Python - Merging 3 different dictionary and grouping the output

Question

I have created 3 different dictionary in python , however I believe this cannot be merged into 1 dictionary eg NewDict due to a same Key in all 3 eg Name & Company.

NewDict1 =  {'Name': 'John,Davies', 'Company': 'Google'}
NewDict2 =  {'Name': 'Boris,Barry', 'Company': 'Microsoft'}
NewDict3 =  {'Name': 'Humphrey,Smith', 'Company': 'Microsoft'}

I would like to group above in such a way that my output is as below :

Google : John Davies Microsoft : Boris Barry, Humphrey Smith

Any help will be really appreciated .

Answer 1

Use a defaultdict :

from collections import defaultdict

dicts = [NewDict1, NewDict2, NewDict3]

out = defaultdict(list)

for d in dicts:
    out[d['Company']].append(d['Name'])
    
dict(out)

output: {'Google': ['John,Davies'], 'Microsoft': ['Boris,Barry', 'Humphrey,Smith']}

as printed string

for k,v in out.items():
    print(f'{k}: {", ".join(v)}')

output:

Google: John,Davies
Microsoft: Boris,Barry, Humphrey,Smith

Answer 2

NewDict1 =  {'Name': 'John,Davies', 'Company': 'Google'}
NewDict2 =  {'Name': 'Boris,Barry', 'Company': 'Microsoft'}
NewDict3 =  {'Name': 'Humphrey,Smith', 'Company': 'Microsoft'}
d = {}
l = [NewDict1, NewDict2, NewDict3]
for each in l:
    if each['Company'] not in d.keys():
            d[each['Company']] = []
    if each['Name'] not in d[each['Company']]:
            d[each['Company']].append(each['Name'])

Outputs:

d
{'Google': ['John,Davies'], 'Microsoft': ['Boris,Barry', 'Humphrey,Smith']}

For Plain text

output = ''
for k,v in d.items():
    v = [x.replace(',',' ') for x in v]
    output+=f" {k}:{','.join(v)}"
output = output.strip()

Print(output) and you get:

'Google:John Davies Microsoft:Boris Barry,Humphrey Smith'

Answer 3

Why don't you use a different structure for your source dictionary ? like instead of {'name': 'jack', 'company': 'google'} , go for

dict1 = {'Google': ['Jack']}
dict2 = {'Microsoft': ['Susan']}
dict3= {'Google': ['Amit']}
#then you can combine all three dict into one: 
def combine_dict(dict_1, dict_2):
  for key in dict_1:
    val = dict_1[key]
    if key in dict_2:
      dict_2[key].extend(val)
    else:
      dict_2[key] = val
  return dict_2
new_dict = combine_dict(dict1,dict2)
new_dict = combine_dict(new_dict, dict3)

this should do it