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Python: How we can make a higher order function in Python?

+2 votes
Python: How we can make a higher order function in Python?
posted Dec 1, 2014 by Kali Mishra

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1 Answer

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Functions and methods are first-class objects in Python, so if you want to pass a function to another function, you can just treat it as any other object.

To bind a function object to a specific context, you can use either nested scopes or callable objects. For example, suppose you wanted to define linear(a,b) which returns a function f(x) that computes the value a*x+b.

Using nested scopes:

def linear(a, b):
    def result(x):
        return a*x + b
    return result

Or using a callable object:

class linear:
  def __init__(self, a, b):
           self.a, self.b = a,b
       def __call__(self, x):
           return self.a * x + self.b

In both cases:

taxes = linear(0.3, 2)

gives a callable object where taxes(10e6) == 0.3 * 10e6 + 2.

For More :

answer Mar 30, 2015 by Amit Kumar Pandey
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+2 votes

Iam on python 2.7 and linux .I need to know if we need to place the modules in a particular or it doesn't matter at all while writing the program.

For Example

import os
import shlex
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import time
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def main():
 """ ---MAIN--- """

if __name__ == '__main__':

In the above example :

I am guessing may be the python modules like os , shlex etc come first and later the user defined modules like import plaftform.cluster etc

Sorry if my question sounds dump , I was running pep8 and don't see its bothered much about it

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