CODEWITHSUNDEEP
pythonlist
gython
gython

Reputation: 875

Replace values in a nested list with values of another nested list based on a condition

I have two lists:

l = [
     ['0.064', 'facebook', '0'],  
     ['0.019', 'twitt', '0'], 
     ['0.018', 'netzwerk', '0'], 
     ['0.016', 'nachricht', '0'], 
     ['0.015', 'youtub', '0']
     ]

fl = [
     ['twitter', 'twitt', 1], 
     ['youtube', 'youtub', 2], 
     ['nachrichten', 'nachricht', 4]
     ]

As you can see the entries at index [1] in list l are stems, which I want to replace with values from list fl.

So if both entries at index [1] in list l and fl then I want to replace the entry at index [1] in l with the entry at index [0] in fl.

Expected result:

keys = [
     ['0.064', 'facebook', '0'],  
     ['0.019', 'twitter', '0'], 
     ['0.018', 'netzwerk', '0'], 
     ['0.016', 'nachrichten', '0'], 
     ['0.015', 'youtube', '0']
     ]

I tried something like this: 

keys =[]
for l in l:
    for i in fl:
        if l[1] == i[1]:
            i[1].replace(i[1], l[0])
            keys.append(i)

But this does not work.

Can somebody help?

Upvotes: 0

Views: 93

Answers (1)

Austin
Austin

Reputation: 26039

Your second list is better transformed to a dictionary and make use of O(1) lookup:

l = [
     ['0.064', 'facebook', '0'],  
     ['0.019', 'twitt', '0'], 
     ['0.018', 'netzwerk', '0'], 
     ['0.016', 'nachricht', '0'], 
     ['0.015', 'youtub', '0']
]

fl = [
     ['twitter', 'twitt', 1], 
     ['youtube', 'youtub', 2], 
     ['nachrichten', 'nachricht', 4]
]

d = dict((x[1], x[0]) for x in fl)
keys = [[x[0], d.get(x[1], x[1]), x[2]] for x in l]

print(keys)

Upvotes: 2

Related Questions