CODEWITHSUNDEEP
pythondictionary
JSwordy
JSwordy

Reputation: 169

Switching Dictionary Keys

I have 2 Dictionaries, they both contain the same keys (or they would with a little cutting, [3:]) but different values. I would like to replace the keys in one dictionary with the values of another. For example here is a portion of my lists:

Dict 1

 "AED":"United Arab Emirates Dirham",
 "AFN":"Afghan Afghani",
 "ALL":"Albanian Lek",
 "AMD":"Armenian Dram",
 "ANG":"Netherlands Antillean Guilder",
 "AOA":"Angolan Kwanza",
 "ARS":"Argentine Peso"

Dict2

 "USDAED":3.672301,
 "USDAFN":66.800003,
 "USDALL":127.000221,
 "USDAMD":486.160004,
 "USDANG":1.769942,
 "USDAOA":165.080994,
 "USDARS":15.609965

I would like a list with the first entry reading "United Arab Emirates Dirham":3.672301 Any thoughts? Please let me know. Thank you!

Upvotes: 1

Views: 70

Answers (3)

RomanPerekhrest
RomanPerekhrest

Reputation: 92854

To change/update the first dictionary use dict.update() function:

# d1 and d2 are the first and the second dicts respectively
d1.update({k[3:]:v for k,v in d2.items()})
print(d1)

The output:

{'AFN': 66.800003, 'AOA': 165.080994, 'AED': 3.672301, 'ALL': 127.000221, 'ARS': 15.609965, 'AMD': 486.160004, 'ANG': 1.769942}

Upvotes: 0

blue note
blue note

Reputation: 29081

dict2 = {dict1[key[3:]], value for key, value in dict2.items()

Upvotes: 0

Jean-François Fabre
Jean-François Fabre

Reputation: 140186

Do that with a one-liner (dict comprehension)

dict1={"AED":"United Arab Emirates Dirham",
 "AFN":"Afghan Afghani",
 "ALL":"Albanian Lek",
 "AMD":"Armenian Dram",
 "ANG":"Netherlands Antillean Guilder",
 "AOA":"Angolan Kwanza",
 "ARS":"Argentine Peso"}

dict2 = {"USDAED":3.672301,
 "USDAFN":66.800003,
 "USDALL":127.000221,
 "USDAMD":486.160004,
 "USDANG":1.769942,
 "USDAOA":165.080994,
 "USDARS":15.609965}

dict3 = {dict1[x[3:]]:y for x,y in dict2.items()}

print(dict3)

yields:

{'Albanian Lek': 127.000221, 'Netherlands Antillean Guilder': 1.769942,
 'Armenian Dram': 486.160004, 'United Arab Emirates Dirham': 3.672301, 
'Afghan Afghani': 66.800003, 'Argentine Peso': 15.609965,
'Angolan Kwanza': 165.080994}

The code recreates a third dictionary with as key: values of the first one (with the small key cutoff you mentionned, and as values: values of the second one

Note: as dicts are not ordered your "first entry" wish doesn't hold, unless you print the items sorted of course.

Upvotes: 3

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