Get list from list values in a python dictionary

Question

I have a python dictionary with the following entries:

professions = {Peasant : ["Peasant", 10000], Merchant : ["Merchant", 15000], ...}

Where the keys are id's. Is there a clever way to get a list of the first entries of the value lists? I'd like a function that returns:

["Peasant", "Merchant", ...]

thanks for suggestions

Why can't you use the dict keys? Why are the keys repeated in the list values? — Daniel Roseman
– Daniel Roseman, Commented Sep 29, 2013 at 20:21
I think what @DanielRoseman is asking is what's the point of the first element in each list? They are the same as the key, so why not just have professions = {"Peasant": 10000, ...}? — SethMMorton
– SethMMorton, Commented Sep 29, 2013 at 20:51

Daniel Roseman · Accepted Answer · 2013-09-29 20:24:05Z

2

The question is quite under-specified, but presuming what you want to do is to extract the first value in each list, it would be:

names = [v[0] for v in professions.values()]

answered Sep 29, 2013 at 20:24

Daniel Roseman

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3 Comments

anhoppe Over a year ago

Jup, that's what I wanted. Thanks

flup Over a year ago

@anhoppe the more concrete way to say that is to accept the answer :)

anhoppe Over a year ago

;-) will do, but have to wait 10min

Emil Davtyan · Accepted Answer · 2013-09-29 20:24:41Z

1

Maybe this is what you are looking for :

[value[0] for value in professions.values()]

answered Sep 29, 2013 at 20:24

Emil Davtyan

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Comments

Nacib Neme · Accepted Answer · 2013-09-29 20:22:22Z

0

If you mean to retrieve all keys of the dict: professions.keys()

Example:

professions = {Peasant : ["Peasant", 10000], Merchant : ["Merchant", 15000]}

print(professions.keys()) #["Peasant", "Merchant"]

answered Sep 29, 2013 at 20:22

Nacib Neme

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Comments

René Höhle · Accepted Answer · 2013-09-29 20:39:48Z

0

Use the .values() method

professions.values()

edited Sep 29, 2013 at 20:39

René Höhle

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answered Sep 29, 2013 at 20:21

androiddev19

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2 Comments

anhoppe Over a year ago

Without having it tried: wouldn't .values() just return the lists [["Peasant", 1000], ["Merchant", 15000]] ?

androiddev19 Over a year ago

yes, you would have to loop through and get list[x][0] where list is the returned list, and x is each list index.

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