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Command line to remove an environment variable from the OS level configuration
...
To remove the variable from the current environment (not permanently):
set FOOBAR=
To permanently remove the variable from the user environment (which is the default place setx puts it):
REG delete HKCU\Environment /F /V FOOBAR
If the variabl...
Accessing items in an collections.OrderedDict by index
...tainers project has a SortedDict type for just this purpose.
>>> from sortedcontainers import SortedDict
>>> sd = SortedDict()
>>> sd['foo'] = 'python'
>>> sd['bar'] = 'spam'
>>> print sd.iloc[0] # Note that 'bar' comes before 'foo' in sort order.
'bar'
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Branch from a previous commit using Git
If I have n commits, how can I branch from the n-3 commit?
19 Answers
19
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How to port data-only volumes from one host to another?
...estore, or migrate data volumes":
BACKUP:
sudo docker run --rm --volumes-from DATA -v $(pwd):/backup busybox tar cvf /backup/backup.tar /data
--rm: remove the container when it exits
--volumes-from DATA: attach to the volumes shared by the DATA container
-v $(pwd):/backup: bind mount the curren...
Python timedelta in years
... number of years have been since some date. Currently I've got timedelta from datetime module and I don't know how to convert it to years.
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What is the difference between tree depth and height?
This is a simple question from algorithms theory.
The difference between them is that in one case you count number of nodes and in other number of edges on the shortest path between root and concrete node.
Which is which?
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How to call a Parent Class's method from Child Class in Python?
...archy in Python, I'd like to be able to invoke methods of the parent class from a derived class. In Perl and Java, there is a keyword for this ( super ). In Perl, I might do this:
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How do you use String.substringWithRange? (or, how do Ranges work in Swift?)
...] // "Strin"
str.substring(to: startIndex) // "My "
str.substring(from: startIndex) // "String"
Swift 4
substring(to:) and substring(from:) are deprecated in Swift 4.
String(str[..<startIndex]) // "My "
String(str[startIndex...]) // "String"
String(str[startIndex...endIndex]) ...
Relative imports in Python 2.7
...difference between directly running a Python file, and importing that file from somewhere else. Just knowing what directory a file is in does not determine what package Python thinks it is in. That depends, additionally, on how you load the file into Python (by running or by importing).
There are...
Post-install script with Python setuptools
...lling a source distribution zip or tarball, or installing in editable mode from a source tree. It will not work when installing from a binary wheel (.whl)
This solution is more transparent:
You will make a few additions to setup.py and there is no need for an extra file.
Also you need to consi...