Like every programming language, Python also have keywords(Reserved Words). you can not use them as a variable name or any other identifier name.

Python Keywords List

Python Keywords are used to perform an internal operation. All the keywords of Python contain lower-case letters only.

"and"    "assert"    "in"    "del"    "else"    "raise"    "from"    "if"    "continue"    "not"   
"pass"    "finally"    "while"    "yield"    "is"    "as"    "break"    "return"    "elif"    "except"   
"def"    "global"    "import"    "for"    "or"    "print"    "lambda"    "with"    "class"    "try"    "exec"