Python function as a function argument

Question

Can a Python function be an argument of another function   Say   def myfunc anotherfunc  extraArgs         run anotherfunc and also pass the values from extraArgs to it     pass   So this is basically two questions    Is it allowed at all  And if it is  how do I use the function inside the other function  Would I need to use exec    eval   or something like that  Never needed to mess with them    BTW  extraArgs is a list tuple of anotherfunc s arguments

User · Answer

Yes  By including the function call in your input argument s  you can call two  or more  functions at once     For example   def anotherfunc inputarg1  inputarg2       pass def myfunc func   anotherfunc       print func   When you call myfunc  you do this   myfunc anotherfunc inputarg1  inputarg2     This will print the return value of anotherfunc    Hope this helps

User · Answer

Here s another way using  args  and also optionally     kwargs   def a x  y     print x  y  def b other  function   args    kwargs     function  args    kwargs    print other  b  world   a   hello    dude     Output  hello dude world   Note that function   args    kwargs have to be in that order and have to be the last arguments to the function calling the function

User · Answer

def x a       print a      return a  def y func to run  a       return func to run a   y x  1    That I think would be a more proper sample  Now what I wonder is if there is a way to code the function to use within the argument submission to another function  I believe there is in C    but in Python I am not sure

User · Answer

Sure  that is why python implements the following methods where the first parameter is a function    map function  iterable       - Apply function to every item of iterable and return a list of the results   filter function  iterable  - Construct a list from those elements  of iterable for which function returns true  reduce function     iterable  initializer   - Apply    function of two arguments    cumulatively to the items of    iterable  from left to right  so as to reduce the iterable to a single    value  lambdas

User · Answer

Functions in Python are first-class objects  But your function definition is a bit off   def myfunc anotherfunc  extraArgs  extraKwArgs     return anotherfunc  extraArgs    extraKwArgs

User · Answer

Decorators are very powerful in Python since it allows programmers to pass function as argument and can also define function inside another function   def decorator func         def insideFunction            print  This is inside function before execution           func         return insideFunction  def func        print  I am argument function    func obj   decorator func   func obj      Output   This is inside function before execution I am argument function

User · Answer

def x a       print a      return a  def y a       return a  y x 1

User · Answer

Yes  it s allowed  You use the function as you would any other  anotherfunc  extraArgs

User · Answer

Can a Python function be an argument   of another function    Yes   def myfunc anotherfunc  extraArgs       anotherfunc  extraArgs    To be more specific     with various arguments       gt  gt  gt  def x a b           print  param 1  s param 2  s   a b       gt  gt  gt  def y z t           z  t       gt  gt  gt  y x   hello   manuel    param 1 hello param 2 manuel  gt  gt  gt

User · Answer

Function inside function  we can use the function as parameter too    In other words  we can say an output of a function is also a reference for an object  see below how the output of inner function is referencing to the outside function like below     def out func a      def in func b          print a   b   b   3    return in func  obj   out func 1  print obj 5     the result will be    14       Hope this helps

[python] Python function as a function argument?

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