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Append column to pandas dataframe
...efore you join() or concat() if you trying to deal with some data frame by selecting some rows from another DataFrame.
One example below shows some interesting behavior of join and concat:
dat1 = pd.DataFrame({'dat1': range(4)})
dat2 = pd.DataFrame({'dat2': range(4,8)})
dat1.index = [1,3,5,7]
dat...
What is the difference between mutex and critical section?
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The 'fast' Windows equal of critical selection in Linux would be a futex, which stands for fast user space mutex. The difference between a futex and a mutex is that with a futex, the kernel only becomes involved when arbitration is required, so you save the over...
How do I set the maximum line length in PyCharm?
...ode style->python : ensure right margin is not exceeded. Once this was selected the reformat would work.
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What is sharding and why is it important?
... a DBMS for which the locality is quite restricted (say, a user only fires selects with a 'where username = $my_username') it makes sense to put all the usernames starting with A-M on one server and all from N-Z on the other. By this you get near linear scaling for some queries.
Long story short: S...
How can I check if the current date/time is past a set date/time?
... answered May 14 '10 at 7:26
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How do you use https / SSL on localhost?
...n your top level site --> Bindings
Add or edit a binding for https and select the SSL certificate called "localhost".
4.) Import Certificate to Chrome:
Chrome Settings --> Manage Certificates --> Import .pfx certificate from C:\certificates\ folder
Test Certificate by opening Chrome an...
How to perform a mysqldump without a password prompt?
...and in no case the root user. It can be done like this: GRANT LOCK TABLES, SELECT ON *.* TO 'BACKUPUSER'@'%' IDENTIFIED BY 'PASSWORD';
– gadjou
Feb 21 '17 at 8:34
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How do you get current active/default Environment profile programmatically in Spring?
...ar functionality using the annotation @Profile("local") Profiles allow for selective configuration based on a passed-in or environment parameter. Here is more information on this technique: Spring Profiles
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What is the best workaround for the WCF client `using` block issue?
...e of the channel factory and channel. ExceptionHandlingProxy respects your selections in the Add Service Reference dialog with respect to asynchronous methods and collection types.
Codeplex has a project called Exception Handling WCF Proxy Generator. It basically installs a new custom tool to Visu...
How to add multi line comments in makefiles
...ng your makefiles in VIM:
Either decide which lines you want to comment or select them with 'v'.
Then you can use the regex s/^/#/ to comment out the lines
and s/^#// to revert them.
--Notes--
To open the vim command line, press : (colon)
To prep the command for the next 'n' lines, use .,+n
A ...