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Python dictionary is another mutable container model and can store any type of object, such as strings, numbers, tuples and other container models.
1. Create a dictionary
A dictionary consists of pairs of keys and corresponding values. Dictionaries are also called associative arrays or hash tables. The basic syntax is as follows:
dict = {'Alice': '2341', 'Beth': '9102', 'Cecil': '3258'}
You can also create a dictionary like this
dict1 = { 'abc': 456 } dict2 = { 'abc': 123, 98.6: 37 }
Note:
Each key and value are separated by a colon (:), each pair is separated by a comma, and each pair is separated by a comma. Split and place the whole in curly braces ({}).
Keys must be unique, but values do not.
The value can be of any data type, but it must be immutable, such as string, number or tuple.
Modify the dictionary:
The way to add new content to the dictionary is to add new key/value pairs, modify or delete existing key/value pairs as follows:
dict = {'Name': 'Zara', 'Age': 7, 'Class': 'First'}; dict['Age'] = 8; # update existing entry dict['School'] = "DPS School"; # Add new entry print "dict['Age']: ", dict['Age']; print "dict['School']: ", dict['School']; #以上实例输出结果: #dict['Age']: 8 #dict['School']: DPS School
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