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What is the easiest way to remove all packages installed by pip?

...ng command in place requirements.txt). pip freeze > requirements.txt Now to remove one by one pip uninstall -r requirements.txt If we want to remove all at once then pip uninstall -r requirements.txt -y If you're working on an existing project that has a requirements.txt file and your e...
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Direct casting vs 'as' operator?

...n explicitly defined, e.g.: int? i; string s = "5"; i = s as int; // i is now 5 s = null; i = s as int; // i is now null – Anheledir Sep 25 '08 at 10:41 3 ...
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What is the opposite of :hover (on mouse leave)?

... @Cthulhu - I've edited my answer now. That might help a bit more. I thought that was too obvious an answer. – SpaceBeers Jun 12 '12 at 11:07 ...
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Conversion from Long to Double in Java

... I did. Parsing a string to do this (now edited out of the answer) will degrade performance by many orders of magnitude. Boxing is less expensive but still worth avoiding, especially in cases like this (using new) where it can't be elided away. ...
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What are the typical reasons Javascript developed on Firefox fails on IE? [closed]

... on recent Firefox and Safari. I missed to check in Internet Explorer, and now I find the pages don't work on IE 6 and 7 (so far). The scripts are somehow not executed, the pages show as if javascript wasn't there, although some javascript is executed. I am using own libraries with dom manipulation,...
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How to trigger a build only if changes happen on particular set of files

...s://github.com/jenkinsci/git-plugin/pull/49 Update: The Git plugin (1.16) now has the 'included' region feature. share | improve this answer | follow | ...
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Import and Export Excel - What is the best library? [closed]

... github.com/OfficeDev/Open-XML-SDK it's now opensource and github-hosted (I like where MS is headed recently) – Alex Dec 3 '14 at 9:37 ...
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One line ftp server in python

... Right, I do deserve down-voting, but really, people should know Twisted. And of course Twisted is in the base install of many Linuxes. – Ali Afshar Feb 14 '11 at 17:42 ...
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Partly cherry-picking a commit with Git

... I know I'm answering an old question, but it looks like there's a new way to do this with interactively checking out: git checkout -p bc66559 Credit to Can I interactively pick hunks from another git commit? ...
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Tools for JPEG optimization? [closed]

Do you know of any tools (preferrably command-line) to automatically and losslessly optimize JPEGs that I could integrate into our build environment? For PNGs I'm currently using PNGOUT , and it generally saves around 40% bandwidth/image size. ...