CODEWITHSUNDEEP
pythonpython-3.x
Ebin Davis
Ebin Davis

Reputation: 6139

Comparing the values inside a list with dictionary values inside the list

I have a dictionary inside a list :

list1 = [{'Value': 'John','Key': 'Name'},{'Value':'17','Key': 'Number'}]

And i have a list:

list2 = ['Name','Number']

How to check the values inside list2 are present in the list1. If present i need to list the the Value.

Eg: If Name is present , print "John"

Upvotes: 0

Views: 42

Answers (4)

Laurent H.
Laurent H.

Reputation: 6526

Here is my one-line style suggestions easily readable IMHO.

  1. First solution with result sorted in the same order as list1: 

    list1 = [{'Value': 'John','Key': 'Name'},{'Value':'17','Key': 'Number'}]
list2 = ['Name','Number']

values = [x['Value'] for x in list1 if x['Key'] in list2]

print(values)
# ['John', '17']

  2. Second solution with result sorted in the same order as list2: 

    list1 = [{'Value': 'John','Key': 'Name'}, {'Value':'17','Key': 'Number'}]
list2 = ['Number', 'Name']

values = [x['Value'] for v in list2 for x in list1 if x['Key'] == v]

print(values)
# ['17', 'John']

Upvotes: 1

jpp
jpp

Reputation: 164843

You can use a for loop. Note I use set for list2 to enable O(1) lookup within your loop.

list1 = [{'Value': 'John','Key': 'Name'},{'Value':'17','Key': 'Number'}]

list2 = {'Name', 'Number'}

for item in list1:
    if item['Key'] in list2:
        print(item['Value'])

# John
# 17

Upvotes: 1

L3viathan
L3viathan

Reputation: 27331

First of all I would transform your list1 into its destiny: a dictionary.

dict1 = {d['Key']: d['Value'] for d in list1}

Then you can simply loop over list2 and print the value if the key is there:

for key in list2:
    if key in dict1:
        print(dict1[key])

This prints:

John
17

Upvotes: 0

Taohidul Islam
Taohidul Islam

Reputation: 5424

Please also read the comments:

for i in list2: #iterate through list2
        for j in list1: #iterate through list of dictinaries
            if i in j.values(): #if value of list2 present in the values of a dict then proceed
                print(j['Value'])

Upvotes: 1

Related Questions