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How to check if a string is a valid keyword in Python?

  • Difficulty Level : Basic
  • Last Updated : 19 Feb, 2021

Defining a Keyword

In programming, a keyword is a “reserved word” by the language which convey a special meaning to the interpreter. It may be a command or a parameter. Keywords cannot be used as a variable name in the program snippet.

Keywords in Python:  Python language also reserves some of keywords that convey special meaning. Knowledge of these is necessary part of learning this language. Below is list of keywords registered by python .

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

How to check if a string is keyword?

Python in its language defines an inbuilt module “keyword” which handles certain operations related to keywords. A function “iskeyword()” checks if a string is keyword or not. Returns true if a string is keyword, else returns false.

#Instead of writing this massive Python code
#we can also code this in a different way
#Python code to demonstrate working of iskeyword()
# importing "keyword" for keyword operations
import keyword
import keyword
# initializing strings for testing while putting them in an array
keys = ["for", "while", "tanisha", "break", "sky",
"elif", "assert", "pulkit", "lambda", "else", "sakshar"]
for i in range(len(keys)):
     # checking which are keywords
    if keyword.iskeyword(keys[i]):
        print(keys[i] + " is python keyword")
        print(keys[i] + " is not a python keyword")


for is a python keyword
geeksforgeeks is not a python keyword
elif is a python keyword
elseif is not a python keyword
nikhil is not a python keyword
assert is a python keyword
shambhavi is not a python keyword
True is a python keyword
False is a python keyword
akshat is not a python keyword
akash is not a python keyword
break is a python keyword
ashty is not a python keyword
lambda is a python keyword
suman is not a python keyword
try is a python keyword
vaishnavi is not a python keyword

How to print list of all keywords

Sometimes, remembering all the keywords can be a difficult task while assigning variable names. Hence a function “kwlist()” is provided in “keyword” module which prints all the 33 python keywords.

#Python code to demonstrate working of iskeyword()
# importing "keyword" for keyword operations
import keyword
# printing all keywords at once using "kwlist()"
print ("The list of keywords is : ")
print (keyword.kwlist)


The list of keywords is : 
['False', 'None', 'True', 'and', 'as', 'assert', 'break', 'class', 
'continue', 'def', 'del', 'elif', 'else', 'except', 'finally', 
'for', 'from', 'global', 'if', 'import', 'in', 'is', 'lambda', 
'nonlocal', 'not', 'or', 'pass', 'raise', 'return', 
'try', 'while', 'with', 'yield']


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This article is contributed by Manjeet Singh(S.Nandini). If you like GeeksforGeeks and would like to contribute, you can also write an article using or mail your article to See your article appearing on the GeeksforGeeks main page and help other Geeks.

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