CODEWITHSUNDEEP
pythonlist
Lee
Lee

Reputation: 25

Using two lists to define a variable in python

I have two lists that have a relationship with each other. List1 is descriptors and List2 is rankings of those descriptions

list1 = ["String1", "String2", "String3"]

list2 = ["2", "1", "3"]

What I want to be able to do is create variables that link these up. So if I want to print ranking number 1, I would get what was originally string2.

What's the best way to approach this?

Upvotes: 0

Views: 591

Answers (2)

Sheng
Sheng

Reputation: 3555

Use a dictionary, such as

content = {"2":"String1", "1":"String2", "3":"String3"}
print content["1"]

If you would like to generate the dic from list, you could:

content = dict((key, value) for (key, value) in zip(list2, list1))

Thanks to @minitech, a much more beautiful statement would be:

content = dict(zip(list2, list1))

Upvotes: 2

Christian Tapia
Christian Tapia

Reputation: 34146

You could try a dictionary. Dicionaries contain key:value pairs:

rankings = {"1":"String2", "2":"String1", "3":"String3"}

then you can access the elements like:

print rankings["1"]

it will print 

"String2"

But how to create this dictionary? Use a for loop (assuming list1 and list2 have the same length)

rankings = {} # Create empy dicionary
for i in range(len(list2)): # Loop 'n' times, where 'n' is the length of the lists
    rankings[list2[i]] = list1[i]

Note: Depending in your implementation, you could just use a number, instead of a string as key in the dictionary:

rankings = {1:"String2", 2:"String1", 3:"String3"}

Upvotes: 0

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