Python package Creation (__init__.py)

Tag: INI code mod call LNL cannot module Python3 nbsp

How to make a package of your own:
First, you need to create a folder, use it as Top-level package, within this folder we can define the various subdocuments
folder with a. py file as individual sub-packages and modules
Note:Under each package folder, you need to have a __init__.pyFile, this file can be empty for example: we create a folder test as the top-level Package folder, add __init__.py in test top.py

[[email protected] pythoncode]$ ls test__init__.py  __pycache__  top.py[[email protected] test]$ cat top.py def Top ():    print ("top!")    Return

Next, we create a test.py file at the same directory level as test and import the test package into it
and reference the function top in the module top contained in the test package

[[email protected] pythoncode]$ cat test.py import TestTest.Top.top () Execute test.py This file, what will we see? is the output "top!"? [Email protected] pythoncode]$ Python3 test.py Traceback (most recent call last):  File ' test.py ', line 2, in <modu Le>    Test.Top.top () attributeerror:module ' Test ' has no attribute ' Top '

We see the above output, suggesting that the module top is not found in Test, what is this for?
The problem is on the __init__.py file, let me take a look at the __init__.py file

[email protected] test]$ cat __init__.py

This is a Empty File。 As we said earlier, each package file needs to contain a __init__.py file, only
There it is, this a folder can be recognized as a package, otherwise it is just a folder。
And in the above error message we see that the error in the second line, proof Test This package was successfully imported, but
The second line went wrong, and I couldn't find the Top module in Test .。 But we've put the top.py file in test.
Why can't I find it in this folder? The reason is still on the __init__.py file. Although the Test is in
__init__.py file, but just so we can only make Test be recognized as a package, and cannot reference
the Internal module。 We need Import the Top module first in the __init__.py fileTo import the test package externally
When using these modules, let's modify the __init__.py file and then execute test.py to see the results:

[Email protected] test]$ vim __init__.py [[email protected] test]$ cat __init__.py from Test import top[[email protected] test]$ CD. /[[email protected] pythoncode]$ python3 test.py top!

As we have imagined, the output of "top!"

Python package Creation (__init__.py)