How to call a function in python

How to call a function in python: first define a function and save it as a ".py" file; then set a custom path; finally, call the file name of the custom function ".py" through the import statement to use it this function.

#Python calling functions vary depending on the type of the function. Generally, the calling time is slightly different. Please refer to the following content for details.

1. Built-in functions directly call

Built-in functions are generally provided in the form of built-in functions because they are frequently used or are meta-operations. This function can be called directly. The figure below shows the execution of the abs() function in the exchange environment.

2. Custom functions need to be defined before calling

Define a function named hello, whose function is to output hello world

First call the sys library, set the custom path, then call the file name of the custom function hello.py, and then call the hello() function

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