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What does the “-U” option stand for in pip install -U

Despite a ton of Googling, I can't find any docs for pip's command line options/arguments. What does pip install -U mean? Does anyone have a link to a list of pip's options and arguments? ...
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C++11 emplace_back on vector?

... Yeah, spelling it out helps me understand what you meant! Good point. I agree that sometimes the generalisation is bearable when weighed against the other stuff the STL provides for us: I use that semi-often with pair... but sometimes wonder if I really gain much...
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How to get size of mysql database?

... Run this query and you'll probably get what you're looking for: SELECT table_schema "DB Name", ROUND(SUM(data_length + index_length) / 1024 / 1024, 1) "DB Size in MB" FROM information_schema.tables GROUP BY table_schema; This ...
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error: command 'gcc' failed with exit status 1 while installing eventlet

... FWIW, you definitely need both python-dev and libevent-dev. Thanks! – Alex Whittemore May 17 '13 at 2:00 57 ...
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How to show popup message like in Stack Overflow

...essage like the one that appears on Stack Overflow when I am not logged in and I try to use voting buttons. 6 Answers ...
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Remove the error indicator from a previously-validated EditText widget

I am using an EditText widget, and I am validating it with the setError() method of EditText and it validates correctly. ...
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Why does isNaN(“ ”) (string with spaces) equal false?

...2) Check if that number is the numerical value NaN. That helped me understand it better. – xdhmoore Feb 20 '14 at 23:08 ...
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Can't find Request.GetOwinContext

...he Microsoft.Owin.Host.SystemWeb package. In MVC 5 the pipelines for Api and regular MVC were very different, but often have the same naming conventions. So an extension method in one does not apply to the other. Same for a lot of the action filters etc. ...
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Adding services after container has been built

...a service at run-time, meaning after the ContainerBuilder has been built and the Container has been created (and ContainerBuilder disposed of)? ...
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Configuration With Same Name Already Exists

...g the drop down list from the grid (not the one at the top of the dialog), and do not check the "Create new solution configurations" checkbox when adding your new project configuration. share | impr...