I have a list of strings:
list1 = ['array1', 'array2', 'array3']
whose elements I would like to use as names of other lists, like (as conceptual example):
list1[0] = [1, 2, 3]
I know this assignation does not make any sense, but it is only to show what I need.
I have looked for this a lot but didn't find a handy example. If I understood properly, this is not the right way to do it, and better is to use dictionaries. But, I never used dictionaries yet, so I would need some examples.
aDict = { name: 42 for name in list1 }
This gives you:
{'array3': 42, 'array2': 42, 'array1': 42}
If you wanted it ordered:
from collections import OrderedDict
aDict = OrderedDict((name, 42) for name in list1)
aDict = { name: [] for name in list1 }, when I print adict the order of the elements is not the same as in list1, why?
OrderedDict used in this case, if I want to print aDict with the original order?
Use a dictionary:
list1 = {'array1': [0, 1, 2], 'array2': [0, 3], 'array3': [1]}
and then access it like this:
list1['array1'] # output is [0, 1, 2]
To dynamically populate your dictionary:
list1 = {'array1': []}
list1['array1'].append(1)
print array1 ?You can do What you want with exec like this :
list1 = ['array1', 'array2', 'array3']
x=list1[1]
exec("%s = %d" % (x,2))
print array2
so result is :
2
But never use exec when you can use something much safer like dictionary, it can be dangerous !
