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Below is the structure of my package:

my_package/
├── __init__.py
├── mod1.py
├── mod2.py
└── mod3.py

Below is the sample code of my package:

$ cat my_package/__init__.py
__all__ = ['mod1', 'mod2']
$ cat my_package/mod1.py
print("this is mod1")

class Mod1():
    def do1(self):
        print("do 1")

$ cat my_package/mod2.py
print("this is mod2")

class Mod2():
    def do2(self):
        print("do 2")

$ cat my_package/mod3.py
print("this is mod3")

class Mod3():
    def do3(self):
        print("do 3")

An error is reported when importing in the following way: AttributeError: 'module' object has no attribute 'mod1'

>>> import my_package
>>> my_do = my_package.mod1.Mod1()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'module' object has no attribute 'mod1'
>>>

I changed __init__.py to the following:

__all__ = ['mod1', 'mod2']
from my_package import *

No error was reported when importing in the following way：

>>> import my_package
this is mod1
this is mod2
>>> my_do = my_package.mod1.Mod1()
>>> my_do.do1()
do 1
>>>

So I think __all__ does not work, am I right? If not, what is the root case?

Gavin Hunter21
  • 13
  • 6

1 Answers1

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Looks like __init__.py just has no idea what mod1 and mod2 are. Python is an interpreted language so you’ll need to import the module(s) above __all__ in __init__.py for it to work as expected