python判断变量名是否有效

变量名称不能是以下任何关键字: 'False', 'None', 'True', 'and', 'as', 'assert', 'async', 'await', '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'

def validate_variables_name():
    keywords=[ 'False', 'None', 'True', 'and', 'as', 'assert', 'async', 'await', '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']
    var=input('Enter a variable name: ')
    for c in var:
        if not( c.isdigit() or c=='_' or (c>='a' and c<='z')):
            print('This variable name is no valid')
            return
    if var in keywords or len(var)==0 or var[0].isdigit():
        print('This variable name is no valid')
    else:
        print('This variable name is valid')
validate_variables_name()

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