CODEWITHSUNDEEP
pythonarraysdictionary
Zouhair
Zouhair

Reputation: 651

convert array to dict

I want to convert a list to a dictionary:

products=[['1','product 1'],['2','product 2']]
arr=[]
vals={}
for product in products:
    vals['id']=product[0]
    vals['name']=product
    arr.append(vals)
print str(arr)

The result is 

[{'id': '2', 'name': 'product 2'}, {'id': '2', 'name': 'product 2'}]

But I want something thing like that:

[{'id': '1', 'name': 'product 1'}, {'id': '2', 'name': 'product 2'}]

Upvotes: 7

Views: 32101

Answers (4)

klasske
klasske

Reputation: 2174

products=[['1','product 1'],['2','product 2']]
arr=[{'id':a[0], 'name': a[1]} for a in products]

print str(arr)

Would also work

Upvotes: 2

user3960432
user3960432

Reputation:

For simplicity sake you could also make this into a one liner:

products=[['1','product 1'],['2','product 2']]
arr= [{"id":item[0], "name":item[1]} for item in products]

Which yields:

[{'id': '1', 'name': 'product 1'}, {'id': '2', 'name': 'product 2'}]

Upvotes: 3

vertazzar
vertazzar

Reputation: 1063

products=[['1','product 1'],['2','product 2']]
arr=[]
for product in products:
    vals = {}
    for i, n in enumerate(['id', 'name', ....]): # to make it more dynamic?
      vals[n]=product[i]
    arr.append(vals)

or just use [0], [1] like stated in previous post

Upvotes: 0

TheSoundDefense
TheSoundDefense

Reputation: 6935

What you need to do is create a new dictionary for each iteration of the loop.

products=[['1','product 1'],['2','product 2']]
arr=[]
for product in products:
    vals = {}
    vals['id']=product[0]
    vals['name']=product[1]
    arr.append(vals)
print str(arr)

When you append an object like a dictionary to an array, Python does not make a copy before it appends. It will append that exact object to the array. So if you add dict1 to an array, then change dict1, then the array's contents will also change. For that reason, you should be making a new dictionary each time, as above.

Upvotes: 6

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