[Introduction to Udemy Python3 + Application] 24. Dictionary type

** * This article is from Udemy "[Introduction to Python3 taught by active Silicon Valley engineers + application + American Silicon Valley style code style](https://www.udemy.com/course/python-beginner/" Introduction to Python3 taught by active Silicon Valley engineers + application + American Silicon Valley style code style ")" It is a class notebook for myself after taking the course of. It is open to the public with permission from the instructor Jun Sakai. ** **

■ Dictionary type

◆ Registration
>>> d = {'x': 10, 'y': 20}
>>> d
{'x': 10, 'y': 20}
>>> type(d)
<class 'dict'>

By enclosing it with {}, it becomes a dictionary type.

◆ Call
>>> d = {'x': 10, 'y': 20}
>>> d['x']
10
>>> d['y']
20

You can search the contents of the dictionary by using [].


■ Rewrite to a new value

>>> d = {'x': 10, 'y': 20}
>>> d['x'] = 100
>>> d
{'x': 100, 'y': 20}

The value of the specified key can be rewritten with a new value.


■ Add a new key

>>> d = {'x': 10, 'y': 20}
>>> d['z'] = 100
>>> d
{'x': 10, 'y': 20, 'z': 100}

You can also add a new key.


■ Another registration method

>>> dict(a = 10, b = 20)
{'a': 10, 'b': 20}
>>> dict([('a', 10), ('b', 20)])
{'a': 10, 'b': 20}

for your information.

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