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How to compare variables to undefined, if I don’t know whether they exist? [duplicate]
...ed , you can check variable == undefined ; I know that, but how can you compare a value that you don’t know yet if it’s in memory?
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Why does cURL return error “(23) Failed writing body”?
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This happens when a piped program (e.g. grep) closes the read pipe before the previous program is finished writing the whole page.
In curl "url" | grep -qs foo, as soon as grep has what it wants it will close the read stream from curl. cURL doesn't expect ...
Removing pip's cache?
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edited Dec 21 '17 at 17:06
Brian Burns
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Keep only date part when using pandas.to_datetime
I use pandas.to_datetime to parse the dates in my data. Pandas by default represents the dates with datetime64[ns] even though the dates are all daily only.
I wonder whether there is an elegant/clever way to convert the dates to datetime.date or datetime64[D] so that, when I write the data t...
How do I delete a local repository in git? [duplicate]
I can't find the command. I tried Googling "git 'delete a repository'".
4 Answers
4
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How to sort an ArrayList?
...(testList);
Collections.reverse(testList);
That will do what you want. Remember to import Collections though!
Here is the documentation for Collections.
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How do I update a Python package?
I'm running Ubuntu 9:10 and a package called M2Crypto is installed (version is 0.19.1). I need to download, build and install the latest version of the M2Crypto package (0.20.2).
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Error to run Android Studio
...| grep -i jdk
If not, install JDK
sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update && sudo apt-get install oracle-java8-installer
After the installation you have to enable the jdk
update-alternatives --display java
Check if Ubuntu uses Java JDK 8
java -version
If a...
Open a file with su/sudo inside Emacs
Suppose I want to open a file in an existing Emacs session using su or sudo , without dropping down to a shell and doing sudoedit or sudo emacs . One way to do this is
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Java; String replace (using regular expressions)?
As part of a project for school, I need to replace a string from the form:
12 Answers
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