How to call a function within a class from another class

[Aaron Dingo]

Hi there,

could you help me spot my error - I'm sure it's a simple one. I'm just trying to understand classes in Python a little better (working through Learn Python The Hard Way).

Basically I want the printokay function in Testclass2 to run after being called from Testclass1

class Testclass1(object):

    def __init__(self, var1):
        self.printthis = var1
        
    def printthing(self):
        lookatme = self.printthis
        Testclass2(lookatme).printokay()

class Testclass2(object):
    def __init(self, var2):
        self.okayletsprint = var2

    def printokay(self):
        print "this is text"
        print self.okayletsprint

a = Testclass1("jumbo")
a.printthing()

[bvdet]

You left out 2 underscore characters in Testclass2.__in it__(self).

[Aaron Dingo]

Rearranged

okay, underscores are included - thanks for spotting that.

I've been changing it around and now when I run this it still doesn't print (no error messages - nada).

class Testclass1(object):

    def __init__(self, var1):
        self.printthis = var1

    def printthing(self):
        lookatme = self.printthis
        Testclass2.printokay(lookatme)

class Testclass2(object):
    def __init__(self, var2):
        self.okayletsprint = var2

    def printokay(self):
        print "this is text"
        print self.okayletsprint

a = "jumbo"
Testclass1(a).printthing

[bvdet]

In order to call function or a method of an instance, you must include the parentheses. Testclass1(a).p rintthing()

[Aaron Dingo]

Excellent, thank you. Ammended code is attached for anyone that has a similar problem.

class Testclass1(object):

    def __init__(self, var1):
        self.printthis = var1

    def printthing(self):
        Testclass2().printokay()

class Testclass2(object):
    def __init__(self):
        self.okayletsprint = 1

    def printokay(self):
        print "this is text"
        print self.okayletsprint


a = Testclass1("jumbo bitch")
a.printthing()