如何检查字符串是否是Python中的有效关键字？
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在编程中，关键字（keyword )是语言的“reserved word”，它向解释器传递特殊的含义。它可以是命令或参数。关键字不能在程序段中用作变量名。
Python中的关键字：Python语言还保留了一些表达特殊含义的关键字。这些知识是学习这门语言的必要部分。下面是python的关键字列表。
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,
如何检查字符串是否是关键字?
Python在其语言中定义了一个内置模块“keyword”，它处理与关键字相关的某些操作。函数“iskeyword()”检查字符串是否为关键字。如果字符串是关键字，则返回true，否则返回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")输出：
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
如何打印所有关键字的列表？
有时候，在分配变量名时，记住所有的关键字可能是比较困难。因此，在“keyword”模块中提供了一个函数“kwlist()”，它打印所有33个python关键字。
#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)输出：
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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