How to Correctly Call a Class Function from Within Another Class Function?

Calling Functions Within a Class

When working with object-oriented programming, you may need to call functions within a class. One common scenario is to define two functions within the same class and call one function from within another. This article will walk you through the process of calling a function within a class.

In this example, we have a class named Coordinates with two functions: distToPoint and isNear. The distToPoint function calculates the distance between two coordinates, while the isNear function checks if a point is near another point based on the calculated distance.

The original code provided:

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

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

In this code, an error occurs when attempting to call the distToPoint function within the isNear function. To correctly call a function within a class, it must be called as a member function on the instance (self). The following code shows the corrected version:

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

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

By using self.distToPoint(p) within the isNear function, the distToPoint function is correctly called as a member function on the current instance of the Coordinates class.

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