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- Introduction to Python for<\/em> loop<\/strong><\/li>\n\n\n\n
- Syntax of for <\/em>loop<\/strong><\/li>\n\n\n\n
- Examples of using for <\/em>loops<\/strong><\/li>\n<\/ul>\n\n\n\n
\n\n\n\nPython <\/em>For Loop<\/h2>\n\n\n\n
A control flow statement that enables the iteration over a sequence until all items in the sequence have been processed is called as for <\/em>loop. This allows you to execute a block of code for each item in the sequence. The iteration ends based on the completion of iterating through all the items in the sequence. The capabilities of the for <\/em>loop extends towards iterating a large number of entities such as string or lists or tuples.<\/p>\n\n\n\n
\n\n\n\nSyntax of For Loop<\/h2>\n\n\n\n
The for <\/em>loop can be coded using a couple of syntaxes, each given below.<\/p>\n\n\n\n
Syntax 1:<\/strong><\/p>\n\n\n
\nfor val1 in val2:\n <statement block>\n<\/pre><\/div>\n\n\n
Syntax 2:<\/strong><\/p>\n\n\n
\nfor val in range (<startvalue>, <endvalue>, <jumps>):\n <statement block>\n<\/pre><\/div>\n\n\n
The latter syntax harnesses the potential of the range <\/em>function which makes it easier to specify the boundaries within which the for <\/em>loop ought to operate. It also provides the flexibility for specifying the increments at which the iterations are to be executed. <\/p>\n\n\n\n
Syntax 3:<\/strong><\/p>\n\n\n
\nfor val1 in val2:\n\t\tfor val3 in val4:\n\t\t\t<statement block>\n <statement block>\n<\/pre><\/div>\n\n\n
Some might have guessed it by now. The above is the representation of the nested for <\/em>loop. These are iterations within iterations such that the result obtained by \u2018x\u2019 iterations of the innermost condition would then be fed as an input for the \u2018y\u2019 iterations of the outermost condition.<\/p>\n\n\n\n
\n\n\n\nExamples of using For Loop<\/h2>\n\n\n\n
This section shall detail the different variations in which the standard for <\/em>loop could be utilised in Python. Let us get started with how to use it with a list.<\/p>\n\n\n\n
Example 1:<\/strong><\/p>\n\n\n\n
Given below is a list, each of whose elements is to be incremented by one using the for <\/em>loop.<\/p>\n\n\n
\nar1 = [20, 57, -10, 89]\nfor i in ar1:\n print(i+1)\n<\/pre><\/div>\n\n\n
Output:<\/strong><\/p>\n\n\n\n
![\"Adding](\"https:\/\/codeforgeek.com\/wp-content\/uploads\/2023\/05\/Adding-using-for-loop-1.jpg\")
Adding using for <\/em>loop<\/figcaption><\/figure>\n\n\n\n Example 2:<\/strong><\/p>\n\n\n\n
Not only numbers but also strings can be iterated through for <\/em>loop. In the below code, let us have a look at how a list of string is iterated using a for <\/em>loop.<\/p>\n\n\n
\nsnacks = ["Samosa", "Chips", "Murukku"]\nfor i in snacks:\n print(i)\n<\/pre><\/div>\n\n\n
Output:<\/strong><\/p>\n\n\n\n
![\"Printing](\"https:\/\/codeforgeek.com\/wp-content\/uploads\/2023\/05\/Printing-elements-using-for-loop.jpg\")
Printing elements using for <\/em>loop<\/figcaption><\/figure>\n\n\n\n Example 3:<\/strong><\/p>\n\n\n\n
In both examples, we have mentioned \u2018i\u2019 <\/em>after for, <\/em>which represents each entity within the list that is to be put through the loop. Now let us have a look at how a for <\/em>loop and the range <\/em>function can be put to work together. The below code feeds the data within which the iteration is to be carried out using the range <\/em>function. It states that the data shall start from \u20181\u2019 and end at \u201890\u2019 in increments of \u201810\u2019.<\/p>\n\n\n
\nfor i in range(1,90,10):\n print(i\/2)\n<\/pre><\/div>\n\n\n
Output:<\/strong><\/p>\n\n\n\n
![\"Using](\"https:\/\/codeforgeek.com\/wp-content\/uploads\/2023\/05\/Using-for-loop-and-range-function.jpg\")
Using for <\/em>loop and range <\/em>function<\/figcaption><\/figure>\n\n\n\n Example 4:<\/strong><\/p>\n\n\n\n
Finally, let us get on with the workings of a nested for <\/em>loop through the below code. Here the numbers from the range specified in the first for <\/em>loop will be printed the same number of counts they stand for (i.e.) the number \u20182\u2019 gets printed 2 times & so on & so forth.<\/p>\n\n\n
\nfor i in range(2,9,2):\n for j in range(i):\n print(i, end = ' ')\n print()\n<\/pre><\/div>\n\n\n
Output:<\/strong><\/p>\n\n\n\n
![\"Nested](\"https:\/\/codeforgeek.com\/wp-content\/uploads\/2023\/05\/Nested-for-loop.jpg\")
Nested for <\/em>loop<\/figcaption><\/figure>\n\n\n\n
\n\n\n\nConclusion<\/h2>\n\n\n\n
Now that we have reached the end of this article, hope it has elaborated on the different variations in which for <\/em>loop can be put to use in Python. Here\u2019s another article that can be our definitive guide to the variables <\/em>in Python.<\/a> There are numerous other enjoyable and equally informative articles in CodeforGeek<\/a><\/em> that might be of great help for you to gain valuable insights. Until then, ciao!<\/em><\/p>\n\n\n\n
\n\n\n\nReference<\/h2>\n\n\n\n
- Syntax of for <\/em>loop<\/strong><\/li>\n\n\n\n