...clared outside the function, regardless of when and where the function is called. If a function was called by a function, which in turn was called by another function, then a chain of references to outer lexical environments is created. This chain is called the scope chain. In the following code, in...

In all other languages I've worked with the super constructor is invoked implicitly. How does one invoke it in Python? I would expect super(self) but this doesn't work. ...

...ing on. Better late than never. You can add a property to a class dynamically. But that's the catch: you have to add it to the class. >>> class Foo(object): ... pass ... >>> foo = Foo() >>> foo.a = 3 >>> Foo.b = property(lambda self: self.a + 1) >>&...

...335 0.712] And suppress suppresses the use of scientific notation for small numbers: y=np.array([1.5e-10,1.5,1500]) print(y) # [ 1.500e-10 1.500e+00 1.500e+03] np.set_printoptions(suppress=True) print(y) # [ 0. 1.5 1500. ] See the docs for set_printoptions for other options. T...

.... } while (0) idiom ensures that the code acts like a statement (function call). The unconditional use of the code ensures that the compiler always checks that your debug code is valid — but the optimizer will remove the code when DEBUG is 0. If you want to work with #ifdef DEBUG, then change th...

...e a method like isiterable ? The only solution I have found so far is to call 21 Answers ...

...). The most common reason to want such a type is when memoizing function calls for functions with unknown arguments. The most common solution to store a hashable equivalent of a dict (where the values are hashable) is something like tuple(sorted(kwargs.iteritems())). This depends on the sorting n...

...se addresses are larger than the older IPv4 addresses. (Note that IPv6 usually uses 39 characters at most but there is also a special IPv6 notation for IPv4 addresses which in its full form can be up to 45 characters. So if you know what you are doing you can use 39 characters, but if you just want...

... so are numerous, to list some of them: Support for descriptors. Specifically, the following constructs are made possible with descriptors: classmethod: A method that receives the class as an implicit argument instead of the instance. staticmethod: A method that does not receive the implicit ar...

...a notation "Θ" (which is a two-side bound). In my experience, this is actually typical of discussions in non-academic settings. Apologies for any confusion caused. Big O complexity can be visualized with this graph: The simplest definition I can give for Big-O notation is this: Big-O notation is ...