If branch depending on whether there is a specific element in the list

#!/usr/bin/python
# -*- coding:utf-8 -*-

#Appropriate list for the time being
list = ['dog', 'cat', 'bird']

#Element to be a branch condition
a = 'dog'

"""
a in list is true(The element of a is included in the list)If it is, if is executed, if false, else is executed.
It can also be written as a not in list, and it is true if a is not included in the list.
"""
if a in list:
    print 'if_do'
else:
    print 'else_do'

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