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Learn how to write a Python dictionary and recognize and create key:value pairs.
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In this video, we're going to discuss
the syntax for writing dictionaries and
0:00
learning more about key value pairs.
0:04
Just like lists are wrapped
in square brackets,
0:07
dictionaries are wrapped in curly braces.
0:09
Each element inside the curly
braces is a key value pair,
0:12
separated from the previous by a comma.
0:15
A key is a label or an identifier for
its associated value.
0:18
For instance, if I'm using a dictionary
to model or store data about myself,
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and one piece of data I want to include
is my name, I create a key-value pair
0:27
where the key is the string name,
and the value is the string Ashley.
0:32
I could also use a key-value
pair to store my profession.
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Storing key value pairs in a dictionary
allows you to group related data together
0:41
and keep it organized.
0:45
Unlike a list or a tuple, the order of
the key value pairs doesn't matter.
0:47
It does however matter
that the keys be unique.
0:51
If you add a key value pair to your
dictionary that uses a duplicate key,
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the original value associated
with that key will be forgotten.
0:58
Keys can be any immutable type,
strings, integers, even tuples, but
1:02
only if every item in
the tuple is also immutable.
1:07
Values can be any type.
1:10
Dictionaries can also grow or
1:12
shrink as needed, key value pairs
can always be added or deleted.
1:14
Now that you know a little bit about how
to write a dictionary, join me in the next
1:18
video to learn about accessing
data that's inside the dictionary.
1:22
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