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Groups > comp.lang.python > #19093 > unrolled thread
| Started by | Wilfried Falk <w_h_falk@yahoo.de> |
|---|---|
| First post | 2012-01-18 09:52 +0000 |
| Last post | 2012-01-19 19:19 +0100 |
| Articles | 2 — 2 participants |
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"+=" does not work correct all alogn Wilfried Falk <w_h_falk@yahoo.de> - 2012-01-18 09:52 +0000
Re: "+=" does not work correct all alogn Olive <diolu@bigfoot.com> - 2012-01-19 19:19 +0100
| From | Wilfried Falk <w_h_falk@yahoo.de> |
|---|---|
| Date | 2012-01-18 09:52 +0000 |
| Subject | "+=" does not work correct all alogn |
| Message-ID | <mailman.4841.1326905342.27778.python-list@python.org> |
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Hello Pythons, attached to this email is a pdf-file which shows, that "+=" does not work well all along. Mybe somebody of you is able to explain my observations in this respect. I will be glad about an answer. Best regards Wilfried
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| From | Olive <diolu@bigfoot.com> |
|---|---|
| Date | 2012-01-19 19:19 +0100 |
| Message-ID | <20120119191950.7b908eee@bigfoot.com> |
| In reply to | #19093 |
On Wed, 18 Jan 2012 09:52:55 +0000 (GMT) Wilfried Falk <w_h_falk@yahoo.de> wrote: > Hello Pythons, > > attached to this email is a pdf-file which shows, that "+=" does not > work well all along. Mybe somebody of you is able to explain my > observations in this respect. I will be glad about an answer. Best > regards Wilfried I am not sure I understand your first question. For the second this is explained here: http://docs.python.org/tutorial/controlflow.html#default-argument-values In the first case, you create a new list from the empty list at each call. In the second case, you modify the argument in place and it is not reevaluated between calls. Olive
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