About python underscore usage scenarios

Python provides multiple libraries for graphical development interfaces. This article will introduce you to the usage scenarios of python underline.

1. ##Leading single underscore

   _var

   pep 8, Convention,

   
   Usage scenario: Only Internal use, such as functions and variables used only within the class Note: wildcard import: from module import * will not import objects with a single leading underscore
   

2. Underscore at the end

   var_

   Usage scenario: The most appropriate name of a variable has been occupied by a keyword, and you still want to use it, you can append an underscore to solve the naming problem ConflictFor example:
   class_ ,id_

3. double leading underscore

   __var

   python The interpreter will rewrite the attribute name to avoid naming conflicts in subclasses, and rewrite it as:

   _classname__var. Simply put, just like private variables in c, it is completely transparent to subclasses and the outside. Not referenceable
   Usage scenarios: Generally an object is very important and does not want to be directly referenced by subclasses or external sources

4. Double leading and double trailing underscores

   __var__

   Python is reserved for special purposes,

   __init___, __call__, etc. is not recommended to use # in your own code

##Single underscore
5. _
   Usage scenario

   : Identifies a temporary or insignificant variable, often used in unpacking expressionsFor example: age is not important

   name_age_id = ('醉陌', '20', '21315271927')
   name, _, id_ = name_age_id

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