Python中包无法使用问题

change __init__.pyy to __init__.py.

确认 d:\ 路径有在以下的输出结果中

>>> import sys
>>> sys.path

如果没有, 你会得到 ModuleNotFoundError: No module named 'bag'

The first entry in the module search path is the directory that contains the input script, if there is one.

The PYTHONPATH environment variable is often used to add directories to the search path. If this environment variable is found then the contents are added to the module search path.

For WIN10,

WIN+R > sysdm.cpl > OK > Advanced > Environment Variables > System Variables > PYTHONPATH > Edit

['', 'C:\Program Files\Lib\idlelib', 'D:\bag', 'C:\Program Files\python39.zip', 'C:\Program Files\DLLs', 'C:\Program Files\lib', 'C:\Program Files', 'C:\Program Files\lib\site-packages']

你好，修改环境变量后仍显示错误。是不是得用pip 加载包，但我不会，请指教。

仍出现找不到模块的错误 Traceback (most recent call last): File "D:\bag\149-6.py", line 3, in from bag import time ModuleNotFoundError: No module named 'bag' 谢谢您了。

pycharm打开项目后 在pycharm里右键bag文件夹 选择一下 Mark Directory as 然后选 Sources Root 试一下

还是原来的错误提示，谢谢大家了。

If you run the script by python directly, not under PyCharm / VS Code / Virtual Environment or else.

C:\>python
Python 3.10.2 (tags/v3.10.2:a58ebcc, Jan 17 2022, 14:12:15) [MSC v.1929 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import sys
>>> sys.path
['', 'C:\\Software\\Python\\python39.zip', 'C:\\Software\\Python\\DLLs', 'C:\\Software\\Python\\lib', 'C:\\Software\\Python', 'C:\\Software\\Python\\lib\\site-packages', 'C:\\Software\\Python\\lib\\site-packages\\win32', 'C:\\Software\\Python\\lib\\site-packages\\win32\\lib', 'C:\\Software\\Python\\lib\\site-packages\\Pythonwin', 'D:\\Python\\Project\\OK', 'C:\\', 'C:\\Software\\Python\\python310.zip']
>>> from bag import time
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ModuleNotFoundError: No module named 'bag'
>>> sys.path.append("D:\\")
>>> sys.path
['', 'C:\\Software\\Python\\python39.zip', 'C:\\Software\\Python\\DLLs', 'C:\\Software\\Python\\lib', 'C:\\Software\\Python', 'C:\\Software\\Python\\lib\\site-packages', 'C:\\Software\\Python\\lib\\site-packages\\win32', 'C:\\Software\\Python\\lib\\site-packages\\win32\\lib', 'C:\\Software\\Python\\lib\\site-packages\\Pythonwin', 'D:\\Python\\Project\\OK', 'C:\\', 'C:\\Software\\Python\\python310.zip', 'D:\\']
>>> from bag import time
>>> time
<module 'bag.time' from 'D:\\bag\\time.py'>
>>> quit()

C:\>d:

d:\>cd bag

d:\bag>dir
 Volume in drive D is DATA
 Volume Serial Number is 627D-9CEA

 Directory of d:\bag

01/13/2023  09:45 PM    <DIR>          .
01/13/2023  09:45 PM    <DIR>          ..
01/13/2023  09:44 PM                38 time.py
01/13/2023  09:42 PM                 0 __init__.py
01/13/2023  09:45 PM    <DIR>          __pycache__
               2 File(s)             38 bytes
               3 Dir(s)  548,079,394,816 bytes free

d:\bag>type __init__.py

d:\bag>type time.py
def foo():
    print('Hello World !')