I don't understand this result

[Ponomarenko Pavlo]

>>> f = [].extend(['spam', 32, 44])
>>> type(f)
         <class 'NoneType'>

[snippsat]

>>> f = [].extend(['spam', 32, 44])
>>> f
>>> repr(f)
'None'

You need to define a list fist,then extend it.

>>> lst = []
>>> lst.extend(['spam', 32, 44])
>>> lst
['spam', 32, 44]

[buran]

extend changes the list in place (and thus return None)

>>> f = [].extend(['spam', 32, 44])
>>> type(f)
<type 'NoneType'>
>>> f=[]
>>> f.extend(['spam', 32, 4])
>>> type(f)
<type 'list'>
>>> print f
['spam', 32, 4]

[Kebap]

>>> f = [] + ['spam', 32, 44]
>>> type(f)