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HOW TO GET FIRST KEY VALUE IN A DICTIONARY

July 28, 2022July 27, 2022 by Kat McKelvie
3.3/5 - (10 votes)


PROBLEM FORMULATION AND SOLUTION OVERVIEW

In this article, you’ll learn how to get the first Key and Value from a
key:value pair in a Python Dictionary.

A Dictionary in Python is used to store information in a key:value pair format.
These pairs are modifiable and do not allow duplicates.

Note: In theory, the dictionary data type doesn’t provide any guarantee of
ordering. In other words, there should be no such thing as getting the “first
value” of a dictionary. If your application relies on the ordering of dictionary
elements, I’d recommend using the OrderedDict type. In practice, however, things
are different because dictionaries, in fact, keep the elements ordered in the
cPython implementation of the Python specification. You cannot rely on it,
though.

To make it more fun, we have the following running scenario:

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Noah has decided to take his family on a fun getaway. He has a list of five (5)
possible choices. After much ado, a vote was taken, and the first location was
selected as the winner. Where is the family going (Key)? What are they staying
in (Value)?

--------------------------------------------------------------------------------

Question: How would we write code to get the first key:value pair in a Python
Dictionary?

We can accomplish this task by one of the following options:

 * Method 1: Use dict.items()
 * Method 2: Use dict.keys() and dict.values()
 * Method 3: Use next()
 * Method 4: Use a for loop and dict.items()
 * Method 5: Use Dictionary Comprehension



--------------------------------------------------------------------------------


METHOD 1: USE DICT.ITEMS()

This method uses dict.items() to access and retrieve the first key:value pair in
a Dictionary.

Plain text
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EnlighterJS 3 Syntax Highlighter
getaways = {'Switzerland': 'Windmill', 'Canada': 'Igloo', 'Sweden': 'Treehouse',
'US': 'Lighthouse'}
winner = list(getaways.items())
print(winner)
getaways = {'Switzerland': 'Windmill', 'Canada': 'Igloo', 'Sweden': 'Treehouse',
'US': 'Lighthouse'} winner = list(getaways.items()) print(winner)


getaways = {'Switzerland': 'Windmill', 'Canada': 'Igloo',  'Sweden': 'Treehouse', 'US': 'Lighthouse'}
winner = list(getaways.items())
print(winner)

Above, declares four (4) possible getaways, with the Dictionary Key indicating
the location and the Value indicating the accommodations. These save to
getaways.

The following line converts getaways (list(getaways.items()) to a List and
returns a List of Tuples as shown below.

[('Switzerland', 'Windmill'), ('Canada', 'Igloo'), ('Sweden', 'Treehouse'),
('US', 'Lighthouse')]

To access the first key:value pair, slicing was used to access the Tuple.

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EnlighterJS 3 Syntax Highlighter
winner = list(getaways.items())[0]
print(winner)
winner = list(getaways.items())[0] print(winner)


winner = list(getaways.items())[0]
print(winner)

('Switzerland', 'Windmill')

To access the Key and Value individually, slicing was used once again.

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EnlighterJS 3 Syntax Highlighter
winner = list(getaways.items())[0][0]
print(winner)

winner = list(getaways.items())[0][1]
print(winner)
winner = list(getaways.items())[0][0] print(winner) winner =
list(getaways.items())[0][1] print(winner)



winner = list(getaways.items())[0][0]
print(winner)

winner = list(getaways.items())[0][1]
print(winner)

Switzerland
Windmill

Python dict.items() Method



Watch this video on YouTube


--------------------------------------------------------------------------------


METHOD 2: USE DICT.KEYS() AND DICT.VALUES()

This method uses dict.keys() and dict.values() to access and retrieve the first
key:value pair in a Dictionary.

Plain text
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EnlighterJS 3 Syntax Highlighter
getaways = {'Switzerland': 'Windmill', 'Canada': 'Igloo', 'Sweden': 'Treehouse',
'US': 'Lighthouse'}
first_key = list(getaways.keys())[0]
first_val = list(getaways.values())[0]
print(f'Noah and his family are going to {first_key} and staying in a
{first_val}.')
getaways = {'Switzerland': 'Windmill', 'Canada': 'Igloo', 'Sweden': 'Treehouse',
'US': 'Lighthouse'} first_key = list(getaways.keys())[0] first_val =
list(getaways.values())[0] print(f'Noah and his family are going to {first_key}
and staying in a {first_val}.')


getaways = {'Switzerland': 'Windmill', 'Canada': 'Igloo',  'Sweden': 'Treehouse', 'US': 'Lighthouse'}
first_key = list(getaways.keys())[0]
first_val = list(getaways.values())[0]
print(f'Noah and his family are going to {first_key} and staying in a {first_val}.')

Above, declares four (4) possible getaways, with the Dictionary Key indicating
the location and the Value indicating the accommodations. These save to
getaways.



The following two (2) lines access the first Key and the first Value using
slicing. These save respectively to first_key and first_val.

Next, a formatted string is output to the terminal.

Noah and his family are going to Switzerland and staying in a Windmill.

Python dict.keys() Method



Watch this video on YouTube


--------------------------------------------------------------------------------


METHOD 3: USE NEXT()

For this method, only the Value of the first key:value pair, is retrieved.

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getaways = {'Switzerland': 'Windmill', 'Canada': 'Igloo', 'Sweden': 'Treehouse',
'US': 'Lighthouse'}
all_vals = getaways.values()
val_iter = iter(all_vals)
first_val = next(val_iter)
print(f'Noah and his family are staying in a {first_val}. The location is a
secret!')
getaways = {'Switzerland': 'Windmill', 'Canada': 'Igloo', 'Sweden': 'Treehouse',
'US': 'Lighthouse'} all_vals = getaways.values() val_iter = iter(all_vals)
first_val = next(val_iter) print(f'Noah and his family are staying in a
{first_val}. The location is a secret!')


getaways = {'Switzerland': 'Windmill', 'Canada': 'Igloo',  'Sweden': 'Treehouse', 'US': 'Lighthouse'}
all_vals = getaways.values()
val_iter = iter(all_vals)
first_val = next(val_iter)
print(f'Noah and his family are staying in a {first_val}. The location is a secret!')

Above, declares four (4) possible getaways, with the Dictionary Key indicating
the location and the Value indicating the accommodations. These save to
getaways.



The following three (3) lines retrieve all the Dictionary Values, convert them
to an object, retrieve the first Value and output a formatted string to the
terminal.

Noah and his family are staying in a Windmill. The location is a secret!

Python Dictionary values() Method



Watch this video on YouTube


--------------------------------------------------------------------------------


METHOD 3: USE A FOR LOOP AND DICT.ITEMS()

This method uses a for Loop and dict.items() to output the first key:value pair
in a Dictionary.

Plain text
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EnlighterJS 3 Syntax Highlighter
getaways = {'Switzerland': 'Windmill', 'Canada': 'Igloo', 'Sweden': 'Treehouse',
'US': 'Lighthouse'}
for k, v in getaways.items():
print(k, v)
exit()
getaways = {'Switzerland': 'Windmill', 'Canada': 'Igloo', 'Sweden': 'Treehouse',
'US': 'Lighthouse'} for k, v in getaways.items(): print(k, v) exit()


getaways = {'Switzerland': 'Windmill', 'Canada': 'Igloo',  'Sweden': 'Treehouse', 'US': 'Lighthouse'}
for k, v in getaways.items():
  print(k, v)
  exit()

Above, declares four (4) possible getaways, with the Dictionary Key indicating
the location and the Value indicating the accommodations. These save to
getaways.



The next line instantiates a For loop to iterate through the Dictionary items.

Then, the first Key and Value are output to the terminal, and the loop
terminates.

Switzerland Windmill

--------------------------------------------------------------------------------


METHOD 5: USE DICTIONARY COMPREHENSION

Dictionary Comprehension! A simplistic approach!

Plain text
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EnlighterJS 3 Syntax Highlighter
getaways = {'Switzerland': 'Windmill', 'Canada': 'Igloo', 'Sweden': 'Treehouse',
'US': 'Lighthouse'}
winner = {k: getaways[k] for k in list(getaways)[:1]}
print(winner)
getaways = {'Switzerland': 'Windmill', 'Canada': 'Igloo', 'Sweden': 'Treehouse',
'US': 'Lighthouse'} winner = {k: getaways[k] for k in list(getaways)[:1]}
print(winner)


getaways = {'Switzerland': 'Windmill', 'Canada': 'Igloo',  'Sweden': 'Treehouse', 'US': 'Lighthouse'}
winner = {k: getaways[k] for k in list(getaways)[:1]}
print(winner)

Above, declares four (4) possible getaways, with the Dictionary Key indicating
the location and the Value indicating the accommodations. These save to
getaways.

Next, Dictionary Comprehension is used in conjunction with slicing to retrieve
only the first Key and Value in the Dictionary and output the same to the
terminal. Perfect!

{'Switzerland': 'Windmill'}

Python Dictionary Comprehension - A Powerful One-Liner Tutorial



Watch this video on YouTube



A Finxter Favorite!
Simple! Yet Elegant!

--------------------------------------------------------------------------------


SUMMARY

These five (5) methods of retrieving the first Key and Value pair of a
Dictionary should give you enough information to select the best one for your
coding requirements.

Good Luck & Happy Coding!

--------------------------------------------------------------------------------


PROGRAMMER HUMOR – BLOCKCHAIN

“Blockchains are like grappling hooks, in that it’s extremely cool when you
encounter a problem for which they’re the right solution, but it happens way too
rarely in real life.” source – xkcd




Kat McKelvie

At university, I found my love of writing and coding. Both of which I was able
to use in my career.

During the past 15 years, I have held a number of positions such as:

In-house Corporate Technical Writer for various software programs such as
Navision and Microsoft CRM
Corporate Trainer (staff of 30+)
Programming Instructor
Implementation Specialist for Navision and Microsoft CRM
Senior PHP Coder




Categories Data Structures, Python, Python Dictionary

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