{"id":295,"date":"2019-06-26T08:55:24","date_gmt":"2019-06-26T08:55:24","guid":{"rendered":"http:\/\/askpython.com\/?p=295"},"modified":"2022-07-12T16:35:45","modified_gmt":"2022-07-12T16:35:45","slug":"python-pass-statement-keyword","status":"publish","type":"post","link":"https:\/\/www.askpython.com\/python\/python-pass-statement-keyword","title":{"rendered":"Python pass Statement – pass Keyword in Python"},"content":{"rendered":"\n

Python pass statement is a no-operation statement. It’s used to create empty code blocks and empty functions.<\/p>\n\n\n\n

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Python pass Statement Examples<\/h2>\n\n\n\n

Let’s look at some examples of Python pass statements.<\/p>\n\n\n\n

1. pass statement in a code block<\/h3>\n\n\n\n

Let’s say we have to write a function<\/a> to remove all the even numbers from a list<\/a>. In this case, we will use for loop to traverse through the numbers in the list. <\/p>\n\n\n\n

If the number is divided by 2, then we do nothing. Else, we add it to a temporary list. Finally, return the temporary list having only odd numbers to the caller.<\/p>\n\n\n\n

Python doesn’t support empty code blocks. So we can use the pass statement here for the no-operation in the if-condition block.<\/p>\n\n\n

\ndef remove_evens(list_numbers):\n    list_odds = []\n    for i in list_numbers:\n        if i % 2 == 0:\n            pass\n        else:\n            list_odds.append(i)\n    return list_odds\n\n\nl_numbers = [1, 2, 3, 4, 5, 6]\nl_odds = remove_evens(l_numbers)\nprint(l_odds)\n<\/pre><\/div>\n\n\n
Output<\/strong>: [1, 3, 5]<\/p>\n\n\n\n
Here we don’t need any operation in the if-condition block. So we have used the pass statement for the no-operation.<\/p>\n\n\n\n
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2. pass statement for an empty function<\/h3>\n\n\n\n
Python doesn’t have the concept of abstract functions. If we have to define an empty function, we can’t write it like this.<\/p>\n\n\n
\ndef foo():\n    # TODO - implement later\n<\/pre><\/div>\n\n\n
Output<\/strong>: IndentationError<\/a>: expected an indented block<\/p>\n\n\n\n
We can use a pass statement to define an empty function<\/a>. The function will have a statement but it won’t do anything.<\/p>\n\n\n
\ndef foo():\n    pass\n<\/pre><\/div>\n\n\n
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Can we have multiple pass statements in a function?<\/h2>\n\n\n\n
Yes, we can have multiple pass statements in a function or a code block. It’s because the pass statement doesn’t terminate the function. Its only work is to provide an empty statement.<\/p>\n\n\n
\ndef bar():\n    pass\n    print('bar')\n    pass\n\n\nif True:\n    pass\n    pass\n    print('True')\nelse:\n    print('False')\n    pass\n    pass\n<\/pre><\/div>\n\n\n
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Why do we need a pass statement?<\/h2>\n\n\n\n