Share a summary of python containers

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python container summary and arrangement

list

Variable array

tuple

Immutable array

dict

Dictionary of key-value pairs

Initialization:

a={‘lyt':90}

Add:

a[‘zxw']=91

Access:

1.a [key]

If it does not exist, an error will occur.

2.a.get(key)

Does not exist and returns None

3.a.get(key,val1)

Does not exist and returns the specified val1

#Judgment:

>>>key in a
True/False

Delete :

a.pop(key)

There is a corresponding val returned, and no error is reported

Note that the key must be an immutable variable, such as a string, an integer, or a tuple. Not an array.

>>> a
[1, 2, 3]
>>> b
(1, 2)
>>> d
{'lyt': 90}
>>> d[a]=99
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
TypeError: unhashable type: &#39;list&#39;
>>> d[b]=99
>>> d
{(1, 2): 99, &#39;lyt&#39;: 90}

set

A collection without duplicate keys

To create

you need to provide a list###

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