#Python mogrify

gistfile1.txt

Python 2.5.1 (r251:54863, Feb  6 2009, 19:02:12) 
[GCC 4.0.1 (Apple Inc. build 5465)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> def mogrify(li):
...     for i, v in enumerate(li):
...             li[i] = v * 2
... 
>>> x = [1,2,3]
>>> id(x)
445976
>>> mogrify(x)
>>> x
[2, 4, 6]
>>> id(x)
445976
>>> def pure(li):
...     # List comprehension is consice and fun!
...     return [v * 2 for v in li]
... 
>>> y = pure(x)
>>> y
[4, 8, 12]
>>> id(y)
476184
>>> def mogrifyint(num):
...     num = 42
... 
>>> z = 5
>>> mogrifyint(z)
>>> z
5