'id' is a bad variable name in Python
id() is a fundamental built-in:
Help on built-in function
id(...) id(object) -> integer Return the identity of an object. This is guaranteed to be unique among simultaneously existing objects. (Hint: it's the object's memory address.)
In general, using variable names that eclipse a keyword or built-in function in any language is a bad idea, even if it is allowed.
In PEP 8 - Style Guide for Python Code, the following guidance appears in the section Descriptive: Naming Styles :
single_trailing_underscore_: used by convention to avoid conflicts with Python keyword, e.g.
So, to answer the question, an example that applies this guideline is:
id_ = 42
Including the trailing underscore in the variable name makes the intent clear (to those familiar with the guidance in PEP 8).