Example analysis of partial usage of partial function in Python

The examples in this paper describe the partial usage of partial functions in Python. Share to everyone for your reference. Specific as follows:

When the function is executed, it is called with all the necessary parameters. However, sometimes parameters can be learned in advance of the function being called. In this case, a function has one or more parameters that can be used in advance so that the function can be called with fewer parameters.

For example:

In [9]: from functools import Partialin [ten]: def add (A, B): ....: return a+b....:in [one]: Add (4,3) out[11]: 7In []: plus = Partial (add,100) in [+]: Plus (9) out[13]: 109In []: Plus2 = partial (add,99) in []: Plus2 (9) out[15]: 108

In fact, when the function is called, there are a number of parameter parameters, but one of the parameters has been known, we can use this parameter to rebind a new function, and then to call this new function.

If there are default parameters, they can also automatically correspond, for example:

in [+]: def add2 (a,b,c=2): ....: return a+b+c....:in []: Plus3 = Partail (add,101)------------------------------------ ---------------------------------------Nameerror Traceback (most recent)/users/yupeng/documents/phantomjs /in
 
   
  
   
    
   ()----> 1 PLUS3 = Partail (add,101) nameerror:name ' partail ' are not Definedin [+]: Plus 3 = partial (ADD,101) in []: Plus3 (1) out[20]: 102In [+]: Plus3 = partial (ADD2,101) in []: Plus3 = partial (add2,101) (1) O UT[22]: 104In [+]: Plus3 (1) out[23]: 104In []: Plus3 (out[24): 104In []: Plus3 (1,3) out[25]: 105In []: Plus3 (1,30) OUT[26]:
  
   
 
  

Hopefully this article will help you with Python programming.

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