Function in Python is some reusable code, often executed with various parameters (so it is parametrized) and intended for better code style and usability.
Example of function declaration:
When you develop your code - you may decide to quickly declare functions before their code is available, so it will be "empty" declaration of function
| Empty function declaration def test_function(): pass |
When function consist of self sufficient code and does not require any arguments (parameters) to be passed into its code - you may have functions which does not accept any arguments.
| Function declaration and usage (call a function) - without arguments def test_function(): print("Hello World") test_function() |
Functions which do have arguments - are more common as it represents more flexible code style
| Function declaration and usage (call a function) - with arguments def test_function(word1, word2): print(word1 + " " + word2) test_function("Hello", "World") |
Functions may have unknown number of arguments - in this case code may iterate over all parameters as needed per logic
| Function declaration and usage - with unknown number of arguments def test_function(*parameters): for _ in parameters: print(_, end =" ") print("- all parameters were printed") test_function("Hello", "World") |
Functions may also receive their arguments in the form of "key = value" pairs. This way not only number of parameters may be unknown but also order of those arguments.
| Function declaration and usage - with unknown number of arguments by arbitrary declaration def test_function(**parameters): print(parameters["first_word"] + " " + parameters["second_word"]) test_function(second_word = "World", first_word = "Hello") |
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