What is the meaning of single and double underscore before an object name?

What is the meaning of single and double underscore before an object name?

python oop naming-conventions identifier

python

What is the naming convention in Python for variable and function names?

python variables function naming-conventions

python

What is the purpose of the single underscore "_" variable in Python?

python variables naming-conventions metasyntactic-variable

python

Should I use "camel case" or underscores in Python? [duplicate]

python naming-conventions pep8

python

Python name mangling

python naming-conventions

python

Python naming conventions for modules

python naming-conventions

python

Why does Pylint object to single-character variable names?

python pylint naming-conventions

python

python: naming a module that has a two-word name

python naming-conventions

python

How do you PEP 8-name a class whose name is an acronym?

python coding-style naming-conventions

python

Underscore _ as variable name in Python [duplicate]

python variables naming-conventions metasyntactic-variable

python

Association between naming classes and naming their files in python (convention?)

python naming-conventions filenames classname

python

What does "rc" in matplotlib's rcParams stand for? [closed]

python matplotlib configuration naming-conventions configuration-files

python

Python package name conventions

python naming-conventions namespaces packages

python

Python Naming Conventions for Dictionaries/Maps/Hashes

python dictionary naming-conventions mapping

python

Are classes in Python in different files?

python class naming-conventions

python