How to get key filtered by its value in multidimensional array Python

Question

I got this data

employee_detail_list = {
      'John Doe': {
          'name': 'EMP-0001',
          'first_name': 'John',
          'last_name': 'Doe',
          'full_name': 'John Doe',
          'company': 'Company 1'
      },
      'Tom Smith': {
          'name': 'EMP-0002',
          'first_name': 'Tom',
          'last_name': 'Smith',
          'full_name': 'Tom Smith',
          'company': 'Company 2'
      },
      'Andrew Sebastian': {
          'name': 'EMP-0003',
          'first_name': 'Andrew',
          'last_name': 'Sebastian',
          'full_name': 'Andrew Sebastian',
          'company': 'Company 2'
      },   }

i want output

Tom Smith
Andrew Sebastian

by filtering value "Company 2", i’ve try this code:

# list out keys and values separately
key_list = list(employee_detail_list.keys())
val_list = list(employee_detail_list.values())

# print key with val Company 2
position = val_list.index("Company 2")
print(key_list[position])

but always ended up with this error:

ValueError: 'Company 2' is not in list

any thought what is wrong? thanks before

Asked By: Fahmi Sabila Dinnulhaq

||

Source

Answer 1

It does what you need. .items() returns data as iterable objects that can be traversed.

for key, value in employee_detail_list.items():
    if value["company"] == "Company 2":
        print(key)

# Output
Tom Smith
Andrew Sebastian

The problem with your solution is that val_list = list(employee_detail_list.values()) returns a list with objects and you are trying to find val_list.index("Company 2") by string which is not there

Answered By: Devid Mercer

Answer 2

You can use filter()

employee_detail_list = {
      'John Doe': {
          'name': 'EMP-0001',
          'first_name': 'John',
          'last_name': 'Doe',
          'full_name': 'John Doe',
          'company': 'Company 1'
      },
      'Tom Smith': {
          'name': 'EMP-0002',
          'first_name': 'Tom',
          'last_name': 'Smith',
          'full_name': 'Tom Smith',
          'company': 'Company 2'
      },
      'Andrew Sebastian': {
          'name': 'EMP-0003',
          'first_name': 'Andrew',
          'last_name': 'Sebastian',
          'full_name': 'Andrew Sebastian',
          'company': 'Company 2'
      }
}

def isFromCompany2(data):
    return data["company"] == "Company 2"

result = filter(isFromCompany2, employee_detail_list.values())

print(list(result))

This is a nice article that explains it https://realpython.com/python-filter-function/

Answered By: notrev

How to get key filtered by its value in multidimensional array Python

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