标识符合法性检查。
1、字母或者下划线开始。
2、后面是字母、下划线或者数字。
3、检查长度大于等于1。
4、可以识别关键字。
python35 idcheck.py
idcheck.py
import string
import keyword
alphas = string.ascii_letters + '_'
nums = string.digits
keywords = keyword.kwlist
print ("Welcome to the Identifier Checker v1.1")
print ("Testees must be at least 1 char long.")
myInput = input('Identifier to test?')
if myInput not in keywords:
if len(myInput) >=
1:
1:
if myInput[0] not in alphas:
("Waring:first symbol must be alphas.")
else:
for
otherChar in myInput[1:]:
if otherChar not in alphas +
nums:
print ("Waring:other char must be
alphas||nums||_")
break
else:
print ("The " + myInput +" is
a identifier.")
else:
print ("The len fault.least 1.")
else:
print ("The " + myInput
+ " is a keyword.")
+ " is a keyword.")