'A convenience method which coerces the specified value to an integer.
If the value is an invalid literal for ``int``, a ``ValueError`` will
be raised.
>>> a = ConfigObj()
>>> a[\'a\'] = \'fish\'
>>> a.as_int(\'a\')
Traceback (most recent call last):
ValueError: invalid literal for int() with base 10: \'fish\'
>>> a[\'b\'] = \'1\'
>>> a.as_int(\'b\')
1
>>> a[\'b\'] = \'3.2\'
>>> a.as_int(\'b\')
Traceback (most recent call last):
ValueError: invalid literal for int() with base 10: \'3.2\''

def as_int(self, key):

    return int(self[key])
