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Setting a default attribute value in Python

Classes
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schedule Jul 1, 2022
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It is possible to set a default value for an attribute when defining a class.

Example

Below we have a class Concert, where the attribute tickets_remaining of each instance always starts at 5000 when the particular concert is announced.

To define the class Concert with default value of attribute tickets_remaining of 5000:

class Concert:

def __init__(self, singer, date):
self.singer = singer
self.date = date
self.tickets_remaining = 5000

def update_tickets_remaining(self, remaining):
self.tickets_remaining = remaining

Notice that we do not have to provide a value for tickets_remaining when instantiating the object:

acdc = Concert('acdc', '2020-06-01')
print(acdc.tickets_remaining)
5000
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Published by Arthur Yanagisawa
Edited by 0 others
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