...Error: The truth value of an array is ambiguous. Use a.empty, a.any() or a.all(). when used as a boolean value. That's because its unclear when it should be True or False. Some users might assume they are True if they have non-zero length, like a Python list. Others might desire for it to be True ...

... Explanation: People coming from a C++/Java background are especially prone to overusing/misusing this "feature". But __private names don't work the same way as in Java or C++. They just trigger a name mangling whose purpose is to prevent accidental namespace collisions in subclasses...

...d index order as shown. If you need to preserve this order, then you basically have two options. So let's say that you were matching on the values of _id in your documents with an array that is going to be passed in to the $in as [ 4, 2, 8 ]. Approach using Aggregate var list = [ 4, 2, 8 ]; ...

...is also used in lots of 3rd-party modules, so it's the quasi-standard. Usually, __version__ is a string, but sometimes it's also a float or tuple. Edit: as mentioned by S.Lott (Thank you!), PEP 8 says it explicitly: Module Level Dunder Names Module level "dunders" (i.e. names with two lea...

... It runs when a shared library is loaded, typically during program startup. That's how all GCC attributes are; presumably to distinguish them from function calls. GCC-specific syntax. Yes, this works in C and C++. No, the function does not need to be static. The destructo...

...erf, you can have different levels of efficiency for creating a regex, but all of them are significantly slower than a simple string replace. The regex is slower because: Fixed-string matches don't have backtracking, compilation steps, ranges, character classes, or a host of other features that ...

...own, just like simple variable initializers) when the class is loaded (actually, when it's resolved, but that's a technicality). Instance initializers are executed in the order defined when the class is instantiated, immediately before the constructor code is executed, immediately after the invocat...

...specific, and are slightly more detailed than some others have suggested. All identifiers that contain a double underscore or start with an underscore followed by an uppercase letter are reserved for the use of the implementation at all scopes, i.e. they might be used for macros. In addition, all ...

... as it doesn't need to be editing .rst files. – jcarballo Aug 27 '13 at 17:44 9 In Sphinx 1.2.1, ...

...lay a value nicely, you can use the pprint module. The easiest way to dump all variables with it is to do from pprint import pprint pprint(globals()) pprint(locals()) If you are running in CGI, a useful debugging feature is the cgitb module, which displays the value of local variables as part of...