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In pure functional languages, is there an algorithm to get the inverse function?
...n this result, as well as the number of times it can have called f. Define now a family of functions
g j (B1 : B0 : ... (n+j times) ... B0 : ls)
= B0 : ... (n+j times) ... B0 : B1 : ls
g j (B0 : ... (n+j times) ... B0 : B1 : ls)
= B1 : B0 : ... (n+j times) ... B0 : ls
g j l = l
Clearly, for...
Differences between Emacs and Vim
...ftp client, tetris, ... whatnot in one package (emacs) made some sense ... nowadays, it doesn't anymore.
Both are however a topic of religious discussions among the programmer and superuser community users, and in that respect, both are excellent for starting flame wars if put in contact (in the sa...
Compare two DataFrames and output their differences side-by-side
...
df_final = df_all.swaplevel(axis='columns')[df.columns[1:]]
df_final
Now, its much easier to spot the differences in the frames. But, we can go further and use the style property to highlight the cells that are different. We define a custom function to do this which you can see in this part of...
Options, Settings, Properties, Configuration, Preferences — when and why?
...s style was ‘Options’ on the ‘Tools’ menu, though all bets are off now as more MS apps drop the menu bar and throw the old predictable controls all over the place with no consistent pettern.
RISC OS style was ‘Choices’ on the icon bar menu, just to add yet another pointless possibility....
Postgres: “ERROR: cached plan must not change result type”
...eing thrown by the PostgreSQL 8.3.7 server to my application.
Does anyone know what this error means and what I can do about it?
...
Difference between 'struct' and 'typedef struct' in C++?
..., so you can add a typedef:
struct Foo { ... };
typedef struct Foo Foo;
Now struct Foo (in the tag namespace) and just plain Foo (in the ordinary identifier namespace) both refer to the same thing, and you can freely declare objects of type Foo without the struct keyword.
The construct:
typed...
PHP: exceptions vs errors?
... of Error VS the descendants of Exception.
– XedinUnknown
Oct 1 '18 at 14:58
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show 1 more comment
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What is the standard Python docstring format? [closed]
...ion of what is returned
@raise keyError: raises an exception
"""
- reST
Nowadays, the probably more prevalent format is the reStructuredText (reST) format that is used by Sphinx to generate documentation.
Note: it is used by default in JetBrains PyCharm (type triple quotes after defining a method...
Rails where condition using NOT NIL
...aving, this is just a tiny facet. But of course a general case is good to know.
– Adam Lassek
Jul 26 '11 at 22:26
1
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How can I install from a git subdirectory with pip?
... while until it gets merged to master and is distributed.
UPDATE: This is now available and documented at https://pip.readthedocs.io/en/stable/reference/pip_install/#vcs-support as follows:
For projects where setup.py is not in the root of project,
"subdirectory" component is used. Value of "...