Help with Python classes

Python
1

I want to call a method of class A, from class B; but I get an error which I do ot understand.
Can anyone help me resolve my issue?
Here’s my code and error:

class Environment:
def init(self,state):
self.loc1_ = ‘A’
self.loc2_ = ‘B’
self.state_ = state

    def setloc1_state(self,state): #state='D'
	self.state_[0] = state

class Agent:
def init(self,percept:list,location:‘str’,action:‘str’=‘N’,goal:list=[‘C’,‘C’]):
self.percept_ = percept
self.cost_ = 0
self.location_ = location
self.action_ = action
self.goal_ = goal

   def clean(self):
	place = self.getlocation()
	if place == 'A':
		Environment.setloc1_state(self,'C')
	if place == 'B':
		Environment.setloc2_state(self,'C')

def main():
init_state = [‘D’,‘D’]

house = Environment(init_state)

vacuum = Agent(percept=house.getstate(),location='A')

while house.getstate() != ['C','C']:
	vacuum.execute_action(house.getstate())
print(house.getstate())

main()

I get this error:
AttributeError: ‘Agent’ object has no attribute ‘state_’; related to this line of the clean() function:
“Environment.setloc1_state(self,‘C’)”

I read several tutorials which explains this concept ofcalling class members from another class, and those examples worked. So, I’m not sure why this code snippet does not distinguish between the “self” variabble linked to the 2 different classes.

Please educate me?

2

I don’t know what Digi product you are working with, but the product may not support the class function or it could be that the version of Python supported by the device uses a different call for Class.

3

Hi this is Palak
I also worked with Python. And I also faced these kind of problem while I was developing Snake game using Python. In my recent search I have seen this post(https://www.techgeekbuzz.com/blog/python-attributeerror-str-object-has-no-attribute-append-solution/) over the internet it can helps you.

Thanks

4

Replace
vacuum = Agent(percept=house.getstate(),location=‘A’)
with:
vacuum = Agent(percept=house,location=‘A’)

Replace:
def clean(self):
place = self.getlocation()
if place == ‘A’:
Environment.setloc1_state(self,‘C’)
if place == ‘B’:
Environment.setloc2_state(self,‘C’)
with:
def clean(self):
place = self.getlocation()
if place == ‘A’:
self.percept_.setloc1_state(self,‘C’)
if place == ‘B’:
self.percept_.setloc2_state(self,‘C’)

5

Well, there are some issues with your code.
Can you try below code, hope it can fix your error.

class Environment:
    def __init__(self, state):
        self.loc1_ = 'A'
        self.loc2_ = 'B'
        self.state_ = state

    def setloc1_state(self, state):
        self.state_[0] = state

class Agent:
    def __init__(self, percept, location='A', action='N', goal=['C', 'C']):
        self.percept_ = percept
        self.cost_ = 0
        self.location_ = location
        self.action_ = action
        self.goal_ = goal

    def clean(self):
        place = self.location_
        if place == 'A':
            # You need to access the Environment object to call setloc1_state
            self.percept_.setloc1_state('C')
        if place == 'B':
            # You may want to add a setloc2_state method in Environment as well
            self.percept_.setloc2_state('C')

def main():
    init_state = ['D', 'D']

    house = Environment(init_state)

    vacuum = Agent(house, location='A')  # Pass the Environment instance to Agent

    while house.state_ != ['C', 'C']:
        vacuum.clean()

    print(house.state_)

if __name__ == "__main__":
    main()

Thanks

6

Join practical Python classes here and learn with experts.

7

Connect with Us:
Sithub
Email: info@sithub.in
Website: www.sithub.in
Phone Number: +91-7210018919
Location: 32, Gram Sabha, Sewak Park, Uttam Nagar, New Delhi 110059. Nearby Dwarka Mod Metro Station, Pillar No 774
Establishment Year: 2015