How to call a function inside a class in python

Question

I have this code which calculates the distance between two coordinates. The two functions are both within the same class.

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How do you call a function within a class in Python?
What do you call a function inside a class?
How do you call a function inside another function in the same class?
How do you call a method in another method in Python?

However, how do I call the function distToPoint in the function isNear?

class Coordinates:
    def distToPoint(self, p):
        """
        Use pythagoras to find distance
        (a^2 = b^2 + c^2)
        """
        ...

    def isNear(self, p):
        distToPoint(self, p)
        ...

How to call a function inside a class in python

asked Apr 11, 2011 at 0:20

0

Since these are member functions, call it as a member function on the instance, self.

def isNear(self, p):
    self.distToPoint(p)
    ...

answered Apr 11, 2011 at 0:24

Jeff MercadoJeff Mercado

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4

That doesn't work because distToPoint is inside your class, so you need to prefix it with the classname if you want to refer to it, like this: classname.distToPoint(self, p). You shouldn't do it like that, though. A better way to do it is to refer to the method directly through the class instance (which is the first argument of a class method), like so: self.distToPoint(p).

answered Apr 11, 2011 at 0:24

Aleksi TorhamoAleksi Torhamo

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6

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Prerequisite: Functions in Python
In Python, any written function can be called by another function. Note that this could be the most elegant way of breaking a problem into chunks of small problems. In this article, we will learn how can we call a defined function from another function with help of multiple examples.

Calling and Called Function ?
The Function which calls another Function is called Calling Function and function which is called by another Function is call Called Function.

How does Function execution work?
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. When the called function completes its execution and returns then the calling function is popped from the stack and executed. Calling Function execution will be completed only when called Function is execution completes.

In the below figure. The function call is made from the Main function to Function1, Now the state of the Main function is stored in Stack, and execution of the Main function is continued when the Function 1 returns. The Fucntion1 Calls Function2 now the State of the Function1 is stored stack and execution of Function 1 will be continued when Function 2 returns.

Consider the below Example of the function call. The Function SumOfSquares function calls the Function Square which returns the square of the number.

Python3

def Square(X):

return (X * X)

def SumofSquares(Array, n):

Sum = 0

for i in range(n):

SquaredValue = Square(Array[i])

Sum += SquaredValue

return Sum

Array = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

n = len(Array)

Total = SumofSquares(Array, n)

print("Sum of the Square of List of Numbers:", Total)

Output :

Sum of the Square of List of Numbers: 385

Calling Function From another Function within Same class –
In the below example, the class method Function1 calls method Function2 from the class.

Python3

class Main:

def __init__(self):

self.String1 ="Hello"

self.String2 ="World"

def Function1(self):

self.Function2()

print("Function1 : ", self.String2)

return

def Function2(self):

print("Function2 : ", self.String1)

return

Object = Main()

Object.Function1()

Output :

Function2 :  Hello
Function1 :  World

Calling parent class Function from Child class Function –
Consider the below example the child class method invokes the parent class method. The child class inherits the attributes from the parent class.

Python3

class Parent:

def __init__(self):

self.String1 ="Hello"

self.String2 ="World"

def Function2(self):

print("Function2 : ", self.String1)

return

class Child(Parent):

def Function1(self):

self.Function2()

print("Function1 : ", self.String2)

return

Object1 = Parent()

Object2 = Child()

Object2.Function1()

Output :

Function2 :  Hello
Function1 :  World

How do you call a function within a class in Python?

How to call an instance method in the same class in Python.

class c:.

def f(self):.

print("abc").

def g(self):.

self. f().

print("def") Function g( ) calls function f( ).

class_instance = c().

class_instance. f().

What do you call a function inside a class?

Inner functions, also known as nested functions, are functions that you define inside other functions. In Python, this kind of function has direct access to variables and names defined in the enclosing function. Inner functions have many uses, most notably as closure factories and decorator functions.

How do you call a function inside another function in the same class?

Answers (1) First, you can use a dot/period to access the method from the class variable. Second, you can simply call the function and pass the class object as an argument. Using MATLAB's Create a Simple Class Example as a basis, I've added the doBoth function below to illustrate both of these options.

How do you call a method in another method in Python?

The Function which calls another Function is called Calling Function and function which is called by another Function is call Called Function. How does Function execution work? A stack data structure is used during the execution of the function calls.

programming python Class Python Class type Python

How to call a function inside a class in python

Python3

Python3

Python3

How do you call a function within a class in Python?

What do you call a function inside a class?

How do you call a function inside another function in the same class?

How do you call a method in another method in Python?

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