import导入模块

├── __init__.py
├── __pycache__
│   ├── c1.cpython-38.pyc
│   └── c2.cpython-38.pyc
├── c1.py
├── c2.py
├── c4.py
└── t
    ├── __pycache__
    │   └── c3.cpython-38.pyc
    └── c3.py

.pyc: 是python编译的二进制字节码文件

同级模块如何调用?

c1.py

a = 1

c2.py

import c1
print(c1.a) # 1

import 只能导入模块

不同级模块调用 c3.py

a = 2

c4.py

import t.c3 as m # t命名空间
print(m.a)

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