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#1
April 27th, 2013, 08:13 PM
 Z.K.
Contributing User

Join Date: May 2009
Posts: 184
Time spent in forums: 1 Day 1 h 40 m 47 sec
Reputation Power: 28
Partial functions

I was going through a online interactive python tutorial and I came to the section on partial functions, but I don't really understand how it works. The function below looks simple, but the answer I come up with a calculator is 66 and not 60 which is the correct answer so I thought I would ask if someone could go through this code and tell me how it works.

Code:
```from functools import partial

def func(u,v,w,x):
return u*4 + v*3 + w*2 + x

p = partial(func,5,6,7)
print p(8)```

#2
April 27th, 2013, 09:06 PM
 b49P23TIvg
Contributing User

Join Date: Aug 2011
Posts: 4,115
Time spent in forums: 1 Month 3 Weeks 2 Days 3 h 56 sec
Reputation Power: 455
Of course we don't know which calculator buttons you pressed. Given that mp is the matrix product, 60 is the correct answer. (www.jsoftware.com)
Code:
```   5 6 7 8 mp 4 3 2 1
60
```

Maybe the partial is clearer with keyword arguments
Code:
```>>> p = partial(func,u=5,v=6,w=7)
>>> p(w=8)    # deliberate error
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: func() takes exactly 4 arguments (3 given)
>>> p(x=8)
60
>>> ```
__________________
[code]Code tags[/code] are essential for python code!

Last edited by b49P23TIvg : April 27th, 2013 at 09:11 PM.

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