Python container summary and python container Summary

Python container summary and python container Summary

Python container Summary

List

Variable Array

Tuple

Immutable Array

Dict

Dictionary of key-value pairs)

Initialization:

a={‘lyt':90}

Add:

a[‘zxw']=91

Access:

1. a [key]

Error if not found

2. a. get (key)

None returned if no data exists

3. a. get (key, val1)

The specified val1 is not returned.

#### Judgment:

>>>key in aTrue/False

Delete:

a.pop(key) 

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

Note that the key must be a non-variable, such as a string, integer, or tuples. Cannot be an array.

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

Set

Set Without Duplicate keys

Create

A list is required.

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