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I learned all python objects can be classified “True” or “False”.

“”, [], {}, None are evaluated “False”.

def check(data):
    if(
        filter(unicode.uppercase, data) 
        and filter(unicode.lowercase, data)
    ):
        return True
    else:
        return False

str = "aaa"
print check(str)
>>False
str = "Aaa"
print check(str)
>>True