Question

Write a Python program, which inputs an identifier/variable name from the user, decides if it is valid or invalid, and then prints out Valid or Invalid.
Rules for identifiers are as follows:
- Can only be a sequence of letters, digits, and underscores
- Must start with letter or underscore
- Must not match with Python key words (if, elif, True, False, and, or, as, for)


This is what I have so far, but am stuck at:

userInput = input("Name: ")

for x in userInput:
if x >= 'a' and x <= 'z':
continue
if x >= 'A' and x <= 'Z':
continue
if x >= '0' and x <= '9':
continue
if x == '_':
continue
else:
valid = false

Answer 1

Answer:

You can’t use reserved keywords as an identifier name.Python identifier can contain letters in a small case (a-z), upper case (A-Z), digits (0-9), and underscore (_).Identifier name can’t begin with a digit.Python identifier can’t contain only digits.Python identifier name can start with an underscore.There is no limit on the length of the identifier name.Python identifier names are case sensitive.