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how to reference a YAML “setting” from elsewhere in the same YAML file?
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Yes, using custom tags. Example in Python, making the !join tag join strings in an array:
import yaml
## define custom tag handler
def join(loader, node):
seq = loader.construct_sequence(node)
return ''.join([str(i) for i in seq])
## register the ta...
“message failed to fetch from registry” while trying to install any module
...xtra steps. Example install:
sudo apt-get update
sudo apt-get install -y python-software-properties python g++ make
sudo add-apt-repository ppa:chris-lea/node.js
sudo apt-get update
sudo apt-get install nodejs
After that, npm was already included and worked perfectly.
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Multiple commands in gdb separated by some sort of delimiter ';'?
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You can do this using the python integration in gdb.
It would be nice if s ; bt stepped and then printed a backtrace, but it doesn't.
You can accomplish the same thing by calling into the Python interpreter.
python import gdb ; print(gdb.execute("s...
How to clear the interpreter console?
Like most Python developers, I typically keep a console window open with the Python interpreter running to test commands, dir() stuff, help() stuff , etc.
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Can't install PIL after Mac OS X 10.9
...'ve just updated my Mac OS to 10.9 and I discovered that some (all?) of my Python modules are not here anymore, especially the Image one.
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Force line-buffering of stdout when piping to tee
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For python script stdbuf will not work, but you can use -u to disable buffering on python's side: python3 -u a.py | tee output.txt
– Honza
Jan 2 at 13:56
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best way to preserve numpy arrays on disk
...storing large numpy arrays. There are two options for dealing with hdf5 in python:
http://www.pytables.org/
http://www.h5py.org/
Both are designed to work with numpy arrays efficiently.
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Pip freeze vs. pip list
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Python 3.2 includes wsgiref.egg-info in the Lib directory, which is why pip knows about it. You can't [un]install it with pip, and later versions of Python omit the metadata file so it won't appear.
– Zo...
Django South - table already exists
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Perform these steps in order may help you:
1) python manage.py schemamigration apps.appname --initial
Above step creates migration folder as default.
2) python manage.py migrate apps.appname --fake
generates a fake migration.
3) python manage.py schemamigration apps....
Why is “except: pass” a bad programming practice?
... the exception bubble up.
Another simple example is also mentioned in the Python 2 idioms document. Here, a simple typo exists in the code which causes it to break. Because we are catching every exception, we also catch NameErrors and SyntaxErrors. Both are mistakes that happen to us all while prog...