A Python identifier is a name used for classify a function, variable, class, module or any other object. An identifier begins with a letter A to Z or a to z or an underscore (_) followed by zero or additional underscores, letters, and digits (0 to 9).
Python does not permit punctuation characters for example @, $, and % within identifiers. Python is a case sensitive programming language. Therefore Manpower and manpower are two unlike identifiers in Python.
Here are following identifier naming conference for Python:
• Class names start by an uppercase letter and all additional identifiers with a lowercase letter.
• Starting an identifier by a single leading underscore points to by conference that the identifier is meant to be private.
• Starting an identifier with two leading underscores points to a strongly private identifier.
• If the identifier as well ends with two trailing underscores, the identifier is a language-defined individual name.