CODEWITHSUNDEEP
pythonlistpython-2.7dictionaryfor-loop
Navi
Navi

Reputation: 1052

How to compare a two list of dict values with one particular value in python?

I am having two dicts, one in list:

var_a = [{'name':"John",'number':21},{'name':"Kevin",'number':23}]
var_b = {'21':"yes"},{'24':"yes"}

I need to compare var_a and var_b with the key from var_b with the number value in var_a.

I have tried this and got the output:

for key, value in var_b.iteritems():
    for l in var_a:
        if l['number'] == key:
           print l

This needs two loops to get the output. So is there any way to finish this is single loop with python 2.7?

Upvotes: 0

Views: 63

Answers (2)

Santhosh
Santhosh

Reputation: 219

I think you need to use the lambda function with one for-loop:

for key, value in var_b.iteritems():
    result = filter(lambda d: d['id'] == key, var_a)

The result will give you the output for sure.

Upvotes: 0

Leo Arad
Leo Arad

Reputation: 4472

You can use map to create a keys set from var_b keys and then loop only over var_a to check if the number value exists in the var_b keys set

var_a = [{'name':"John",'number':21},{'name':"Kevin",'number':23}]
var_b = [{'21':"yes"},{'23':"no"}]

keys_set = set(map(lambda x: int(list(x.keys())[0]), var_b))
for i in var_a:
    if i['number'] in keys_set:
        print(i)

Output

{'name': 'John', 'number': 21}
{'name': 'Kevin', 'number': 23}

Upvotes: 1

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