CODEWITHSUNDEEP
pythonlistloopsdictionarytuples
KKH7
KKH7

Reputation: 11

loop tuple list - TypeError: unhashable type: 'list'

this works:

shopping_list = ["banana", "orange", "apple"]

stock = {
    "banana": 6,
    "apple": 0,
    "orange": 32,
    "pear": 15
}

prices = {
    "banana": 4,
    "apple": 2,
    "orange": 1.5,
    "pear": 3
}

def compute_bill(food):
    total = 0
   # food = tuple(food)
    for food in food:
        total += prices[food]

    return total 

print compute_bill(shopping_list)

But if I change food to anything else in the loop, for example X - for x in food - then python gives me below error (it only works with for food in food.)

Traceback (most recent call last):
  File "compute-shopping.py", line 25, in <module>
    print compute_bill(shopping_list) 
  File "compute-shopping.py", line 21, in compute_bill
    total += prices[food]
TypeError: unhashable type: 'list'

This is not related to using tuple or list as key for dictionary ... or is it ?!

Upvotes: 0

Views: 1373

Answers (1)

gtlambert
gtlambert

Reputation: 11971

Assuming food is a list, you just need to change the for loop to:

for food_type in food:
    total += prices[food_type]

Upvotes: 2

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