Could someone please explain to me how to create class instances from a list (or a string that might be fetched from excel). I always seem to run into this problem. I want to create many instances of classes and then save them in a shelve later.
This sample code doesn't work, but illustrates the approach I'm trying.
class test:
def __init__(self):
self.a='name'
if _name__=='__main__':
list=['A','B']
for item in list:
item=test()
Few issues in your code includes naming of variables. It can confuse you.
class test:
# I guess you want to provide the name to initialize the object attribute
def __init__(self, name):
# self.name is the attribute where the name is stored.
# I prefer it to self.A
self.name = name
Now the issue here is that instance is also a element of your list, which I presume is a name.
if __name__=='__main__':
# I presume these are list of names
list_of_names = ['A','b','c']
# You have to store your instance some where.
instance_list = []
# Here name is an element of the list that you are iterating
# I change it to name instead of instance
for name in list_of_names:
# Here I am appending to the list, a test object that I create
instance_list.append(test(name))
[Edit:]
Now, I truly don't understand you, why this piece of code:
for item in list:
item=class() # How can you reassign the item ?
See what this item is .
>>> for item in ['A', 'B']:
... print item
...
A
B
>>>
You should not assign it item = .... but you should use it .... = ..(item) !!!
classused as a function? What tutorial are you following to learn Python?User. An instance could beuseroractive_userorbanned_useretc. There's no good reason for the an instance to be namedfred.