How to check if a string is a valid keyword in Python?
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.
#Python code to demonstrate working of iskeyword() # importing "keyword" for keyword operations import keyword # initializing strings for testing s = "for"s1 = "geeksforgeeks"s2 = "elif"s3 = "elseif"s4 = "nikhil"s5 = "assert"s6 = "shambhavi"s7 = "True"s8 = "False"s9 = "akshat"s10 = "akash"s11 = "break"s12 = "ashty"s13 = "lambda"s14 = "suman"s15 = "try"s16 = "vaishnavi" # checking which are keywords if keyword.iskeyword(s): print ( s + " is a python keyword") else : print ( s + " is not a python keyword") if keyword.iskeyword(s1): print ( s1 + " is a python keyword") else : print ( s1 + " is not a python keyword") if keyword.iskeyword(s2): print ( s2 + " is a python keyword") else : print ( s2 + " is not a python keyword") if keyword.iskeyword(s3): print ( s3 + " is a python keyword") else : print ( s3 + " is not a python keyword") if keyword.iskeyword(s4): print ( s4 + " is a python keyword") else : print ( s4 + " is not a python keyword") if keyword.iskeyword(s5): print ( s5 + " is a python keyword") else : print ( s5 + " is not a python keyword") if keyword.iskeyword(s6): print ( s6 + " is a python keyword") else : print ( s6 + " is not a python keyword") if keyword.iskeyword(s7): print ( s7 + " is a python keyword") else : print ( s7 + " is not a python keyword") if keyword.iskeyword(s8): print ( s8 + " is a python keyword") else : print ( s8 + " is not a python keyword") if keyword.iskeyword(s9): print ( s9 + " is a python keyword") else : print ( s9 + " is not a python keyword") if keyword.iskeyword(s10): print ( s10 + " is a python keyword") else : print ( s10 + " is not a python keyword") if keyword.iskeyword(s11): print ( s11 + " is a python keyword") else : print ( s11 + " is not a python keyword") if keyword.iskeyword(s12): print ( s12 + " is a python keyword") else : print ( s12 + " is not a python keyword") if keyword.iskeyword(s13): print ( s13 + " is a python keyword") else : print ( s13 + " is not a python keyword") if keyword.iskeyword(s14): print ( s14 + " is a python keyword") else : print ( s14 + " is not a python keyword") if keyword.iskeyword(s15): print ( s15 + " is a python keyword") else : print ( s15 + " is not a python keyword") if keyword.iskeyword(s16): print ( s16 + " is a python keyword") else : print ( s16 + " is not a python keyword") |
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Output:
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) |
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Output:
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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