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How to call an object's methods from another object?

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Join Date: Oct 2009

Posts: 73

Reputation: lrh9 is an unknown quantity at this point

Solved Threads: 10

lrh9

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Junior Poster in Training

How to call an object's methods from another object?

Oct 24th, 2009

I want to call another object's methods from another object, and I have no idea how.

Can someone please help me? Thank you.

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Join Date: Aug 2008

Posts: 161

Reputation: snippsat is an unknown quantity at this point

Solved Threads: 49

snippsat

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Junior Poster

Oct 24th, 2009

It easier to help if you post some code and explain what the problem is.

Last edited by snippsat; Oct 24th, 2009 at 3:57 am.

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Join Date: Oct 2009

Posts: 73

Reputation: lrh9 is an unknown quantity at this point

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lrh9

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Junior Poster in Training

Oct 24th, 2009

OK. I tested calling one object's methods from another object like so.

 Help with Code Tags 
 Python Syntax (Toggle Plain Text) 
class Test:
 
    def Call_Test2_Method(self, target):
        target.Test2_Method()
 
 
class Test2:
 
    def Test2_Method(self):
        print("This is Test2's method.")
 
 
x = Test()
y = Test2()
 
x.Call_Test2_Method(y)
 
def nested_test():
    c = Test()
    d = Test2()
 
    c.Call_Test2_Method(d)
 
def test():
    a = Test()
    b = Test2()
 
    a.Call_Test2_Method(b)
 
    nested_test()
 
test()
class Test:

    def Call_Test2_Method(self, target):
        target.Test2_Method()


class Test2:

    def Test2_Method(self):
        print("This is Test2's method.")


x = Test()
y = Test2()

x.Call_Test2_Method(y)

def nested_test():
    c = Test()
    d = Test2()

    c.Call_Test2_Method(d)

def test():
    a = Test()
    b = Test2()

    a.Call_Test2_Method(b)

    nested_test()

test()

I obtained:

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This is Test2's method.
This is Test2's method.
This is Test2's method.

Must be a bug in my actual program.

•

Join Date: Aug 2008

Posts: 161

Reputation: snippsat is an unknown quantity at this point

Solved Threads: 49

snippsat

Offline

Junior Poster

Oct 24th, 2009

Look at this,and se if inherits from other classes make it clearer.
What you are doing is not the way to this.

 Help with Code Tags 
 Python Syntax (Toggle Plain Text) 
>>> class Test:
	def a(self):
		self.var1 = 5000
		print 'i am a'
 
 
>>> class Test1(Test):
	def b(self):
		print 'i am b'
		print 'value from class Test method a is %d' % (self.var1)
 
 
>>> c = Test1()
>>> c.a()
i am a
>>> c.b()
i am b
value from class Test method a is 5000
>>>
>>> class Test:
	def a(self):
		self.var1 = 5000
		print 'i am a'

		
>>> class Test1(Test):
	def b(self):
		print 'i am b'
		print 'value from class Test method a is %d' % (self.var1)

		
>>> c = Test1()
>>> c.a()
i am a
>>> c.b()
i am b
value from class Test method a is 5000
>>>

Last edited by snippsat; Oct 24th, 2009 at 4:43 am.

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Join Date: Oct 2009

Posts: 73

Reputation: lrh9 is an unknown quantity at this point

Solved Threads: 10

lrh9

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Junior Poster in Training

Oct 24th, 2009

That works fine if the second class builds on the function of the first. I'm talking about messaging between two conceptually different objects.

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Join Date: Jul 2008

Posts: 1,054

Reputation: jlm699 is a jewel in the rough

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jlm699

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Knows where his Towel is

Oct 24th, 2009

•

Originally Posted by lrh9

OK. I tested calling one object's methods from another object like so.
...
Must be a bug in my actual program.

Can you explain what the bug is? Each call worked and printed "This is Test2's method."

What was the expected output?

EDIT: I think I understand now. You're saying the real program that you made didn't work but this test script did? If that's the case disregard my above questions

Last edited by jlm699; Oct 24th, 2009 at 6:26 am.

1. Use Code Tags.
2. Homework? Show Effort.
3. Keep discussions on the forum: no PMs

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Join Date: Oct 2009

Posts: 73

Reputation: lrh9 is an unknown quantity at this point

Solved Threads: 10

lrh9

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Junior Poster in Training

Oct 24th, 2009

•

Originally Posted by jlm699

EDIT: I think I understand now. You're saying the real program that you made didn't work but this test script did? If that's the case disregard my above questions

That's what I meant. I'm sorry I wasn't clear.

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Originally Posted by snippsat

It easier to help if you post some code and explain what the problem is.

Basically I'm trying to show these individuals a little object oriented design and code.

http://www.daniweb.com/forums/thread232741.html

http://www.daniweb.com/forums/thread232184.html

I was working on writing something similar to the first one, nothing complex but just a player class, a monster class, and a small battle, when I wanted to write a few methods. I wrote a method for a player to select among battle options, but only coded one option. The "attack" option. Then the player would need to select his or her target. So instead of taking time to code a way to display the monsters in the current battle and select from one, I just hard coded a target. Then I'd call the actual attack method to trigger the target's on hit method. That's where it failed. I'll probably go back and write the test battle with just one opponent.

I haven't worked on the second one yet.