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Can we write our own iterator in Java?
...rray of Strings
String[] languages = new String[]{"C", "C++", "Java", "Python", "Scala"};
// create your list and hold the values using the same list implementation.
SOList<String> languagesList = new SOList<String>(languages);
System.out.println("");
// Since our c...
How to restart Jenkins manually?
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The below commands worked for me in Red Hat Linux and should work for Ubuntu also.
To know the status of Jenkins:
sudo service jenkins status
To start the Jenkins:
sudo service jenkins start
To stop the Jenkins:
sudo service jenkins stop
To restart the Jenkins:...
get list from pandas dataframe column
...u pull them out, which you can then call x.tolist() on to turn them into a Python list. Alternatively you cast it with list(x).
import pandas as pd
data_dict = {'one': pd.Series([1, 2, 3], index=['a', 'b', 'c']),
'two': pd.Series([1, 2, 3, 4], index=['a', 'b', 'c', 'd'])}
df = pd.Data...
Get the (last part of) current directory name in C#
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@SimonBrangwin I thought everything is a file in Linux :)
– Razor
Apr 28 '18 at 3:03
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add a string prefix to each value in a string column using Pandas
...lso yields the desired output:
col
0 stra
1 str0
If you are using Python 3.6+, you can also use f-strings:
df['col'] = df['col'].apply(lambda x: f"str{x}")
yielding the same output.
The f-string version is almost as fast as @RomanPekar's solution (python 3.6.4):
df = pd.DataFrame({'col...
Why is volatile not considered useful in multithreaded C or C++ programming?
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You might also consider this from the Linux Kernel Documentation.
C programmers have often taken volatile to mean that the variable
could be changed outside of the current thread of execution; as a
result, they are sometimes tempted to use it in kernel co...
Regex Last occurrence?
...This worked great for me. ([^\/]*)$ matches the file name in a path for a Linux box. Can you explain how the caret ^ works in this context? I have only ever used it for signifying the beginning of strings.
– Brad
Jun 23 '14 at 1:21
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What's the recommended approach to resetting migration history using Django South?
... are taking too long, this worked for me.
rm <app-dir>/migrations/*
python manage.py schemamigration <app-name> --initial
python manage.py migrate <app-name> 0001 --fake --delete-ghost-migrations
Don't forget to manually restore any dependencies on other apps by adding lines li...
How can I import a database with MySQL from terminal?
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Assuming you're on a Linux or Windows console:
Prompt for password:
mysql -u <username> -p <databasename> < <filename.sql>
Enter password directly (not secure):
mysql -u <username> -p<PlainPassword> <datab...
get just the integer from wc in bash
...s do not work on OSX.
Any of the following should be portable on bsd and linux.
wc -l < "$f" | tr -d ' '
OR
wc -l "$f" | tr -s ' ' | cut -d ' ' -f 2
OR
wc -l "$f" | awk '{print $1}'
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