TL;DR A single argument must be shorter than MAX_ARG_STRLEN. Analysis According to this link: And as additional limit since 2.6.23, one argument must not be longer than MAX_ARG_STRLEN (131072). This might become relevant if you generate a long call like “sh -c ‘generated with long arguments’”. This is exactly the “problem” identified by the OP. … Read more
I am writing this answer, because the best answer yet was in a comment by lurker. I want to have it show up as an actual answer. Your code is not working, because you’re doing R1 is R+1 when R isn’t instantiated in the case not_number([X|T], R). Your recursive case is strung a little backwards. … Read more
The language doesn’t support such syntax. The usual workaround for these situations(*) is to use a default value which is not a valid input. def func(n=5.0, delta=None): if delta is None: delta = n/10 (*) Similar problems arise when the default value is mutable.
Unnamed parameters are perfectly valid. The Parameter declaration from the spec: ParameterDecl = [ IdentifierList ] [ “…” ] Type . As you can see, the IdentifierList (the identifier name or names) is in square brackets, which means it’s optional. Only the Type is required. The reason for this is because the names are not … Read more
There is a difference in the * usage when you are defining a variable and when you are using it. In declaration, int *myVariable; Means a pointer to an integer data type. In usage however, *myVariable = 3; Means dereference the pointer and make the structure it is pointing at equal to three, rather then … Read more
If you’re using older C++ variants (pre-C++0x), then this is not allowed. The “anonymous array” you refer to is actually an initializer list. Now that C++11 is out, this can be done with the built-in initializer_list type. You theoretically can also use it as a C-style initializer list by using extern C, if your compiler … Read more
Is it possible to remove or disable an argument in argparse, such that it does not show in the help? Set help to argparse.SUPPRESS when you add the argument, like this: parser.add_argument(‘–arg1’, help=argparse.SUPPRESS) This will prevent the argument from showing up in the default help output.
Function.arguments is deprecated, but it’s only deprecated in favor of the vanilla arguments object that’s available within a function. (e.g. using x = arguments[i]; instead of x = theFunc.arguments[i];) That’s now the preferred (and as you say, extremely useful) method for accessing the ordinal arguments received.
Yes, this is possible, but it’s not very elegant. You’ll have to use the parameters method, which returns an array of the method’s parameters and their types (in this case we only have keyword arguments). def foo(one: 1, two: 2, three: 3) method(__method__).parameters end #=> [[:key, :one], [:key, :two], [:key, :three]] Knowing that, there’s various … Read more