How to create multidimensional array in python from list?

Question

I have a list containing elements like

list1 = [['Test Name', 'Results', 'Units', 'Bio. Ref. Interval'], 
         ['Cholesterol, Total', '243.00', 'mg/dL', '<200.00'], 
         ['Triglycerides', '365.00', 'mg/dL', '<150.00'], 
         ['HDL Cholesterol', '48.56', 'mg/dL', '>50.00'], 
         ['LDL Cholesterol, Calculated', '121.44', 'mg/dL', '<100.00'], 
         ['VLDL Cholesterol, Calculated *', '73.00', 'mg/dL', '<30.00'], 
         ['Non-HDL Cholesterol', '194', 'mg/dL', '<130']]

I want to use list1[0] that is, ['Test Name', 'Results', 'Units', 'Bio. Ref. Interval'] to make it as key and want output something like the following multidimensional dictionary.

{
 { Testname : 'Cholesterol, Total' {
                        Result : '243.00',
                        Units :  'mg/dL',
                        Bio. Ref. Interval : '<200.00'
                    },....
  ....
 { Testname : 'Non-HDL Cholesterol' { Result : '194', Units : 'mg/dL', Bio. Ref. Interval : '<130'}}
}

I'm newbie to python. Help out please.

Do you want your key to be in one whole string: "Testname : 'Non-HDL Cholesterol'"? Your expected output is not a valid dict — Chris
– Chris, Commented Mar 5, 2020 at 5:53

alec · Accepted Answer · 2020-03-05 05:56:54Z

2

You need unique keys for the dictionary so you can do something like this:

dict1 = {f'Test {j}': {list1[0][i]: list1[j][i] for i in range(4)} for j in range(1, len(list1))}

Which will have the following output.

{'Test 1': {'Test Name': 'Cholesterol, Total', 'Results': '243.00', 'Units': 'mg/dL', 'Bio. Ref. Interval': '<200.00'},
 'Test 2': {'Test Name': 'Triglycerides', 'Results': '365.00', 'Units': 'mg/dL', 'Bio. Ref. Interval': '<150.00'},
 'Test 3': {'Test Name': 'HDL Cholesterol', 'Results': '48.56', 'Units': 'mg/dL', 'Bio. Ref. Interval': '>50.00'},
 'Test 4': {'Test Name': 'LDL Cholesterol, Calculated', 'Results': '121.44', 'Units': 'mg/dL', 'Bio. Ref. Interval': '<100.00'},
 'Test 5': {'Test Name': 'VLDL Cholesterol, Calculated *', 'Results': '73.00', 'Units': 'mg/dL', 'Bio. Ref. Interval': '<30.00'},
 'Test 6': {'Test Name': 'Non-HDL Cholesterol', 'Results': '194', 'Units': 'mg/dL', 'Bio. Ref. Interval': '<130'}}

answered Mar 5, 2020 at 5:56

alec

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1 Comment

sodmzs Over a year ago

Thank you soo much. That is what exactly I want :)

Sithija Siriwardana · Accepted Answer · 2020-03-05 05:57:52Z

2

There are several method to convert list into a dictionary.One is dict comprehension and other one is zip method.

refer this -> https://www.geeksforgeeks.org/python-convert-a-list-to-dictionary/

answered Mar 5, 2020 at 5:57

Sithija Siriwardana

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Comments

Vivek Sable · Accepted Answer · 2020-03-05 06:02:41Z

Output will be list of dictionary. Not dictionary of dictionary because we require key here.

You need to know how to iterate list and slice operation on list.
You should known how zip function works.
and append method of list.

Code:

list1 = [
    ['Test Name', 'Results', 'Units', 'Bio. Ref. Interval'], 
    ['Cholesterol, Total', '243.00', 'mg/dL', '<200.00'], 
    ['Triglycerides', '365.00', 'mg/dL', '<150.00'], 
    ['HDL Cholesterol', '48.56', 'mg/dL', '>50.00'], 
    ['LDL Cholesterol, Calculated', '121.44', 'mg/dL', '<100.00'], 
    ['VLDL Cholesterol, Calculated *', '73.00', 'mg/dL', '<30.00'], 
    ['Non-HDL Cholesterol', '194', 'mg/dL', '<130']
]

# Output will be list of dictionary. Not dictionary of dictionary because we require key here.

keys = list1[0]

output_list = []
for item in list1[1:]:
    _tmp = {}
    for key, value in zip(keys, item):
        _tmp[key] = value
    output_list.append(_tmp)

print("output_list:", output_list)

List Comprehension:

output_list = [dict(zip(keys, item)) for item in list1[1:]]

print("output_list:", output_list)

HerculesOfHell · Accepted Answer · 2020-03-05 06:03:03Z

1

The requested output cannot be a dictionary(since there are no keys mentioned) but rather list of dictionaries only.

my_list_of_dictionaries = [{k:i[list1[0].index(k)] for k in list1[0]} for i in list1[1:]]

answered Mar 5, 2020 at 6:03

HerculesOfHell

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