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How do I retrieve the number of columns in a Pandas data frame?
...main logic instead to solve things. You may sacrifice processing speed sometimes, but I value my coding time and code readability more than a few seconds of processing time. In this particular case: if you learn that the number of rows can be calculated with len(df.index), next time you need the num...
What type of hash does WordPress use?
...f this will help at all, but WP will still take the straight MD5 the first time you used the Password, then it will "salt" it. SO, if you have access to the DB, using MyPHPAdmin you can change the PW to "MyPass", select MD5 in the "Function" dropdown and it will save as a straight MD5. Sign into Wor...
Remove unused imports in Android Studio
...ou don't need to call (Ctrl+Shift+O) or "Project/Optimize Imports..." each time.
Just set this checkbox in Settings -> Editor -> General -> Auto Import -> Optimize Imports on the fly.
On OSX: Preferences -> Editor -> General -> Auto Import -> Optimize imports on the fly
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Get started with Latex on Linux [closed]
... latex you'll find that you need to run it over multiple files or multiple times (the first time updates the references, and the second puts references into the document, so they can be out-of-date unless you run latex twice...). Abstracting this into a makefile can save a lot of time and effort.
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Nested classes' scope?
...t the name Outer is bound to, then this code will use that object the next time it is executed.)
If you instead want all Inner objects to have a reference to an Outer because outer_var is really an instance attribute:
class Outer(object):
def __init__(self):
self.outer_var = 1
def...
Specify custom Date format for colClasses argument in read.table/read.csv
...ySchizoBuddy, If you only have one date column and you are doing this one time then it probably does not matter which way you do it. But if you have several columns in your dataset that are dates, then I think this approach would probably be simpler than changing each of the columns after reading....
ThreadStatic v.s. ThreadLocal: is generic better than attribute?
...initialization function (as Reed's blog shows) that's run before the first time the item is accessed.
In my opinion, there is no advantage to using [ThreadStatic] instead of ThreadLocal<T>.
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Understanding NSRunLoop
...sm to handle system input sources (sockets, ports, files, keyboard, mouse, timers, etc).
Each NSThread has its own run loop, which can be accessed via the currentRunLoop method.
In general, you do not need to access the run loop directly, though there are some (networking) components that may allo...
Why does this async action hang?
...mistake with the TPL, so don't feel bad.
When you write await foo, the runtime, by default, schedules the continuation of the function on the same SynchronizationContext that the method started on. In English, let's say you called your ExecuteAsync from the UI thread. Your query runs on the threadp...
.NET Format a string with fixed spaces
Does the .NET String.Format method allow placement of a string at a fixed position within a fixed length string.
10 Answers...