从字典中提取值以在Python中列出

Question

I have below dictionary in Python, and I would like to extract the value of "red" and apeend it to a list. I have the dictionary store in the variable "Reference" as per below:

Reference = {
    u'Message': u'', 
    u'Code': 0, 
    u'Data': [{u'Status': u'Running', u'InternalReferenceNumber': u'25333342818',  u'Currency': u'EUR', u'red': u'WA-1a9asd4sdfdas, u'PnlInfo': None},  
              {u'Status': u'Running', u'InternalReferenceNumber': u'25333342818',  u'Currency': u'EUR', u'red': u'WA-150824979asd4', u'PnlInfo': None}, 
              {u'Status': u'Running', u'InternalReferenceNumber': u'25333342818',  u'Currency': u'EUR', u'red': u'WA-1508249792364', u'PnlInfo': None}]
}

I have tried below code but somehow I do not achieve to get below output (ie a list with the value extracted from the dictionary for the key "red":

results = [WA-1a9asd4sdfdas,WA-150824979asd4,WA-1508249792364]

Code:

results = [ item['BetPlacementReference'] for item in Reference]
print results

Could you please advise how to get the desired list?

Thanks.

Answer 1

Try this:

results = [item['red'] for item in Reference['Data']]

Honestly, I have no clue, why you try to find anthing with a key 'BetPlacementReference' in your data :)

Answer 2

Just do :

>>> out = []
>>> for ele in Reference['Data']: 
        out.append(ele['red']) 

>>> out
=> ['WA-1a9asd4sdfdas', 'WA-150824979asd4', 'WA-1508249792364']

Or, a single liner using List comprehension :

>>> [ ele['red'] for ele in Reference['Data'] ]
=> ['WA-1a9asd4sdfdas', 'WA-150824979asd4', 'WA-1508249792364']

Answer 3

What you could use to get the value of red for a certain point in data where 0 is the dictionary within the list:

Reference['Data'][0]['red']

This works because Data is subscriptable and so is each dictionary within the list. To make it loop for every value we need to do:

red_list = []
for ref_dict in Reference['Data']:
    red_list.append(ref_dict['red'])

This will go through every part of Data in Reference adding the value of red to red_list .