using self-developed modules

[snippsat]

Read my post again,you should not save in python folder and you still have the long path.
I make it simple and have python in this path C:\python37,as i show in install link.

In my first link ,see that i have added E:\\div_code to path,just a place i have my python files.
If i save selfwrittenmodule.py in E:\\div_code,it will work from anywhere in cmd or cmder as i use.

# selfwrittenmodule.py
def f1(x):
    x = x + 1
    return x

Now can i test dos not matter which folder i am in.

C:\Users\Tom
λ ptpython
>>> from selfwrittenmodule import f1

>>> f1(42)
43