1# ticket: 480
2
3def f(x):
4    return x
5
6def len_f(x):
7    """
8    >>> len_f([1,2,3])
9    3
10    """
11    return len(f(x))
12
13def float_len_f(x):
14    """
15    >>> float_len_f([1,2,3])
16    3.0
17    """
18    return float(len(f(x)))
19
20def cast_len_f(x):
21    """
22    >>> cast_len_f([1,2,3])
23    3.0
24    """
25    return <double>len(f(x))
26