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Stop pip from failing on single package when installing with requirements.txt
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'main' is not a part of pip. Error.
– Pranzell
Jul 29 '19 at 14:29
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How do I create an abstract base class in JavaScript?
...imal = function() {
if (this.constructor === Animal) {
throw new Error("Can't instantiate abstract class!");
}
// Animal initialization...
};
/**
@abstract
*/
Animal.prototype.say = function() {
throw new Error("Abstract method!");
}
The Animal "class" and the say method a...
How is Racket different from Scheme?
.../6RS Scheme that runs in racket mode may either be rejected, cause runtime errors, or behave differently than it should. With that said, the main points where it is not backwards compatible are:
Racket has no set-cdr! and set-car!, rather set-mcar! which only works on pairs specifically created as...
Define a lambda expression that raises an Exception
...ollowing also works: lambda: 1 / 0. You'll just end up with a ZeroDivisionError being thrown instead of a regular exception. Bear in mind that if the exception is allowed to propogate, it may look strange to someone debugging your code to start seeing a bunch of ZeroDivisionErrors.
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Undo git reset --hard with uncommitted files in the staging area
...e of problems - --cached should be --cache, and I found that it didn't actually create the .git/lost-found directory. However, the following steps worked for me:
git fsck --cache --unreachable $(git for-each-ref --format="%(objectname)")
That should output all objects in the object database that...
How to suppress scientific notation when printing float values?
...cify how many digit after the . you wish to display, this depends on how small is the floating number). See this example:
>>> a = -7.1855143557448603e-17
>>> '{:f}'.format(a)
'-0.000000'
as shown above, default is 6 digits! This is not helpful for our case example, so instead we...
Get the latest record from mongodb collection
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For anyone using AWS DocDB: Query failed with error code 303 and error message 'option $natural is not supported' on server docdb. Hopefully that feature comes soon.
– Marc
Apr 12 '19 at 18:58
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matplotlib does not show my drawings although I call pyplot.show()
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I tried but I got an error something like: ImportError: No module named _backend_gdk
– Baskaya
Sep 30 '11 at 18:15
6
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how to change default python version?
I have installed python 3.2 in my mac. After I run /Applications/Python 3.2/Update Shell Profile.command , it's confusing that when I type python -V in Terminal it says that Python 2.6.1 , how can I change the default python version?
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Defining private module functions in python
...ent call last):
File "<stdin>", line 1, in <module>
AttributeError: 'Foo' object has no attribute '__bar'
>>> myFoo.PrintBar() # the class itself of course can access it
99
>>> dir(Foo) # yet can see it
['PrintBar', '_Foo__bar', '__class__', '__delattr__', '__dict...