pyhton learning - package

• Package: folder has a __init__.py file
• Package: is a collection of several modules
  • # from import
  • # from glance.api import pickle
  • # from glance.api.policy import get
• Directly into the package
  • # import glance
• Introducing a package
  • This does not mean that the package contents are all below can be used
• Importing a package in the end what happened?
  • Equivalent to the implementation of this package the following __init__.py file
• Absolute imports
  • advantage:
    • Py in the implementation of a script, the script and the script and the same level of the module can only be written with absolute
  • Disadvantages:
    • 1. All import must next explain the relationship between a folder from the root directory
    • 2. If the current import package positional relationship between the imported files and packages sent on a change then all the __init__ file to do the appropriate adjustments
• Relative imports:
• advantage:
  • No need to repeatedly modify the path, as long as the relative positions of all the files in a package of folders and files are not changed does not need to be concerned about the current level of relations between the package and the file is executed
• Shortcoming
  • py file contains relatively imported can not be directly executed, must be placed in the package to be introduced only if the call can execute # import modules from the package, then we do not need to do anything, directly into the line
• import urllib
  • Error, indicating urllib a package can not be directly used resquest.py file
• url.request
  • from urllib import request # request correct import method