the meaning of conditional branching?<br \/>\nAnswer:<br \/>\nDeciding whether certain sets of instructions must be executed or not based on the value of an expression is called conditional branching.<\/p>\n<p>Question 20.<br \/>\nWhat would be the output for the following code?<br \/>\na = 0<br \/>\nb = 9<br \/>\ni = [True,False] [a &gt; b]<br \/>\nprint(i)<br \/>\nAnswer:<br \/>\nThe answer would be \u201cTrue\u201d. This is another ternary syntax: [value_if_false, value_if_true][testcondition]<br \/>\nIn the above code a &lt; b, therefore the test condition is false. Hence, \u2018i\u2019 will be assigned the value of value_if_false which in this case is set to \u201cTrue\u201d.<\/p>\n<p>Question 21.<br \/>\nWhat is the difference between the continue and pass statement?<br \/>\nAnswer:<br \/>\npass does nothing whereas continue starts the next iteration of the loop.<\/p>\n<p><strong>Python Looping<\/strong><\/p>\n<p>Question 22.<br \/>\nWhat are the two major loop statements?<br \/>\nAnswer:<br \/>\nfor and while<\/p>\n<p>Question 23.<br \/>\nUnder what circumstances would you use a while statement rather than for?<br \/>\nAnswer:<br \/>\nThe while statement is used for simple repetitive looping and the for statement is used when one wishes to iterate through a list of items, such as database records, characters in a string, etc.<\/p>\n<p>Question 24.<br \/>\nWhat happens if you put an else statement after a block?<br \/>\nAnswer:<br \/>\nThe code in the else block is executed after the for loop completes, unless a break is encountered in the for loop execution, in which case the else block is not executed.<\/p>\n<p>Question 25.<br \/>\nExplain the use of break and continue in Python looping.<br \/>\nAnswer:<br \/>\nThe break statement stops the execution of the current loop, and transfers control to the next block. The continue statement ends the current block&#8217;s execution and jumps to the next iteration of the loop.<\/p>\n<p>Question 26.<br \/>\nWhen would you use a continue statement in a for loop?<br \/>\nAnswer:<br \/>\nWhen processing a particular item was complete; to move on to the next, without executing further processing in the block.<br \/>\nThe continued statement says, &#8220;I&#8217;m done processing this item, move on to the next item.&#8221;<\/p>\n<p>Question 27.<br \/>\nWhen would you use a break statement in a for loop?<br \/>\nAnswer:<br \/>\nWhen the loop has served its purpose. As an example, after finding the item in a list searched for, there is no need to keep looping. The break statement says, &#8220;I&#8217;m done in this loop; move on to the next block of code.&#8221;<\/p>\n<p>Question 28.<br \/>\nWhat is the structure of a for loop?<br \/>\nAnswer:<br \/>\nfor &lt;item&gt; in &lt;sequence&gt;:&#8230; The ellipsis represents a code block to be executed, once for each item in the sequence. Within the block, the item is available as the current item from the entire list.<\/p>\n<p>Question 29.<br \/>\nWhat is the structure of a while loop?<br \/>\nAnswer:<br \/>\nwhile &lt;condition&gt;:&#8230; The ellipsis represents a code block to be executed until the condition becomes false. The condition is an expression that is considered true unless it evaluates to 0, null or false.<\/p>\n<p>Question 30.<br \/>\nUse a for loop and illustrate how you would define and print the characters in a string out, one per line.<br \/>\nAnswer:<br \/>\nmy String = &#8220;I Love Python&#8221;<br \/>\nfor my Char in my String:<br \/>\nprint myChar<\/p>\n<p>Question 31.<br \/>\neven the string &#8220;I LoveQPython&#8221; uses a for loop and illustrates printing each character up to, but not including the Q.<br \/>\nAnswer:<br \/>\nmy String = &#8220;I Love Python&#8221;<br \/>\nfor my car in my String:<br \/>\nif my car = &#8216;Q&#8217;:<br \/>\nbreak<br \/>\nprint myChar<\/p>\n<p>Question 32.<br \/>\nGiven the string &#8220;I Love Python&#8221; print out each character except for the spaces, using a for a loop.<br \/>\nAnswer:<br \/>\nmy String = &#8220;I Love Python&#8221;<br \/>\nfor myChar in my String:<br \/>\nif myChar \u2014 &#8216; &#8216; ,<br \/>\ncontinue print myChar<\/p>\n<p>Question 33.<br \/>\nIllustrate how to execute a loop ten times.<br \/>\nAnswer:<br \/>\ni = 1<br \/>\nwhile i &lt; 10:<br \/>\ni+=1<\/p>\n<p>Question 34.<br \/>\nWhen using a while loop, a condition was encountered that made staying in the loop pointless, what statement is used to transfer control?<br \/>\nAnswer:<br \/>\nThe break statement is used to terminate the processing of the loop and move on to the next block of code.<\/p>\n<p>Question 35.<br \/>\nHow is execution in the while loop block abandoned, but the loop itself is not exited?<br \/>\nAnswer:<br \/>\nThe continue statement is used to terminate the processing of the block and move control to the next iteration of the loop.<\/p>\n<p>Question 36.<br \/>\nWhat is a looping use of the range( ) function?<br \/>\nAnswer:<br \/>\nThe range function is used to generate a sequence of numbers for iteration. For example range(5) returns the list [0,1, 2, 3, 4] This list could be used in a a loop.<\/p>\n<p>Question 37.<br \/>\nCan the else clause be used after a while loop? When is it executed? ,<br \/>\nAnswer:<br \/>\nYes. The else block is executed after the while condition becomes false, but not if the while loop is exited with a break statement.<\/p>\n<p>Question 38.<br \/>\nIllustrate how the range( ) and len( ) functions be used to iterate over the indices of a sequence?<br \/>\nAnswer:<br \/>\nmyltems = [T, &#8216;Love&#8217;, &#8216;Python&#8217;]<br \/>\nfor i in rangeden(myltems)):<br \/>\nprint i, myltems[i]<\/p>\n<p>Question 39.<br \/>\nHow is the body of a loop defined?<br \/>\nAnswer:<br \/>\nThe body of the loop is defined by indentation.<\/p>\n<p>Question 40.<br \/>\nHow are loops nested?<br \/>\nAnswer:<br \/>\nEver greater levels of indentation.<\/p>\n<p>Question 41.<br \/>\nIllustrate a nested loop that uses the following list IT, \u2018Love&#8217;, &#8216;Python&#8217;] and outputs each character on a separate line.<br \/>\nAnswer:<br \/>\nmyltems = [T, &#8216;Love\u2019, &#8216;Python&#8217;]<br \/>\nfor myWord in myltems:<br \/>\nfor myChar in myWord:<br \/>\nprint myChar<\/p>\n","protected":false},"excerpt":{"rendered":"<p>We have compiled most frequently asked Python Interview Questions which will help you with different expertise levels. Python Interview Questions on Decision Making and Loops Control Statements Control statements are used to control the flow of program execution. They help in deciding the next steps under specific conditions also allow repetitions of the program a &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/python-programs.com\/python-interview-questions-on-decision-making-and-loops\/\"> <span class=\"screen-reader-text\">Python Interview Questions on Decision Making and Loops<\/span> Read More &raquo;<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":"","jetpack_publicize_message":"","jetpack_is_tweetstorm":false,"jetpack_publicize_feature_enabled":true},"categories":[5],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v18.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Python Interview Questions on Decision Making and Loops - Python Programs<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/python-programs.com\/python-interview-questions-on-decision-making-and-loops\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Python Interview Questions on Decision Making and Loops - Python Programs\" \/>\n<meta property=\"og:description\" content=\"We have compiled most frequently asked Python Interview Questions which will help you with different expertise levels. 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Python Interview Questions on Decision Making and Loops Control Statements Control statements are used to control the flow of program execution. They help in deciding the next steps under specific conditions also allow repetitions of the program a &hellip; Python Interview Questions on Decision Making and Loops Read More &raquo;","og_url":"https:\/\/python-programs.com\/python-interview-questions-on-decision-making-and-loops\/","og_site_name":"Python Programs","article_publisher":"https:\/\/www.facebook.com\/btechgeeks","article_published_time":"2023-11-05T04:17:01+00:00","article_modified_time":"2023-11-10T06:49:02+00:00","twitter_card":"summary_large_image","twitter_creator":"@btech_geeks","twitter_site":"@btech_geeks","twitter_misc":{"Written by":"Prasanna","Est. reading time":"9 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Organization","@id":"https:\/\/python-programs.com\/#organization","name":"BTech Geeks","url":"https:\/\/python-programs.com\/","sameAs":["https:\/\/www.instagram.com\/btechgeeks\/","https:\/\/www.linkedin.com\/in\/btechgeeks","https:\/\/in.pinterest.com\/btechgeek\/","https:\/\/www.youtube.com\/channel\/UC9MlCqdJ3lKqz2p5114SDIg","https:\/\/www.facebook.com\/btechgeeks","https:\/\/twitter.com\/btech_geeks"],"logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/python-programs.com\/#\/schema\/logo\/image\/","url":"https:\/\/python-programs.com\/wp-content\/uploads\/2020\/11\/BTechGeeks.png","contentUrl":"https:\/\/python-programs.com\/wp-content\/uploads\/2020\/11\/BTechGeeks.png","width":350,"height":70,"caption":"BTech Geeks"},"image":{"@id":"https:\/\/python-programs.com\/#\/schema\/logo\/image\/"}},{"@type":"WebSite","@id":"https:\/\/python-programs.com\/#website","url":"https:\/\/python-programs.com\/","name":"Python Programs","description":"Python Programs with Examples, How To Guides on Python","publisher":{"@id":"https:\/\/python-programs.com\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/python-programs.com\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"en-US"},{"@type":"WebPage","@id":"https:\/\/python-programs.com\/python-interview-questions-on-decision-making-and-loops\/#webpage","url":"https:\/\/python-programs.com\/python-interview-questions-on-decision-making-and-loops\/","name":"Python Interview Questions on Decision Making and Loops - 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