Python dictionary comprehension 🕮

Python dictionary comprehension tutorial example explained

#python #dictionary #comprehension

# -------------------------------------------------------------------------
# dictionary comprehension = create dictionaries using an expression
# can replace for loops and certain lambda functions
#
# dictionary = {key: expression for (key,value) in iterable}
# dictionary = {key: expression for (key,value) in iterable if conditional}
# dictionary = {key: (if/else) for (key,value) in iterable}
# dictionary = {key: function(value) for (key,value) in iterable}
# -------------------------------------------------------------------------
cities_in_F = {'New York': 32, 'Boston': 75, 'Los Angeles': 100, 'Chicago': 50}
cities_in_C = {key: round((value-32)*(5/9)) for (key,value) in cities_in_F.items()}
print(cities_in_C)

# -------------------------------------------------------------------------
# weather = {'New York': "snowing", 'Boston': "sunny", 'Los Angeles': "sunny", 'Chicago': "cloudy"}
# print(sunny_weather)

# -------------------------------------------------------------------------

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[BroCodez]

# dictionary comprehension = create dictionaries using an expression
# can replace for loops and certain lambda functions
#
# dictionary = {key: expression for (key, value) in iterable}
# dictionary = {key: expression for (key, value) in iterable if conditional}
# dictionary = {key: (if/else) for (key, value) in iterable}
# dictionary = {key: function(value) for (key, value) in iterable}
#
cities_in_F = {'New York': 32, 'Boston': 75, 'Los Angeles': 100, 'Chicago': 50}
cities_in_C = {key: round((value-32)*(5/9)) for (key, value) in cities_in_F.items()}
print(cities_in_C)

#
# weather = {'New York': "snowing", 'Boston': "sunny", 'Los Angeles': "sunny", 'Chicago': "cloudy"}
# sunny_weather = {key: value for (key, value) in weather.items() if value == "sunny"}
# print(sunny_weather)

#
# cities = {'New York': 32, 'Boston': 75, 'Los Angeles': 100, 'Chicago': 50}
# desc_cities = {key: ("WARM" if value >= 40 else "COLD") for (key, value) in cities.items()}
# print(desc_cities)

#
# def check_temp(value):
# if value >= 70:
# return "HOT"
# elif 69 >= value >= 40:
# return "WARM"
# else:
# return "COLD"


# cities = {'New York': 32, 'Boston': 75, 'Los Angeles': 100, 'Chicago': 50}
# desc_cities = {key: check_temp(value) for (key, value) in cities.items()}
# print(desc_cities)

#

[razvanandreivalcu]

Nice job. I'm learning python and this vid was just what I needed for an assignment. I understand list/dictionary comprehensions now, awesome. Thank you for your work!

[piotrkopcewicz]

as ususal the best content delivered to us, thx !!!

[InfameKato]

Woow, that is the most comprehensive comprehension of dictionary comprehensions that I have comprehensively watched so far!
Kudos! Thank you so much!

[milo_andrs]

Wow, I became enlightened, thank you, great video.

[adamg]

This formula might be useful if you want to create a new dictionary with different both keys and values:

dictionary = {expression1(key) (if/else) : expression2(value) (if/else) for (key, value) in iterable}

Example:

A = {'a':1, 'b':2, 'c':3}

B = {key.upper() : (value**2) for (key, value) in A.items()}

print(A)
output: {'a': 1, 'b': 2, 'c': 3}
print(B)
output: {'A': 1, 'B': 4, 'C': 9}

[fredericoamigo]

Awesome! I didn’t know that this existed! I’m definitely going to use this more in my code!

[RobloxBedwarsPlayer]

Thank you very much for this tutorial, it's very short and i learned a lot of things 😄

[bryce]

Bro code you are the best! Thanks for sharing all you're knowledge and making everything simple

[TheZKes]

Welp. Your explaination for an comprehensions is more clear for me (the guy who knows english on intermediate level) than explanations in my university in my native language.
Thank you Bro dude.

[dinceryildirim]

Very nice tutorial. Thanks a lot. This is my first video in this channel. I liked this channel and will watch all Python videos.