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Test whether a glob has any matches in bash
...e are specified by POSIX), and it's faster than ls -d glob* (the previous accepted answer) becasue it stops when it reaches the first match.
– Ken Bloom
Nov 24 '10 at 14:54
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setting an environment variable in virtualenv
...s in $VIRTUAL_ENV/bin/. You need the postactivate hook.
$ workon myvenv
$ cat $VIRTUAL_ENV/bin/postactivate
#!/bin/bash
# This hook is run after this virtualenv is activated.
export DJANGO_DEBUG=True
export S3_KEY=mykey
export S3_SECRET=mysecret
$ echo $DJANGO_DEBUG
True
If you want to keep this ...
How to get a list of repositories apt-get is checking? [closed]
...
Try this:
cat /etc/apt/sources.list
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How to create a self-signed certificate with OpenSSL
...DNS.2 = www.example.com
DNS.3 = mail.example.com
DNS.4 = ftp.example.com
# Add these if you need them. But usually you don't want them or
# need them in production. You may need them for development.
# DNS.5 = localhost
# DNS.6 = localhost.localdomain
# IP.1 =...
Change one value based on another value in pandas
... numpy as np
df = pd.DataFrame([['dog', 'hound', 5],
['cat', 'ragdoll', 1]],
columns=['animal', 'type', 'age'])
In[1]:
Out[1]:
animal type age
----------------------
0 dog hound 5
1 cat ragdoll 1
Below we are adding a new description co...
Why is enum class preferred over plain enum?
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enum class Color { red, green, blue }; // enum class
enum Animal { dog, cat, bird, human }; // plain enum
What is the difference between the two?
enum classes - enumerator names are local to the enum and their values do not implicitly convert to other types (like another enum or int)
Plain en...
how to check the dtype of a column in python pandas
...has existed since Pandas 0.13, and it does the same thing, but it was deprecated in favour of pandas.api.types.is_numeric_dtype in 0.19, I think
– Migwell
May 8 '19 at 0:50
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INotifyPropertyChanged vs. DependencyProperty in ViewModel
...hCode() methods
A DependencyObject has thread affinity – it can only be accessed
on the thread on which it was
created
I prefer the POCO approach. A base class for PresentationModel (aka ViewModel) which implements INotifyPropertyChanged interface can be found here: http://compositeextensions.co...
Longest line in a file
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Why the extra cat command? Just give the file name directly as an argument to awk.
– Thomas Padron-McCarthy
Oct 31 '09 at 21:40
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Maximum number of threads per process in Linux?
...esses with a shared address space on Linux) which you can view like this:
cat /proc/sys/kernel/threads-max
The default is the number of memory pages/4. You can increase this like:
echo 100000 > /proc/sys/kernel/threads-max
There is also a limit on the number of processes (and hence threads...