Python 包的制作（__init__.py）

[wangml@iZwz976helaylvgqok97prZ pythoncode]$ ls Test
__init__.py  __pycache__  Top.py
[wangml@iZwz976helaylvgqok97prZ Test]$ cat Top.py 
def top():
    print("Top!")
    return

[wangml@iZwz976helaylvgqok97prZ pythoncode]$ cat Test.py 
import Test
Test.Top.top()
执行Test.py这个文件，我们会看到什么呢？是输出 "Top!" 吗？
[wangml@iZwz976helaylvgqok97prZ pythoncode]$ python3 Test.py 
Traceback (most recent call last):
  File "Test.py", line 2, in <module>
    Test.Top.top()
AttributeError: module ‘Test‘ has no attribute ‘Top‘

[wangml@iZwz976helaylvgqok97prZ Test]$ cat __init__.py

[wangml@iZwz976helaylvgqok97prZ Test]$ vim __init__.py 
[wangml@iZwz976helaylvgqok97prZ Test]$ cat __init__.py 
from Test import Top
[wangml@iZwz976helaylvgqok97prZ Test]$ cd ../
[wangml@iZwz976helaylvgqok97prZ pythoncode]$ python3 Test.py 
Top!