Python Identifiers and Keywords

Here we’ll discuss Python Identifiers and Keywords.

Python Identifiers

A Python identifier is a name used to identify a class, variable, module, function, or any other object. It helps to differentiate one entity from another. Python does not allow punctuation characters within identifiers. Python is a case-sensitive programming language. Thus, Python and python are two different identifiers.

Rules for Python Identifiers:

Python identifier names are case sensitive.
An identifier starts with a letter A to Z or a to z.
You can’t use reserved keywords as an identifier name.
Identifier name can’t start with a digit.
Python identifier name can start with an underscore.
There is no limit on the length of the identifier name.
Can’t use the special character as an identifier in python.
Creating an identifier, starting with two leading underscores indicates a strongly private identifier.

Python Valid Identifiers Examples:

Here are some valid identifiers examples,

xyz890 = Identifier containing numbers and alphabets.
_ijk = Identifier can start with an underscore.
mno_45 = Identifier containing all the valid characters.

Python Invalid Identifiers Examples:

Here are some invalid identifiers examples,

45467 = Identifier can’t be only digits.
not = It’s a reserved keyword.
a-b = The only special character allowed is an underscore.
89abd = Identifier can’t start with a number.

Python Keywords:

The python programming keywords are saved or reserved words. These words can’t be utilized as the work title, variable title, and any identifier title, etc. Each keyword incorporates a particular meaning. Essentially, python programming keywords are utilized to characterize the sentence structure and structure of the Python language.

Here are some keywords used in python,

False	async	else	as	True	and
assert	elif	del	global	not	with
await	if	import	def	class	continue
pass	or	None	from	finally	for
break	yield	in	nonlocal	is	lambda
except	and	raise	while	return	try