{"id":75272,"date":"2020-01-16T10:39:31","date_gmt":"2020-01-16T05:09:31","guid":{"rendered":"https:\/\/techvidvan.com\/tutorials\/?p=75272"},"modified":"2020-01-16T10:39:31","modified_gmt":"2020-01-16T05:09:31","slug":"python-loops","status":"publish","type":"post","link":"https:\/\/techvidvan.com\/tutorials\/python-loops\/","title":{"rendered":"Python Loops – Learn one of the most powerful concepts in programming"},"content":{"rendered":"

Loops<\/strong> are one of the most powerful<\/strong> and basic concepts<\/strong> in programming. A loop can contain a set of statements<\/strong> that keeps on executing<\/strong> until a specific condition is reached<\/strong>.<\/p>\n

Today, we are going to learn about the loops that are available<\/strong> in Python. In Python loops, we will study For loop<\/strong>, while loop<\/strong>, nested loops<\/strong> and loop control statements<\/strong>.<\/p>\n

Python Loops<\/h3>\n

Let\u2019s suppose you have a task to do which is to be executed<\/strong> a thousand times.<\/p>\n

Here, programming languages provide us with the concept of loops<\/strong> which helps us execute some task n number of times<\/strong> where n can be any whole number. They are pretty useful<\/strong> and can be applied<\/strong> to various use cases.<\/p>\n

1. Python For in loop<\/h4>\n

For loop in Python is used to iterate over a sequence of items like list<\/strong>, tuple<\/strong>, set<\/strong>, dictionary<\/strong>, string<\/strong> or any other iterable objects<\/strong>.<\/p>\n

Syntax: <\/strong><\/p>\n

for item in sequence:\n    body of for loop<\/pre>\n
The Python for loop<\/strong> doesn\u2019t need indexing<\/strong> unlike other programming languages (C\/C++ or Java)<\/strong>. It works like an iterator<\/strong> and the item variable<\/strong> will contain an item from the sequence<\/strong> at each iteration.<\/p>\n
The for loop<\/strong> continues<\/strong> until we reach the end<\/strong> of the sequence.<\/p>\n
Flowchart of for loop in Python<\/strong>\"Flowchart<\/a><\/p>\n
Code:<\/strong><\/p>\n
for item in [1,2,3,4]:\n    print( item)<\/pre>\n
Output: <\/strong><\/p>\n
1
\n2
\n3
\n4<\/div>\n
a. The range() function<\/h5>\n
When using for loops<\/strong> in Python, the range()<\/strong> function is pretty useful to specify the number of times<\/strong> the loop is executed<\/strong>. It yields a sequence of numbers<\/strong> within a specified range<\/strong>.<\/p>\n
Syntax:<\/strong><\/p>\n
range(start, stop, step)<\/pre>\n