Python - Passing a function into another function

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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).

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)

Passing function as an argument in Python, 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). Passing a function as an argument to another function in Python Functions can be referenced. That gimme variable now points to the pop method on our numbers list. Note that we Functions can be passed into other functions. Functions, like any other object, can be passed as an argument to

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

Python - Passing a function into another function, I've been writing a few scripts which have code I wanted to refactor. The “issue” was that there was a function that was script specific, but the� Passing function as an argument in Python. A function can take multiple arguments, these arguments can be objects, variables (of same or different data types) and functions. Python functions are first class objects. In the example below, a function is assigned to a variable. This assignment doesn’t call the function.

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
    -------
    >>> def foo(a:Union[float, int], b:Union[float, int]):
    ...    '''The function to pass'''
    ...    print(a+b)
    >>> 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.

Python — pass a function to another function and run it (with args , In this video, we will consider how you can pass a function as an argument to another Duration: 9:27 Posted: Aug 3, 2017 Moreover, the above code shows the possibility of calling many other functions from a function itself. A program to print all the Armstrong numbers in a given range [a,b]: While doing the coding for this program, it could be very much clear with the concept of calling a function from another function. Now, quickly let’s implement it.

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

Functional Programming in Python: Passing Function as an , Here's a simple example of functional decomposition using two functions. Even though this is a pretty simple idea, in practice this example illustrates many very important Python concepts, including local and global variables along with parameter passing. Now we will look at another example that uses two functions. Blog / Exercises / Using a Python Function in Another Function Exercise Using a Function in Another Function Exercise: Define a function that will estimate your daily salary, based on your hourly wage. Then define a second function that estimates your monthly salary based on your daily salary.

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...

6.6. Functions can Call Other Functions — How to Think like a , Pass that snapshot into generate_power() . Return nth_power() . To put it another way, the closure “initializes” the number bar in nth_power() and then� passing variable from one function as argument to other functions can be done like this. define functions like this. def function1(): global a a=input("Enter any number\t") def function2(argument): print ("this is the entered number - ",argument) call the functions like this. function1() function2(a)

Python Inner Functions—What Are They Good For? – Real Python, Python implements the following method where the first parameter is a function − map(function, iterable, ) - Apply function to every item of� The Function which calls another Function is called Calling Function and function which is called by another Function is call Called Function. How Function execution works ? A stack data structure is used during the execution of the function calls. Whenever a function is invoked then the calling function is pushed into the stack and called function is executed.

How to pass Python function as a function argument?, def printme( str ): "This prints a passed string into this function" print str return execute it by calling it from another function or directly from the Python prompt. I am trying to pass the name of a function into another function as an argument but I get an error: "TypeError: 'str' object is not callable". Here is a simplified example of the problem: def do

Python - Functions, The passing of parameters and arguments in Python. Parameters are inside functions or procedures, while arguments are used in procedure calls, i.e. the To use another special term: A variadic function is a function of indefinite arity. Passing variables from 1 function to another while using tkinter ; Learning OOP FAIL (on passing variables) Difference between Runnable interface & Thread class? Converting a Shell script to a Python script ; Passing Variables to Other Pages ; Name and Zip Array ; Passing Variables between objects ; CodeCounter.py for Python ; Assure n is a number

Comments
  • functions are first-class objects in python. you can pass them around, include them in dicts, lists, etc. Just don't include the parenthesis after the function name. Example, for a function named myfunction: myfunction means the function itself, myfunction() means to call the function and get its return value instead.
  • And what if the function is a method on an object and uses a property of that object to do its work?
  • What if the functions I pass have a varying number of input arguments? Should I then use keyword arguments?
  • What if the two functions are in separate python files?
  • Yes. In the example above, the invoker function would then need to supply those arguments when calling the function.