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What is the reason for performing a double fork when creating a daemon?
... that the child is no
longer a session leader, preventing the daemon from ever acquiring
a controlling terminal.
So it is to ensure that the daemon is re-parented onto init (just in case the process kicking off the daemon is long lived), and removes any chance of the daemon reacquiring...
Removing trailing newline character from fgets() input
I am trying to get some data from the user and send it to another function in gcc. The code is something like this.
13 Answ...
How to use filter, map, and reduce in Python 3
...s in What's New In Python 3.0. You should read it thoroughly when you move from 2.x to 3.x since a lot has been changed.
The whole answer here are quotes from the documentation.
Views And Iterators Instead Of Lists
Some well-known APIs no longer return lists:
[...]
map() and filter() return iterat...
How to implement __iter__(self) for a container object (Python)
...and then every item in some_list.
def __iter__(self):
yield 5
yield from some_list
Pre-3.3, yield from didn't exist, so you would have to do:
def __iter__(self):
yield 5
for x in some_list:
yield x
sha...
How do I remove duplicate items from an array in Perl?
...tputs:
one two three
If you want to use a module, try the uniq function from List::MoreUtils
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Creating a range of dates in Python
...pport for date ranges.
For example pd.date_range():
import pandas as pd
from datetime import datetime
datelist = pd.date_range(datetime.today(), periods=100).tolist()
It also has lots of options to make life easier. For example if you only wanted weekdays, you would just swap in bdate_range.
...
Read a file line by line assigning the value to a variable
...an argument line by line:
while IFS= read -r line; do
echo "Text read from file: $line"
done < my_filename.txt
This is the standard form for reading lines from a file in a loop. Explanation:
IFS= (or IFS='') prevents leading/trailing whitespace from being trimmed.
-r prevents backslash e...
Retrieve specific commit from a remote Git repository
Is there any way to retrieve only one specific commit from a remote Git repo without cloning it on my PC? The structure of remote repo is absolutely same as that of mine and hence there won't be any conflicts but I have no idea how to do this and I don't want to clone that huge repository.
...
Django: accessing session variables from within a template?
...m views make sure you are passing a RequestContext instance. Example taken from documentation:
from django.shortcuts import render_to_response
from django.template import RequestContext
def some_view(request):
# ...
return render_to_response('my_template.html',
...
Extracting extension from filename in Python
Is there a function to extract the extension from a filename?
24 Answers
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