An example of using __format__ magic method in Python. #python #format

format-example.py

class Foo(object):
    
    def __init__(self, x):
        self._x = x

    def __format__(self, format_spec):
        return '<Foo x={0}>'.format(self._x)
    

foo = Foo(12)

# Pass "baz" as a format_spec
print 'This is a foo: {0:baz}'.format(foo)