How to call a function written by yourself in python

In python, in addition to calling the downloaded extension library, you can also customize functions to facilitate yourself.
Put the basic module in a fixed folder (or relative fixed folder) and use sys.append(r'custom module path')
The example is as follows:

1. In E: \pycharmCreate a new hello.py to implement the basic function function (define a hello() function)

2. Call the custom function

3. The running result is:

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