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cartesian product in pandas
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If you have a key that is repeated for each row, then you can produce a cartesian product using merge (like you would in SQL).
from pandas import DataFrame, merge
df1 = DataFrame({'key':[1,1], 'col1':[1,2],'col2':[3,4]})
df2 = DataFrame({'key':[1,1], 'col3':[...
What is the difference between JavaConverters and JavaConversions in Scala?
...is done by creating wrappers that implement either the Scala interface and forward the calls to the underlying Java collection, or the Java interface, forwarding the calls to the underlying Scala collection.
JavaConverters uses the pimp-my-library pattern to “add” the asScala method to the Java...
Primary key or Unique index?
... index?
A unique index on a column is an index on that column that also enforces the constraint that you cannot have two equal values in that column in two different rows. Example:
CREATE TABLE table1 (foo int, bar int);
CREATE UNIQUE INDEX ux_table1_foo ON table1(foo); -- Create unique index on...
Getting a structural type with an anonymous class's methods from a macro
...o have this answer wrap up the question—I think I'd been vaguely waiting for the bug to get fixed.
– Travis Brown
Nov 17 '13 at 11:21
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IIS_IUSRS and IUSR permissions in IIS8
I've just moved away from IIS6 on Win2003 to IIS8 on Win2012 for hosting ASP.NET applications.
6 Answers
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Should everything really be a bundle in Symfony 2.x?
...e in a bundle. You could have a structure like this:
src/Vendor/Model — for models,
src/Vendor/Controller — for controllers,
src/Vendor/Service — for services,
src/Vendor/Bundle — for bundles, like src/Vendor/Bundle/AppBundle,
etc.
This way, you would put in the AppBundle only that stuff t...
How do I find all files containing specific text on Linux?
I'm trying to find a way to scan my entire Linux system for all files containing a specific string of text. Just to clarify, I'm looking for text within the file, not in the file name.
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find filenames NOT ending in specific extensions on Unix?
...(dll|exe)$' would prevent matching againsta a file or dir named "dexe" for example
– drAlberT
Aug 27 '09 at 14:36
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Difference between author and committer in Git?
...ly patches, opaquely, "under the hood"). Are those really the only 2 ways for something like this to happen?
– cowlinator
Feb 14 '19 at 23:19
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OpenSuSE 安装bpftrace - 操作系统(内核) - 清泛网 - 专注IT技能提升
...PTIONS:
-B MODE output buffering mode ('full', 'none')
-f FORMAT output format ('text', 'json')
-o file redirect bpftrace output to file
-d debug info dry run
-dd verbose debug info dry run
-b force BTF (BPF type for...