{"id":122868,"date":"2021-01-06T14:19:34","date_gmt":"2021-01-06T14:19:34","guid":{"rendered":"https:\/\/blog.finxter.com\/?p=20466"},"modified":"2021-01-06T14:19:34","modified_gmt":"2021-01-06T14:19:34","slug":"python-enumerate-a-simple-illustrated-guide-with-video","status":"publish","type":"post","link":"https:\/\/sickgaming.net\/blog\/2021\/01\/06\/python-enumerate-a-simple-illustrated-guide-with-video\/","title":{"rendered":"Python enumerate() \u2014 A Simple Illustrated Guide with Video"},"content":{"rendered":"

If you’re like me, you want to come to the heart of an issue fast. Here’s the 1-paragraph summary<\/strong> of the enumerate()<\/code> function—that’s all you need to know to get started using it:<\/p>\n

Python’s built-in<\/a> enumerate(iterable)<\/code> function allows you to loop over all elements in an iterable<\/code> and their associated counters.<\/strong> Formally, it takes an iterable<\/code> as an input argument and returns an iterable of tuples<\/strong> (i, x)<\/code>—one per iterable element x<\/code>. The first integer tuple value is the counter of the element x<\/code> in the iterable<\/code>, starting to count from 0. The second tuple value is a reference to the element x<\/code> itself. For example, enumerate(['a', 'b', 'c'])<\/code> returns an iterable (0, 'a'), (1, 'b'), (2, 'c')<\/code>. You can modify the default start index of the counter<\/strong> by setting the optional second integer argument<\/strong> enumerate(iterable, start<\/strong>)<\/code>. <\/p>\n

I’ve created a short visual guide into enumerate in the following graphic:<\/p>\n

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\"Python<\/figure>\n<\/div>\n

Usage Example<\/h2>\n

Learn by example! Here are some examples of how to use the enumerate()<\/code> built-in function<\/a>:<\/p>\n

fruits = ['apple', 'banana', 'cherry']\nfor counter, value in enumerate(fruits): print(counter, value) # OUTPUT:\n# 0 apple\n# 1 banana\n# 2 cherry\n<\/pre>\n
The enumerate(iterable, start)<\/code> function takes an optional second argument that is the start value of the counter.<\/p>\n
fruits = ['apple', 'banana', 'cherry']\nfor counter, value in enumerate(fruits, 42): print(counter, value) # OUTPUT:\n# 42 apple\n# 43 banana\n# 44 cherry<\/pre>\n
 You can use the enumerate function to create a list of tuples from an iterable where the first tuple value is the index of the element:<\/p>\n
fruits = ['apple', 'banana', 'cherry']\nfruits_with_indices = list(enumerate(fruits))\nprint(fruits_with_indices)\n# [(0, 'apple'), (1, 'banana'), (2, 'cherry')]\n<\/pre>\n
Video enumerate()<\/h2>\n
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