Use the fromkeys () method for dictionary operations in Python

Use the fromkeys () method for dictionary operations in Python

This article mainly introduces how to use the fromkeys () method for dictionary operations in Python. It is the basic knowledge for getting started with Python. For more information, see

The fromkeys () method sets the sequence key and value to create a new dictionary.

Syntax

The syntax of the fromkeys () method is as follows:

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1	Dict. fromkeys (seq [, value])

Parameters

Seq -- this is a list of values that will be used for dictionary key preparation.

Value -- this is optional. If it is provided, the value is set to this value.

Return Value

This method returns a list.

Example

The following example shows how to use the fromkeys () method.

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#! /Usr/bin/python   Seq = ('name', 'age', 'sex ')   Dict = dict. fromkeys (seq) Print "New Dictionary: % s" % str (dict)   Dict = dict. fromkeys (seq, 10) Print "New Dictionary: % s" % str (dict)

When we run the above program, it will produce the following results:

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1 2	New Dictionary: {'age': None, 'name': None, 'sex': None} New Dictionary: {'age': 10, 'name': 10, 'sex': 10}