Python - Passing a function into another function

Question

I am solving a puzzle using python and depending on which puzzle I am solving I will have to use a special set of rules  How can I pass a function into another function in Python   Example  def Game listA  listB  rules      if rules    True        do       else        do     def Rule1 v     if  variable name1  in v        return False   elif  variable name2  in v        return False   else        return True  def Rule2 v     if  variable name3  and  variable name4  in v        return False   elif  variable name4  and variable name1 in v        return False   else        return True   This is just a pseudo code and therefore not specific but I get the code to compile but I need to know how to call the function Game and whether it s correctly defined since rules will be switched for either Rule1 v  or Rule2 v

User · Answer

Treat function as variable in your program so you can just pass them to other functions easily   def test        print  test was invoked   def invoker func      func    invoker test     prints test was invoked

User · Answer

A function name can become a variable name  and thus be passed as an argument  by dropping the parentheses  A variable name can become a function name by adding the parentheses   In your example  equate the variable rules to one of your functions  leaving off the parentheses and the mention of the argument  Then in your game   function  invoke rules  v   with the parentheses and the v parameter   if puzzle    type1      rules   Rule1 else      rules   Rule2  def Game listA  listB  rules       if rules  v      True          do        else          do

User · Answer

Just pass it in like any other parameter   def a x       return  a  s      x    def b f x       return f x   print b a 10

User · Answer

For passing both a function  and any arguments to the function   from typing import Callable      def looper fn  Callable  n int   args    kwargs               Call a function  n  times      Parameters     ----------     fn  Callable         Function to be called      n  int         Number of times to call  func        args         Positional arguments to be passed to  func         kwargs         Keyword arguments to be passed to  func        Example     -------      gt  gt  gt  def foo a Union float  int   b Union float  int                  The function to pass               print a b       gt  gt  gt  looper foo  3  2  b 4      6     6     6                    for i in range n           fn  args    kwargs    Depending on what you are doing  it could make sense to define a decorator  or perhaps use functools partial

User · Answer

Just pass it in  like this   Game list a  list b  Rule1    and then your Game function could look something like this  still pseudocode    def Game listA  listB  rules None       if rules            do something useful                       result   rules variable    this is how you can call your rule     else            do something useful without rules

[python] Python - Passing a function into another function

Examples related to python

Examples related to function

Examples related to first-class-functions