in java, the following code defines an array of the predefined class (myCls):
myCls arr[] = new myCls
how can I do that in python? I want to have an array of type (myCls)?
thanks in advance
views:
109answers:
2
+5
A:
Python is dynamically typed. You do not need to (and in fact CAN'T) create a list that only contains a single type:
arr = list()
arr = []
If you require it to only contain a single type then you'll have to create your own list-alike, reimplementing the list methods and __setitem__() yourself.
Ignacio Vazquez-Abrams
2009-12-27 10:54:56
but you CAN create arrays of only integers, double, etc. types in python
catchmeifyoutry
2009-12-27 11:00:41
I don't think that the OP cares about the difference between arrays and lists.
Georg
2009-12-27 11:05:02
The statement that you cannot is false, however.
bayer
2009-12-27 11:47:17
No, it isn't. list does not care what class it contains. Yes, you can create a list-alike that only accepts a single type, or use array.array, but neither of those is a list.
Ignacio Vazquez-Abrams
2009-12-27 11:50:54
@Ignacio: indeed your "CAN'T" statement as specified is false. In python, you CAN create a list that contains items of a single type; what you can't, is you CAN'T ENFORCE the list items to be of a single type.
ΤΖΩΤΖΙΟΥ
2009-12-27 13:36:12
+3
A:
You can only create arrays of only a single type using the array package, but it is not designed to store user-defined classes.
The python way would be to just create a list of objects:
a = [myCls() for _ in xrange(10)]
You might want to take a look at this stackoverflow question.
NOTE:
Be careful with this notation, IT PROBABLY DOES NOT WHAT YOU INTEND:
a = [myCls()] * 10
This will also create a list with ten times a myCls object, but it is ten times THE SAME OBJECT, not ten independently created objects.
catchmeifyoutry
2009-12-27 10:59:13