python variable type-practical application and analysis of dictionary

In this article, we will learn about the dictionary among Python variable types. This is a variable type that we often use in actual combat. I hope this article can provide some help to you who have just come into contact with python.

python dictionary:

Dictionary (dictionary) is the most flexible built-in data structure type in Python besides lists. A list is an ordered collection of objects, and a dictionary is an unordered collection of objects.

The difference between the two is that the elements in the dictionary are accessed through keys, not offsets.

Dictionaries are identified with "{ }". A dictionary consists of an index (key) and its corresponding value.

We can use an example to understand:

#!/usr/bin/python
# -*- coding: UTF-8 -*-
 
dict = {}
dict['one'] = "This is one"
dict[2] = "This is two"
 
tinydict = {'name': 'john','code':6734, 'dept': 'sales'}
 
 
print dict['one']          # 输出键为'one' 的值
print dict[2]              # 输出键为 2 的值
print tinydict             # 输出完整的字典
print tinydict.keys()      # 输出所有键
print tinydict.values()    # 输出所有值

The output result of the above example is:

This is one
This is two
{'dept': 'sales', 'code': 6734, 'name': 'john'}
['dept', 'code', 'name']
['sales', 6734, 'john']

Through the above examples to understand the dictionary in python, I hope this article can provide some help to you who have just come into contact with python.

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