>>> class MyData:

...     def __init__(self, data):

...         "Initialize MyData from a sequence"

...         self.data = data

...     

...     @classmethod

...     def fromfilename(cls, filename):

...         "Initialize MyData from a file"

...         data = open(filename).readlines()

...         return cls(data)

...     

...     @classmethod

...     def fromdict(cls, datadict):

...         "Initialize MyData from a dict's items"

...         return cls(datadict.items())

... 

>>> MyData([1, 2, 3]).data

[1, 2, 3]

>>> MyData.fromfilename("/tmp/foobar").data

['foo\n', 'bar\n', 'baz\n']

>>> MyData.fromdict({"spam": "ham"}).data

[('spam', 'ham')]

class MyData:

    def __init__(self, data):

        self.data = data

​

    @classmethod

    def fromfilename(cls, filename):

        data = open(filename).readlines()

        return cls(data)

​

    @classmethod

    def fromdict(cls, datadict):

        MyData([1, 2, 3]).data

        return cls(datadict.items())

​

​

print(MyData.fromfilename("file.txt").data)

​

print(MyData.fromdict({"spam": "ham"}).data)

​

# ** Output: **

#[‘Welcome Developer’]

#dict_items([(‘spam’, ‘ham’)])