I would like to create new variables from a list.
For example:
mylist=[A,B,C]
From which i would like to create the following variables:
self.varA
self.varB
self.varC
How can create these new variables in a loop?
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2 Answers
mylist=['A','B','C']
for name in mylist:
setattr(self, name, None)
but this is nearly always a bad idea and the values should be in a dict like:
self.v = {}
for name in mylist:
self.v[name] = None
1 Comment
sjr
+1, and just because you can do something in Python doesn't mean you should
Your question ignores the fact that the variables need values ... who is going to supply what values how? Here is a solution to one of the possible clarified questions:
With this approach, the caller of your constructor can use either a dict or keyword args to pass in the names and values.
>>> class X(object):
... def __init__(self, **kwargs):
... for k in kwargs:
... setattr(self, k, kwargs[k])
...
# using a dict
>>> kandv = dict([('foo', 'bar'), ('magic', 42), ('nix', None)])
>>> print X(**kandv).__dict__
{'nix': None, 'foo': 'bar', 'magic': 42}
# using keyword args
>>> print X(foo='bar', magic=42, nix=None).__dict__
{'nix': None, 'foo': 'bar', 'magic': 42}
1 Comment
Zvi
I actually managed to get it right with setattr and getattr in the following manner: for c in curlist: setattr(self, "penum"+c, 0) … … valuel=getattr(self,(entlistnum[n]+curlist[c])) setattr(self,(entlistnum[n]+curlist[c]),valuel+1) In any case, thank you for your valuable explanation.