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Python List vs. Array - when to use?
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+1 for concrete example and mentioning speed benefit. The top answer made me wonder, "Is there a time-memory tradeoff?" and "Is there any use for this that's not a very esoteric low-memory case?"
– leewz
Feb 5 '14 at 20:48
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Why does dividing two int not yield the right value when assigned to double?
...owever almost all languages (certainly all the ones I can think of off the top of my head) treat this example identically.
Xcode 4.2 debug doesn't symbolicate stack call
...he debugger. You can set a break point whenever a exception is thrown and stop the execution right there, just as it used to happen on 4.0.
On the "Breakpoint Navigator", add a "Exception Breakpoint" and just press "Done" on the options popup.
That's all!
PS: In some cases would be better to brea...
How to clone git repository with specific revision/changeset?
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This solution should be on top. Nobody cares that it's "not optimal", it's what the OP asked for. Specifically: "how do I clone git repository with specific revision"?
– Florian Segginger
Mar 18 '16 at 8:53
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C++ convert vector to vector
... showLowRepImageUploadWarning: true,
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MySQL Error 1215: Cannot add foreign key constraint
...ssuing command
SHOW ENGINE INNODB STATUS;
you may find a error near the top of the printed message something like
Cannot find an index in the referenced table where the
referenced columns appear as the first columns, or column types
in the table and the referenced table do not match for c...
Replacement for deprecated sizeWithFont: in iOS 7?
...boundingRectWithSize:... method for NSAttributedString. This was built on top of the NSStringDrawing libraries and is thread safe.
If you look at the new NSString boundingRectWithSize:... function, it asks for an attributes array in the same manner as a NSAttributeString. If I had to guess, thi...
Repeat table headers in print mode
...I do a print preview. Thank you. But, I see to get a replicated row at the top of the next page. Why?
– Andrew Truckle
Mar 29 '17 at 17:23
add a comment
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Updating MySQL primary key
...dd primary key (user_2, user_1, type );
unlock tables;
The lock should stop further updates coming in while your are doing this. How long this takes obviously depends on the size of your table.
The main problem is if you have some duplicates with the same timestamp.
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How to get CRON to call in the correct PATHs
...our own environment variables to the local crontab by defining them at the top of your crontab.
Here's a quick fix to prepend $PATH to the current crontab:
# echo PATH=$PATH > tmp.cron
# echo >> tmp.cron
# crontab -l >> tmp.cron
# crontab tmp.cron
The resulting crontab will look s...