CODEWITHSUNDEEP
python
Okeh
Okeh

Reputation: 163

Manipulation of two lists

Say I have a list with single length elements;

['z', 'x', 'y']

And another list with two length elements;

[('x', 7), ('y', 1), ('z', 5)]

How can I rearrange the second list so that the first elements of it(i.e. x, y, z...) are in the exact order of those in the first list (i.e. z, x, y) so that I get an output;

[('z', 5), ('x', 7), ('y', 1)]

Upvotes: 0

Views: 99

Answers (2)

Selcuk
Selcuk

Reputation: 59315

You can use this method:

>>> list1 = ['z', 'x', 'y']
>>> list2 = [('x', 7), ('y', 1), ('z', 5)]
>>> dict2 = dict(list2)
>>> new_list = [(key, dict2[key]) for key in list1]
>>> new_list
[('z', 5), ('x', 7), ('y', 1)]

Upvotes: 0

Alex Taylor
Alex Taylor

Reputation: 8853

The second list can be trivially transformed into a dictionary, then list comprehensions make it trivial:

a = ['z', 'x', 'y']
b = dict([('x', 7), ('y', 1), ('z', 5)])
c = [(key, b[key]) for key in a]

Upvotes: 2

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