Converting an array to hash in python

Question

Trying to convert an list to dictionary but could no get expected output

p = {}
a = ["s","l","y"]
for s in a:
    p["size"] = s

print(p)

output:

{'size': 'y'}

but i am expecting output like this

{'size': 's','size': 'l','size': 'y'}

how could i acheive this in python

Yeah that's just not going to work as itzmeontv said. What is it that you're trying to do with the data? — MikkoP
– MikkoP, Commented Apr 8, 2015 at 8:05
Suppose you have the dict p you're trying to create, and you do p['size']. What do you want to happen? — user2357112
– user2357112, Commented Apr 8, 2015 at 8:11
If my answer answered your question. Please think of accepting it. Thanks! — aldeb
– aldeb, Commented Apr 8, 2015 at 8:21

pnv · Accepted Answer · 2015-04-08 08:21:01Z

2

You can't have multiple same keys in a dictionary, so you can use a list of dictionaries. A simple list comprehension should do the trick.

p = [{'size': a_size} for a_size in a]

Result :

[{'size': 's'}, {'size': 'l'}, {'size': 'y'}]

answered Apr 8, 2015 at 8:21

pnv

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1 Comment

pnv Over a year ago

You people should wait for a sec before down-voting anything. Let, the guy edit some stuff.

aldeb · Accepted Answer · 2015-04-08 08:05:21Z

1

You can't achieve your goal since you are using a dictionary, and each key in a dictionary is unique. Perhaps you want to use a list instead:

p = []
a = ['s', 'l', 'y']
for s in a:
    p.append(('size',  s))

print(p)

Output:

[('size', 's'), ('size', 'l'), ('size', 'y')]

answered Apr 8, 2015 at 8:05

aldeb

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1 Comment

DaNNuN Over a year ago

With this answer we converted a list into a list of nested tuples which doesn't match the dictionary as requested.

DaNNuN · Accepted Answer · 2018-08-24 22:16:57Z

0

The following code should be a clean solution.

p = {}
a = ["s", "l","y"]
for s in a:
    if s == "s":
        p["small-size"] = s
    elif s == "l":
        p["large-size"] = s
    else:
        p["youth-size"] = s

print(p)

With the following output:

{'small-size': 's', 'large-size': 'l', 'youth-size': 'y'}

answered Aug 24, 2018 at 22:16

DaNNuN

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