def prowerka(data):
    a = len(data)
    if a > 10 and data.isdigit and data.islower and data.isupper:            
        return True
    else:
        return False

In [1]: data = 'python'
In [2]: data.isdigit
Out[2]: <function isdigit>
In [3]: data.isdigit()
Out[3]: False

def prowerka(data):
    a = len(data)
    if a > 10:
        for i in data:
            if i.isupper() and i.islower() == True:                
                return "a"
            
        else:
            return False

def f(s, op):
    return any(op(i) for i in s)
def prowerka(passwd):
    return len(passwd) > 5 and f(passwd, str.islower) and f(passwd, str.upper)

[code python]password = ('a1213aafksfsads')[/code]

    return len(passwd) > 5 and f(passwd, str.islower) and f(passwd, str.isupper)