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Introduction to Python (by Ilan Schnell) |
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Introduction to Python (by Ilan Schnell) |
Lets take a look at a simple function:
>>> def sum(x, y):
... return x+y
...
>>> sum(5, 3)
8
>>> sum('a', 'bc')
'abc'
>>> sum('a', 5)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "<stdin>", line 2, in sum
TypeError: cannot concatenate 'str' and 'int' objects
What if the function should handle this case as well?
>>> from types import *
>>> def sum(x, y):
... if type(x)==StringType and type(y)==IntType:
... return x+str(y)
... return x+y
...
>>> sum('a', 5)
'a5'
>>> sum('Hello ', 'World!')
'Hello World!'
>>> sum(1100, 325)
1425