How to check if a string is a valid keyword in Python?-Python Tutorial-php.cn

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

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Release： 2019-03-20 14:16:30

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In programming, keywords are the "reserved words" of the language, which convey special meanings to the interpreter. It can be a command or parameter. Keywords cannot be used as variable names in program sections.

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

#Keywords in Python: The Python language also retains some keywords that express special meanings. This knowledge is an essential part of learning the language. Below is a list of python keywords.

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,

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How to check whether a string is a keyword?

Python defines a built-in module "keyword" in its language, which handles certain keyword-related some operations. Function "iskeyword()" checks whether a string is a keyword. Returns true if the string is a keyword, false otherwise.

#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

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How to print a list of all keywords?

Sometimes, it can be difficult to remember all the keywords when assigning variable names. Therefore, a function "kwlist()" is provided in the "keyword" module, which prints all 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 : 
[&#39;False&#39;, &#39;None&#39;, &#39;True&#39;, &#39;and&#39;, &#39;as&#39;, &#39;assert&#39;, &#39;break&#39;, &#39;class&#39;, 
&#39;continue&#39;, &#39;def&#39;, &#39;del&#39;, &#39;elif&#39;, &#39;else&#39;, &#39;except&#39;, &#39;finally&#39;, 
&#39;for&#39;, &#39;from&#39;, &#39;global&#39;, &#39;if&#39;, &#39;import&#39;, &#39;in&#39;, &#39;is&#39;, &#39;lambda&#39;, 
&#39;nonlocal&#39;, &#39;not&#39;, &#39;or&#39;, &#39;pass&#39;, &#39;raise&#39;, &#39;return&#39;, 
&#39;try&#39;, &#39;while&#39;, &#39;with&#39;, &#39;yield&#39;]

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