Solve the problem of error when importing module under PyCharm directory

In PyCharm2017, No model named... Error, but can actually run

This is because PyCharm does not automatically add the current file directory to source_path.

Right-click make_directory as-- in the current directory > Sources Root

python import module

Import b.py from a.py in the same directory as a.py

import b or from b import method/function

Import b.py under different directories in a.py

import sys

sys.path.append (' Absolute path to b module ')

import b