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List changes unexpectedly after assignment. How do I clone or copy it to prevent this?
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With new_list = my_list, you don't actually have two lists. The assignment just copies the reference to the list, not the actual list, so both new_list and my_list refer to the same list after the assignment.
To actually copy the list, you have various ...
Using regular expressions to parse HTML: why not?
...mann pointed out, regular languages are also context-free, so context-free doesn't necessarily mean not regular). The only thing you can do with regexps on HTML is heuristics but that will not work on every condition. It should be possible to present a HTML file that will be matched wrongly by any r...
How do the PHP equality (== double equals) and identity (=== triple equals) comparison operators dif
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does anyone else find it strange that "000" == "0000" ?
– nickf
Sep 17 '08 at 13:08
36
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How do you append to an already existing string?
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In classic sh, you have to do something like:
s=test1
s="${s}test2"
(there are lots of variations on that theme, like s="$s""test2")
In bash, you can use +=:
s=test1
s+=test2
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How do detect Android Tablets in general. Useragent?
...t and there is no difference between tablet Android and mobile Android. I don't want to just target a specific device like the Xoom Useragent since Android will most likely be on multiple tablet devices in the near future.
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Which version of Python do I have installed?
I have to run a Python script on a Windows server. How can I know which version of Python I have, and does it even really matter?
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How to stop line breaking in vim
...ike that the long lines are displayed over more than one terminal line; I don’t like that vim inserts newlines into my actual text. Which part of .vimrc I should change?
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滚动布局管理器拓展 - ScrollArrangementHandler · App Inventor 2 中文网
...件到屏幕上
绑定滚动布局
when Screen1.Initialize
do
// 绑定水平滚动布局
call HorizontalScrollHandler1.RegisterScrollView HorizontalArrangement1
// 绑定垂直滚动布局
call VerticalScrollHandler1.RegisterScrollView VerticalArrangement1
响...
When is it appropriate to use UDP instead of TCP? [closed]
...rantees packet delivery and thus can be considered "reliable", whereas UDP doesn't guarantee anything and packets can be lost. What would be the advantage of transmitting data using UDP in an application rather than over a TCP stream? In what kind of situations would UDP be the better choice, and wh...
Returning the product of a list
Is there a more concise, efficient or simply pythonic way to do the following?
14 Answers
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