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Pandas - How to flatten a hierarchical index in columns
...test version of pandas. It works with 0.18 but not with 0.20 (latest as of now)
– TH22
Oct 10 '17 at 20:59
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What is the native keyword in Java for?
...212:
protected native Object clone() throws CloneNotSupportedException;
Now comes the hard part, finding where clone is amidst all the indirection. The query that helped me was:
find . -iname object.c
which would find either C or C++ files that might implement Object's native methods. It leads...
Is there a method that calculates a factorial in Java?
I didn't find it, yet. Did I miss something?
I know a factorial method is a common example program for beginners. But wouldn't it be useful to have a standard implementation for this one to reuse?
I could use such a method with standard types (Eg. int, long...) and with BigInteger / BigDecimal, too...
How to set working/current directory in Vim?
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@falstro, do you know how :cd command can apply to all windows within the same vim running instances? Ex: when using split :sp
– mgouin
Jan 19 '17 at 21:29
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How do you add Boost libraries in CMakeLists.txt?
... can also use FIND_PACKAGE(Boost REQUIRED COMPONENTS system) if you don't know the exact version of boost to use
– smac89
Aug 17 '17 at 6:39
add a comment
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PostgreSQL - Rename database
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AND datname = 'name of database';
-- rename the database (it should now have zero clients)
ALTER DATABASE "name of database" RENAME TO "new name of database";
Note that table pg_stat_activity column pid was named as procpid in versions prior to 9.2. So if your PostgreSQL version is lower th...
Why doesn't django's model.save() call full_clean()?
I'm just curious if anyone knows if there's good reason why django's orm doesn't call 'full_clean' on a model unless it is being saved as part of a model form.
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Explain the “setUp” and “tearDown” Python methods used in test cases
... initializing db, preparing rules and so on) into the setUp.
Also as you know each test should stop in the place where it was started - this means that we have to restore app state to it's initial state - e.g close files, connections, removing newly created items, calling transactions callback and ...
Convert System.Drawing.Color to RGB and Hex Value
...g it may have some problem and need your kind advice. In addition, I dont know whether there is any existing method to do the same.
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Expansion of variables inside single quotes in a command in Bash
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@Evert: Don't know how to say it better. I've removed the sentence.
– Jo So
Mar 9 '17 at 15:13
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