Mention some rules for Identifiers?

1.	Mention some rules for Identifiers?
Answer» 1. An identifier must start with an alphabet (A..Z or a..z) or underscore (_). 2. Identifiers may contain digits (0 .. 9) 3. Python identifiers are case sensitive i.e. uppercase and lowercase letters are distinct. 4. Identifiers must not be a python keyword. 5. Python does not allow punctuation character such as %,$, @ etc., within identifiers.

Answer»

1. An identifier must start with an alphabet (A..Z or a..z) or underscore (_).

2. Identifiers may contain digits (0 .. 9)

3. Python identifiers are case sensitive i.e. uppercase and lowercase letters are distinct.

4. Identifiers must not be a python keyword.

5. Python does not allow punctuation character such as %,$, @ etc., within identifiers.

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