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How to install a specific version of a ruby gem?
Using the command-line gem tool, how can I install a specific version of a gem?
6 Answers
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Upgrade python in a virtualenv
...you will need to see your virtualenv version).
If your virtualenv is installed with the same python version of the old one and upgrading your virtualenv package is not an option, you may want to read this in order to install a virtualenv with the python version you want.
EDIT
I've tested this ap...
Assert a function/method was not called using Mock
...y to test my application, but I want to assert that some function was not called. Mock docs talk about methods like mock.assert_called_with and mock.assert_called_once_with , but I didn't find anything like mock.assert_not_called or something related to verify mock was NOT called .
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Get ffmpeg information in friendly way
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edited Nov 19 '11 at 1:55
answered Nov 19 '11 at 1:47
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Send string to stdin
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@Pyrolistical yes! Especially useful when mastering for example a perl oneliner from a command line - easy editing of perl's arguments without the need much backward movements with a cursor. :)
– jm666
Feb 12 '1...
Detect if stdin is a terminal or pipe?
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Summary
For many use cases the POSIX function isatty() is all what it is needed to detect if stdin is connected to a terminal. A minimal example:
#include <unistd.h>
#include <stdio.h>
int main(int argc, char **argv)
{
if (isatty(fileno(stdin)))
puts("stdin is co...
How to loop over files in directory and change path and add suffix to filename
...le of notes first: when you use Data/data1.txt as an argument, should it really be /Data/data1.txt (with a leading slash)? Also, should the outer loop scan only for .txt files, or all files in /Data? Here's an answer, assuming /Data/data1.txt and .txt files only:
#!/bin/bash
for filename in /Data/*...
How to list the files inside a JAR file?
I have this code which reads all the files from a directory.
16 Answers
16
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Compare two DataFrames and output their differences side-by-side
...original question
The first step is to concatenate the DataFrames horizontally with the concat function and distinguish each frame with the keys parameter:
df_all = pd.concat([df.set_index('id'), df2.set_index('id')],
axis='columns', keys=['First', 'Second'])
df_all
It's pr...
MISCONF Redis is configured to save RDB snapshots
...rvices.msc, Enter -> Search for Redis then click on restart.
I personally had this issue after upgrading redis with Brew (brew upgrade).
After rebooting the laptop, it immediately worked.
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