CODEWITHSUNDEEP
pythonpython-3.xdictionary
Billy Cole
Billy Cole

Reputation: 127

how to check if a key and value from one dictionary is in another?

I'm having trouble searching if a key and corresponding value from one dictionary (stock) is in another dictionary (basket)

this is the error I receive:

File "C:/Users/mbbx2wc3/.spyder2-py3/temp.py", line 35, in <module>
  if stock['10005'] in basket:

TypeError: unhashable type: 'dict'

And this is my code if you want to have a look. I have tried is stock[key] in basket. but this gives an error and I cannot think of an alternative to try.

Many thanks

        stock = {
            '10005' : {
                    'name' : 'Conference Pears Loose',
                    'price' : 2.00,
                    'unit' : 'kg', 
                    'promotion' : None,
                    'group' : None,
                    'amount' : 1.550
             },
             '10013' : {
                    'name' : 'Emmental Slices 250G',
                    'price' : 1.75,
                    'unit' : 'pieces', 
                    'promotion' : 'get2pay1',
                    'group' : None,
                    'amount' : 9
             },
             '10015' : { 
                    'name' : 'Diced Beef 400G', 
                    'price' : 4.50,
                    'unit' : 'pieces', 
                    'promotion': 'get4pay3',
                    'group' : 4,
                    'amount' : 14
            }}

        basket = {}

        if stock['10005'] in basket:
            print("yay")
        else:
            print("noo")

Upvotes: 0

Views: 2101

Answers (5)

Stanisław Łabądź
Stanisław Łabądź

Reputation: 895

import json 
stock = {
        '10005' : {
                'name' : 'Conference Pears Loose',
                'price' : 2.00,
                'unit' : 'kg', 
                'promotion' : None,
                'group' : None,
                'amount' : 1.550
         },
         '10013' : {
                'name' : 'Emmental Slices 250G',
                'price' : 1.75,
                'unit' : 'pieces', 
                'promotion' : 'get2pay1',
                'group' : None,
                'amount' : 9
         },
         '10015' : { 
                'name' : 'Diced Beef 400G', 
                'price' : 4.50,
                'unit' : 'pieces', 
                'promotion': 'get4pay3',
                'group' : 4,
                'amount' : 14
        }}

basket = {}
for item in stock.keys():
    if item in basket.keys():
        print("This key " + item + " is in basket") 
    else:
        print("This key " + item + " is not in basket")

for item in stock.values():
    if item in basket.values():
        print("This value " + json.dumps(item) + " is in basket") 
    else:
        print("This value " + json.dumps(item) + " is not in basket")

Upvotes: 0

sehrob
sehrob

Reputation: 1044

You can try something like this:

key = 'a key your are testing'
if basket.get(key, false) == stock[key]:
    print('yes')
else:
    print('no')

Upvotes: 0

larsks
larsks

Reputation: 311606

First of all, you can't test if something contains a dictionary. The error message TypeError: unhashable type: 'dict' is basically telling you that; there are some details about that here.

You're probably going to need a two step process:

  1. Is the given key in the target dictionary?
  2. Does the corresponding value match?

For example:

if '10005' in basket and basket['10005'] == stock['10005']:
    print "Yup"
else:
    print "Nope"

Upvotes: 0

Kenny Ostrom
Kenny Ostrom

Reputation: 5871

You are looking to see if the value of stock['10005'], which is some large dict, is also a key in basket.

https://docs.python.org/2/library/stdtypes.html#typesmapping

A dictionary’s keys are almost arbitrary values. Values that are not hashable, that is, values containing lists, dictionaries or other mutable types (that are compared by value rather than by object identity) may not be used as keys.

I think perhaps you want to see if '10005' in basket

Upvotes: 1

alec_djinn
alec_djinn

Reputation: 10789

Just use the key...

if '10005' in basket:
    print("it's in basket")
elif '10005' in stock:
    print("it's in stock")
else:
    print("it's nowhere")

Upvotes: 1

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