filters.py 文件源码

def do_int(value, default=0, base=10):
    """Convert the value into an integer. If the
    conversion doesn't work it will return ``0``. You can
    override this default using the first parameter. You
    can also override the default base (10) in the second
    parameter, which handles input with prefixes such as
    0b, 0o and 0x for bases 2, 8 and 16 respectively.
    The base is ignored for decimal numbers and non-string values.
    """
    try:
        if isinstance(value, string_types):
            return int(value, base)
        return int(value)
    except (TypeError, ValueError):
        # this quirk is necessary so that "42.23"|int gives 42.
        try:
            return int(float(value))
        except (TypeError, ValueError):
            return default