You can call many functions from another function in Python. Each of the functions we write can be used and called from other functions we write.
# function definition def fun(): print("Called fun()") # calling a function fun()
You can do something like this:
def addOne(x): return x+1 def useFunction(addOne, x): return addOne(x)**2
Python call function from another function
Simple example code.
def fun2(): print("Called by fun1()") def fun1(): print("Called by main function") fun2() # calling fun2() from fun1() fun1()
Use a function Output as an Input of another function
# Method 1: using return value inside another function def fun1(a): res = a + 1 return res def fun2(c): res = c * 2 return res output = fun1(fun2(1)) print(output) # Method 2: directly calling one function in the other def function_1(n): v = n * n num = function_2(v) return num def function_2(a_number): a_number = a_number * 2 return a_number print(function_1(10))
Call a nested function (function inside another function)
Create a nested function attribute like so:
def foo(): # for closures or strictly local function # then this is useful! # ugly hack other wise to try and create methods. def bar(): print('bar') # if there are multiple function, return a container... return bar
foo.bar=foo() foo.bar() # prints 'bar'
But, this is far easier with a class:
class Foo: # class can hold related methods, setters and getters, # protected variables, etc. # Python is DESIGNED to do this. def bar(self): print('bar')
f=Foo() f.bar() # prints 'bar'
Do comment if you have any doubts or suggestions on this Python function topic.
Note: IDE: PyCharm 2021.3.3 (Community Edition)
All Python Examples are in Python 3, so Maybe its different from python 2 or upgraded versions.
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