CODEWITHSUNDEEP
functionpython-3.6
i_am_hal
i_am_hal

Reputation: 3

Delaying function calling - Python

so I'm amateur programmer, and I wanted to do something with functions for a little text-based hacking game. In it, a function would be called to allow the player to find the loot and so forth. So I was doing some 'small-scale testing'; And during my testing, I found that if I had a function (which called a different function inside of it), then some text being 'printed', the second function would be called first.

#Example using a sort of 'Decorator'.
def Decor(func):
    print("================")
    print("Hey there")
    print("================")
    print("")
    func

def Hello():
    print("And HELLO WORLD!")

decorated = Decor(Hello())
decorated

But the output is always something along the lines of:

And HELLO WORLD!
================
Hey there
================

Is there a way to make the function be called after the text is printed? Or simply delay the function being called. Or am I going about this the wrong way? Thanks for you time.

Upvotes: 0

Views: 84

Answers (2)

hiro protagonist
hiro protagonist

Reputation: 46849

this is one of the usual approaches to decorate a function in python:

def Decor(func):
    def new_func():
        print("================")
        print("Hey there")
        print("================")
        print("")
        func()
    return new_func

def Hello():
    print("And HELLO WORLD!")

decorated = Decor(Hello)
decorated()

this way the statements in your Decor and Hello functions are not called until you call decorated().

you could use the decorator also this way:

@Decor
def Hello():
    print("And HELLO WORLD!")

Hello()  # is now the decorated version.

there is a primer on decorators on realpython.com that might help.

Upvotes: 0

Malik
Malik

Reputation: 3802

The issue here is that you are passing the result of Hello() to Decor. This means that Hello() will be processed first and then the result will be passed to Decor as parameter. What you need is something like this

def Decor(func):
    print("================")
    print("Hey there")
    print("================")
    print("")
    func()

def Hello():
    print("And HELLO WORLD!")

decorated = Decor(Hello)
decorated

Upvotes: 1

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