What's the naming convention in python for variable name already taken and occupied by system library

Question

Sometimes I need to use variable name like max, or len, but they are somehow occupied by the python library method. Should I instead just use _max or max_?

What is the conversion for these variable naming style?

make it more specific. if it's a maximum length, use maxlen or something like max_length. If it's the length of something, use length. Don't use weird underscores :P — hyperneutrino
– hyperneutrino, Commented Oct 27, 2017 at 0:16
underscores have implicit meaning in python, see hackernoon.com/… — 0TTT0
– 0TTT0, Commented Oct 27, 2017 at 0:19
The convention is to use a trailing underscore: max_ or len_ — juanpa.arrivillaga
– juanpa.arrivillaga, Commented Oct 27, 2017 at 0:24

Community · Accepted Answer · 2020-06-20 09:12:55Z

From pep8 official documentation:

single_trailing_underscore_: used by convention to avoid conflicts with Python keyword, e.g.

Tkinter.Toplevel(master, class_='ClassName')

Francisco · Accepted Answer · 2017-10-27 00:32:04Z

There's no such convention, at least not in PEP 8, what is mentioned in PEP 8 that may apply is the following:

If a function argument's name clashes with a reserved keyword, it is generally better to append a single trailing underscore rather than use an abbreviation or spelling corruption. Thus class_ is better than clss. (Perhaps better is to avoid such clashes by using a synonym.)

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