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Created on 2009-06-06 07:04 by pushkarparanjpe, last changed 2022-04-11 14:56 by admin. This issue is now closed.
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| msg88989 - (view) | Author: Pushkar Paranjpe (pushkarparanjpe) | Date: 2009-06-06 07:04 | |
Is this a bug ? >>> a = [[1,2],[3,4],[5,6]] >>> a [[1, 2], [3, 4], [5, 6]] >>> b = a[0] >>> b [1, 2] >>> b[0] = -8888 >>> b [-8888, 2] >>> a [[-8888, 2], [3, 4], [5, 6]] >>> Created a new variable (b) which refers to an element in a list (a). Changing the value of the new variable also reflects in the original list. I thought the new variable is actually a new variable with its own memory allocation and not a symbolic link to pre-existing data. is this a bug? Please help. |
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| msg88991 - (view) | Author: Raymond Hettinger (rhettinger) *  |
Date: 2009-06-06 07:21 | |
This is correct behavior. Try making a new *copy* of the sublist: a = [[1,2],[3,4],[5,6]] b = a[0][:] b[0] = -8888 |
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| History | |||
|---|---|---|---|
| Date | User | Action | Args |
| 2022-04-11 14:56:49 | admin | set | github: 50468 |
| 2009-06-06 07:21:44 | rhettinger | set | status: open -> closed nosy: + rhettinger messages: + msg88991 resolution: not a bug |
| 2009-06-06 07:04:01 | pushkarparanjpe | create | |