First, the reference module
Def: Use class (method), a function defined in another file data program like Python
- Referenced module position. usually
- Python2 ： "/Library/Python/2.7/site-packages/"
- Python3： “/usr/local/Cellar/python/3.7.1/Frameworks/Python.framework/Versions/3.7/lib/python3.7/”
- Can be viewed using sys module modules. code show as below
import sys
sys.modules['os'] # 查看 模块“os”的路径Second, the reference mechanism
Method 1:
import XXX; XXX.py is a python file- XXX.py introduced directly into the files of all content definitions.
Second way:
from XXX import yyy; XXX.py is a python file- Yyy defined XXX.py introduced directly into the file. yyy is the class (method), a function, data, etc.
Three
import XXXways: ; XXX is a directory- All content is introduced directly into the definition XXX directory.
Four
from XXX import yyyways: ; XXX is a directory- Introduced directly into the definition of XXX yyy directory. yyy is the class (method), a function, data, etc.
Five ways:
from XXX.zzz import yyy; XXX is a directory , and zzz is its subdirectories- Direct introduction yyy zzz subdirectory under the definition of XXX directory. yyy is the class (method), a function, data, etc.