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Can existing virtualenv be upgraded gracefully?
...e:
python -m venv --upgrade YOUR_VENV_DIRECTORY
I just upgraded my venv from Python 3.7.x to 3.8 on several projects without any issue.
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Preserve colouring after piping grep to grep
...e with your downstream program.
But if you want colorized output emanating from earlier commands, you need to force color codes to be produced regardless of the output sink. The forcing mechanism is program-specific.
Git: use -c color.status=always
git -c color.status=always status | grep -v .DS_Sto...
How to close off a Git Branch?
... running git push origin :branchname. To fix a new issue later, branch off from master again.
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How to use a custom comparison function in Python 3?
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A complete python3 cmp_to_key lambda example:
from functools import cmp_to_key
nums = [28, 50, 17, 12, 121]
nums.sort(key=cmp_to_key(lambda x, y: 1 if str(x)+str(y) < str(y)+str(x) else -1))
compare to common object sorting:
class NumStr:
def __init__(self, v)...
Clone contents of a GitHub repository (without the folder itself)
...reates the .git directory in your current folder, not just the source code from your project.
This optional [directory] parameter is documented in the git clone manual page, which points out that cloning into an existing directory is only allowed if that directory is empty.
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Why can't I have abstract static methods in C#?
...h context. For example, if one had a Car type with a virtual static CreateFromDescription factory method, then code which accepted a Car-constrained generic type T could call T.CreateFromDescription to produce a car of type T. Such a construct could be supported pretty well within the CLR if each ...
Where are an UIWebView's cookies stored?
...gs doesn't delete them. Where are they stored? Is it possible to read them from another UIWebView?
4 Answers
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HTTP response code for POST when resource already exists
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I would not go with this. From the same URL referenced in the answer: "For example, this error condition may occur if an XML request body contains well-formed (i.e., syntactically correct), but semantically erroneous, XML instructions." This is the re...
Why use armeabi-v7a code over armeabi code?
...erefore, there are no devices with Android 4 or higher which would benefit from armeabi at all.
This is probably why the Android NDK doesn't even support armeabi anymore as per revision r17b. [source]
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emacs/elisp: What is the hash (pound, number sign, octothorp) symbol used for?
...e top of the Emacs lisp reference index.
Edit: Or even more conveniently, from within Emacs itself:
M-x info RET (open the info browser)
d m elisp RET (open the elisp manual)
I # RET (list the entries for # in the index)
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