大约有 31,840 项符合查询结果（耗时：0.0323秒） [XML]
Determine if map contains a value for a key?
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Alan I have to agree with @dynamic on this one, having to define an iterator and then compare it with end is not a natural way of saying that something does not exist. It seems far more straightforward to me to say that a certain element appears at least once in this ...
How many database indexes is too many?
...ery slow with lots of indexes since they all need to be modified each time one of these operations takes place
Having said that, you can clearly add a lot of pointless indexes to a table that won't do anything. Adding B-Tree indexes to a column with 2 distinct values will be pointless since it doe...
Difference in Months between two dates in JavaScript
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Nothing complicated with this one except the fact that every month started is counted. 31/03/2011 -> 01/05/2011 will be two months as well as 01/03/2011 -> 31/05/2011 but it should be three to be exact.
– Natim
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Adding a new entry to the PATH variable in ZSH
...shrc already had a line for export PATH so I replaced it with the modified one.
– Zack Huston
Feb 27 '14 at 13:32
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Grep characters before and after match?
...bin/Link to iconic S -rwxrwxrwx 777 rick 1000 ri
The file in question is one continuous 25K line and it is hopeless to find what you are looking for using regular grep.
Notice the two different ways you can call cgrep that parallels grep method.
There is a "niftier" way of creating the function wh...
Bash: If/Else statement in one line
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pgrep -q some_process && echo 1 || echo 0
more oneliners here
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Save icon: Still a floppy disk? [closed]
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There haven't been any steam locomotives for 50 years or so, but everyone still knows that this is the symbol for trains. And in the same way, 50 years from now, when your files are stored on Google servers in orbit, everyone will know that the floppy is the symbol for saving your data.
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Undo a Git merge that hasn't been pushed yet
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With git reflog check which commit is one prior the merge (git reflog will be a better option than git log). Then you can reset it using:
git reset --hard commit_sha
There's also another way:
git reset --hard HEAD~1
It will get you back 1 commit.
Be aware ...
Indenting code in Sublime text 2?
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Having done nothing, it suddenly started working. :) I guess the problem was between the keyboard and the chair all along :) Thank you anyway. :)
– Nuno Gonçalves
Dec 13 '12 at 14:27
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Convert Python dict into a dataframe
... value 2 value 3
It's saved me some headaches so I hope it helps someone out there!
EDIT: In the pandas docs one option for the data parameter in the DataFrame constructor is a list of dictionaries. Here we're passing a list with one dictionary in it.
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