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How to estimate how much memory a Pandas' DataFrame will need?
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df.memory_usage() will return how many bytes each column occupies:
>>> df.memory_usage()
Row_ID 20906600
Household_ID 20906600
Vehicle 20906600
Calendar_Year 20906600
Model_Year 20906600
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To include indexes, pass ...
How do I parse an ISO 8601-formatted date?
...t tries to guess the format and makes inevitable assumptions (customizable by hand only) in ambiguous cases. So ONLY use it if you need to parse input of unknown format and are okay to tolerate occasional misreads.
– ivan_pozdeev
Apr 23 '15 at 23:34
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What is the Git equivalent for revision number?
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@Lii: What do you mean by "source commit"? Both the nearest tag (v1.0.4) and the most recent commit id (2414721) are already part of the git describe output.
– Greg Hewgill
Oct 15 '18 at 19:34
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How to rename a single column in a data.frame?
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I like this solution as you can reference the column name by name, as opposed to requiring to know which number column it is. Better for larger number features.
– Cybernetic
Aug 22 '14 at 17:18
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Find a commit on GitHub given the commit hash
...ile.ext - e.g. github.com/mongodb/mongo/blob/…
– RubyTuesdayDONO
Mar 5 '13 at 16:56
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Choose Git merge strategy for specific files (“ours”, “mine”, “theirs”)
...The index may contain unmerged entries because of a previous failed merge. By default, if you try to check out such an entry from the index, the checkout operation will fail and nothing will be checked out. Using -f will ignore these unmerged entries. The contents from a specific side of the merge c...
CATALINA_OPTS vs JAVA_OPTS - What is the difference?
...use CATALINA_OPTS. So if you're setting environment variables for use only by Tomcat, you'll be best advised to use CATALINA_OPTS, whereas if you're setting environment variables to be used by other java applications as well, such as by JBoss, you should put your settings in JAVA_OPTS.
Source: CATA...
How do I obtain a Query Execution Plan in SQL Server?
...ght find it helpful to be able to obtain a plan via SQL Server Profiler or by inspecting the plan cache.
Method 1 - Using SQL Server Management Studio
SQL Server comes with a couple of neat features that make it very easy to capture an execution plan, simply make sure that the "Include Actual Exec...
How SignalR works internally?
...ame
Long polling
SignalR tries to choose the "best" connection supported by server and client (you can also force it to use a specific transport).
That's the high level. If you want to see how each transport is implemented, you can look at the source code.
There's also client code for each tran...
How to detect Windows 64-bit platform with .NET?
... first check if running in a 64-bit process (I think in .NET you can do so by checking IntPtr.Size), and if you are running in a 32-bit process, you still have to call the Win API function IsWow64Process. If this returns true, you are running in a 32-bit process on 64-bit Windows.
Microsoft's Raymon...