How to fix a Attribute Error for a 'NoneType' in python3?

I'm trying to create a function that will merge two dictionaries through the use of Classes but I am unable to because I keep getting an AttributeError of 'NoneType.'However, when running the code individually without my entire code the function works, which confuses me.
My entire code is:

prices =
"apple": 1,
"beets": 1,
"carrots": 1

cookbook=

total=20


def handle_commands():
keep_going=True
while keep_going:
choices=input("$ ").strip().lower().split()
command=choices[0]
if command == "loadrecipefile":
recipe_file=choices[1]
loadrecipefile(recipe_file)
elif command == "printrecipes":
printrecipes()
elif command == "printiinventory":
printiinventory()
elif command == "printmoney":
printmoney()
elif command == "preparedish":
recipe_name=choices[1]
preparedish(recipe_name)
elif command == "buyingredient":
name=choices[1]
number=int(choices[2])
buyingredient(name, number)
elif command == "setprices":
apple_price=int(choices[1])
beets_price=int(choices[2])
carrots_price=int(choices[3])
setprices(apple_price, beets_price, carrots_price)
elif command == "mergerecipes":
r1=choices[1]
r2=choices[2]
mergerecipes(r1,r2)
elif command == "quit":
keep_going=False
break
else:
print("Sorry that is not an acceptable command")
return

def loadrecipefile (recipe_file):
infile=open(recipe_file)
Linelist=infile.readlines()
for line in Linelist:
wordList=line.split()
r1=Recipe(wordList[0],int(wordList[1]),int(wordList[2]),int(wordList[3]))
cookbook.addRecipe(r1)

def printrecipes():
for recipe in cookbook.allRecipes():
print(recipe.getName(),int(recipe.getApples()),int(recipe.getBeets()),int(recipe.getCarrots()))

def buyingredient(name, number:int):
global total
if number*prices[name] > total:
print("Not enough cash!")
if iinventory == 'apple':
iinventory.getApples()
elif iinventory == 'beets':
iinventory.getBeets()
elif iinventory == 'carrots':
iinventory.getCarrots()

iinventory[name] += number
total -= number*prices[name]

def printiinventory():
print(int(iinventory.getApples()), int(iinventory.getBeets()), int(iinventory.getCarrots()))

def printmoney():
print(total)

def CanPrepareDish(recipe_name):
recipe = cookbook[recipe_name]
for ingred in recipe:
if ingred not in iinventory:
return False
if iinventory[ingred] < recipe[ingred]:
return False
return True

def preparedish(recipe_name):
if not CanPrepareDish(recipe_name):
print("Not enough ingredients")
else:
recipe = cookbook[recipe_name]
for ingred in recipe:
iinventory[ingred] -= recipe[ingred]
if recipe_name in iinventory:
iinventory[recipe_name] +=1
else:
iinventory[recipe_name] = 1
print("Dish prepared")

#for recipe in cookbook.allRecipes():
#if recipe_name == recipe.getName():


def setprices(apple_price, beets_price, carrots_price):
for name,value in prices.items():
prices["apple"] = apple_price
prices["beets"] = beets_price
prices["carrots"] = carrots_price

def mergerecipes(r1,r2):
dish1 = cookbook.getRecipe(r1)
dish2 = cookbook.getRecipe(r2)
name = dish1.getName() + dish2.getName()
apple_num = dish1.getApples() + dish2.getApples()
beet_num = dish1.getBeets() + dish2.getBeets()
carrot_num = dish1.getCarrots() + dish2.getCarrots()
rnew=Recipe(name,apple_num,beet_num,carrot_num)

class Recipe:
def __init__(self,name,apple_num,beet_num,carrot_num):
self.name=str(name)
self.apple_num=int(apple_num)
self.beet_num=int(beet_num)
self.carrot_num=int(carrot_num)
def getName(self):
return self.name
def getApples(self):
return self.apple_num
def getBeets(self):
return self.beet_num
def getCarrots(self):
return self.carrot_num

class Iinventory:
def __init__(self):
self.apple_num=0
self.beets_num=0
self.carrots_num=0
def getApples(self):
return int(self.apple_num)
def getBeets(self):
return int(self.beets_num)
def getCarrots(self):
return int(self.carrots_num)

iinventory=Iinventory()

class Cookbook:
def __init__(self):
self.Cooklist=
def addRecipe(self,Recipe):
self.Cooklist.append(Recipe)
def getRecipe(self,recipe_name):
for recipe in self.Cooklist:
if recipe_name == recipe.getName():
return recipe
def allRecipes(self):
for Recipe in self.Cooklist:
return self.Cooklist

cookbook=Cookbook()

handle_commands()


But with only this portion of the code, the function mergerecipes works. I would like to know why and how to fix the error of fixing my code for that function to work in my entire code.

The snippet of my entire code:

cookbook=
class Recipe:
def __init__(self,name,apple_num,beet_num,carrot_num):
self.name=str(name)
self.apple_num=int(apple_num)
self.beet_num=int(beet_num)
self.carrot_num=int(carrot_num)
def getName(self):
return self.name
def getApples(self):
return self.apple_num
def getBeets(self):
return self.beet_num
def getCarrots(self):
return self.carrot_num

class Cookbook:
def __init__(self):
self.Cooklist=
def addRecipe(self,Recipe):
self.Cooklist.append(Recipe)
def getRecipe(self,recipe_name):
for recipe in self.Cooklist:
if recipe_name==recipe.getName():
return recipe
def allRecipes(self):
for Recipe in self.Cooklist:
return self.Cooklist

cookbook=Cookbook()

def mergerecipes(r1,r2):
dish1 = cookbook.getRecipe(r1)
dish2 = cookbook.getRecipe(r2)
name = dish1.getName() + dish2.getName()
apple_num = dish1.getApples() + dish2.getApples()
beet_num = dish1.getBeets() + dish2.getBeets()
carrot_num = dish1.getCarrots() + dish2.getCarrots()
rnew=Recipe(name,apple_num,beet_num,carrot_num)
cookbook.addRecipe(rnew)
print(rnew.getName(),int(rnew.getApples()),int(rnew.getBeets()),int(rnew.getCarrots()))

def loadrecipefile (recipe_file):
infile=open(recipe_file)
Linelist=infile.readlines()
for line in Linelist:
wordList=line.split()
r1=Recipe(wordList[0],int(wordList[1]),int(wordList[2]),int(wordList[3]))
cookbook.addRecipe(r1)

def printrecipes():
for recipe in cookbook.allRecipes():
print(recipe.getName(),int(recipe.getApples()),int(recipe.getBeets()),int(recipe.getCarrots()))


So when I load a textfile it inputs the "recipes" into the cookbook, which then you can see through printrecipes.

An example of an output would be:

loadrecipefile('recipes.txt')
printrecipes()
Dish1 2 4 1
Dish2 2 2 2
Dish3 1 2 4
Dish4 0 2 1
mergerecipes('Dish1','Dish3')
printrecipes()
Dish1 2 4 1
Dish2 2 2 2
Dish3 1 2 4
Dish4 0 2 1
Dish1Dish3 3 6 5


**IF CONFUSED: I tried running the merge recipes when running my entire code and I get this error:

$ loadrecipefile recipes.txt
$ printrecipes
Dish1 2 4 1
Dish2 2 2 2
Dish3 1 2 4
Dish4 0 2 1
$ mergerecipes Dish1 Dish2
name = dish1.getName() + dish2.getName()
AttributeError: 'NoneType' object has no attribute 'getName'


All help would be appreciated

1 Answer
1

You're calling lower() on the input, so 'Dish1' becomes 'dish1', which is not found in the list of recipes, and so getRecipe() returns None.

lower()

'Dish1'

'dish1'

getRecipe()

None

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