CODEWITHSUNDEEP
pythonfor-loop
crypatix
crypatix

Reputation: 55

Looping a list through dictionary values python

I was wondering if it's possible to loop a list of values
Example:

lst = ['RH', 'CD241', 'C2', 'SCZD9', 'RG59L', 'WNT3A']

through the values of a dictionary
Example:

ref_dict = {
    '': [''], '6005': ['RH50A', 'CD241', 'SLC42A1'], '603': [''],
    '6000': [''], '8787': ['PERRS', 'RGS9L', 'MGC26458'],
    '41': ['ACCN2', 'BNaC2', 'hBNaC2'], '8490': [''],
    '9628': [''], '5999': ['SCZD9']
}

To check if the individual value in the list has the value in the dictionary, if it does have the value, then it would return me the key in which the value is in.

Example : lst value CD241 is in the dictionary '6005': ['RH50A, CD241, SLC42A1'], it would return me key "6005".

Upvotes: 0

Views: 104

Answers (3)

ComputerFellow
ComputerFellow

Reputation: 12108

Something like, 

for key in ref_dict.keys():
    if set(lst) & set(ref_dict[key]):
        #do something with your key
        #key is the key you want

If there are multiple keys where one of the elements in lst will exist, then you can get the list of these keys with a list comprehension,

[key for key in ref_dict.keys() if set(lst) & set(ref_dict[key])]

which outputs ['6005', '5999'] for your case.

The magic is happening in the set intersection part,

(set(['RH', 'CD241', 'C2', 'SCZD9', 'RG59L', 'WNT3A']) & 
 set(['RH50A', 'CD241', 'SLC42A1']))

will give you - ['CD241'], as good as checking if something in lst exists in the value list or not.

Upvotes: 1

Dinesh Panchananam
Dinesh Panchananam

Reputation: 694

from collections import defaultdict

lst = ['RH', 'CD241', 'C2', 'SCZD9', 'RG59L', 'WNT3A']
ref_dict = {
    '': [''], '6005': ['RH50A, CD241, SLC42A1'], '603': [''],
    '6000': [''], '8787': ['PERRS, RGS9L, MGC26458'],
    '41': ['ACCN2, BNaC2, hBNaC2'], '8490': [''],
    '9628': [''], '5999': ['SCZD9']
}


all_values = defaultdict(list)
for key in ref_dict:
    for value in (map(lambda x: x.strip(), ref_dict[key][0].split(","))):
        all_values[value].append(key)

print all_values['CD241'] # ['6005']

Upvotes: 0

Thomas Williams
Thomas Williams

Reputation: 13

Try this: 

for key in ref_dict:
    if ref_dict[key] != 0:
        return key
        #if you want to use the value

This might link help

Upvotes: 0

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