Menu
I have this code which calculates the distance between two coordinates. The two functions are both within the same class.
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)
...
346
Accessing the method of a class To access the method of a class, we need to instantiate a class into an object. Then we can access the method as an instance method of the class as shown in the program below. Here through the self parameter, instance methods can access attributes and other methods on the same object.
Instance methods are built functions into the class definition of an object and require an instance of that class to be called. To call the method, you need to qualify function with self. . For example, in a class that contains functions first() and second(), first() can call second().
Since these are member functions, call it as a member function on the instance, self.
def isNear(self, p):
self.distToPoint(p)
...
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).
42
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
