Python attributes from variables? [duplicate]

Question

I want to set x from variables in self.x. For example

for i in range(72)
    self.("entry" + "%s" %(i)) = None

Briefly i want to set all entry1, entry2, ... ,entry72 to None like this in short way.

self.entry1 = None
self.entry2 = None
self.entry3 = None
self.entry4 = None
.
.
self.entry72 = None

in short way. But i take

        print self.("entry" + "%s" %(i))
               ^
SyntaxError: invalid syntax

How to set self.attibutes from variables?

consider instead having a single list, self.entries, as an attribute. — Kevin
– Kevin, Commented May 13, 2014 at 16:25
yeah, i can't think of a possible case when it's ever a good idea to have that many numbered variables. — acushner
– acushner, Commented May 13, 2014 at 16:28

vaultah · Accepted Answer · 2014-05-13 16:37:22Z

3

Use built-in setattr function to set dynamically named attributes:

for i in range(72):
    setattr(self, 'entry{0}'.format(x), None)

As others have pointed out in comments, there are probably no use-cases for 72 attributes named like that. While this will work, consider using different data type, e.g. dictionary:

self.entries = {}
for i in range(72):
    self.entries[i] = None

edited May 13, 2014 at 16:37

answered May 13, 2014 at 16:25

vaultah

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