Although not mentioned in glibc documentation or getopt man page, optional arguments to long style command line parameters require ‘equals sign’ (=). Space separating the optional argument from the parameter does not work. An example run with the test code: $ ./respond –praise John Kudos to John $ ./respond –praise=John Kudos to John $ ./respond … Read more
No. A workaround is to overload with another method that doesn’t have out / ref parameters, and which just calls your current method. public bool SomeMethod(out string input) { … } // new overload public bool SomeMethod() { string temp; return SomeMethod(out temp); } If you have C# 7.0, you can simplify: // new overload … Read more
Let’s look at an example: def f(value, key, hash={}): hash[value] = key return hash print(f(‘a’, 1)) print(f(‘b’, 2)) Which you probably expect to output: {‘a’: 1} {‘b’: 2} But actually outputs: {‘a’: 1} {‘a’: 1, ‘b’: 2}
Python 3.7 Use the defaults parameter. >>> from collections import namedtuple >>> fields = (‘val’, ‘left’, ‘right’) >>> Node = namedtuple(‘Node’, fields, defaults=(None,) * len(fields)) >>> Node() Node(val=None, left=None, right=None) Or better yet, use the new dataclasses library, which is much nicer than namedtuple. >>> from dataclasses import dataclass >>> from typing import Any >>> … Read more
An automatic way: foo.plot <- function(x,y,…) { lnames <- names(formals(legend)) pnames <- c(names(formals(plot.default)), names(par())) dots <- list(…) do.call(‘plot’, c(list(x = x, y = x), dots[names(dots) %in% pnames])) do.call(‘legend’, c(“bottomleft”, “bar”, pch = 1, dots[names(dots) %in% lnames])) } pch must be filtered from the lnames to avoid duplication in the legend call in case the user … Read more
Just use the *args parameter, which allows you to pass as many arguments as you want after your a,b,c. You would have to add some logic to map args->c,d,e,f but its a “way” of overloading. def myfunc(a,b, *args, **kwargs): for ar in args: print ar myfunc(a,b,c,d,e,f) And it will print values of c,d,e,f Similarly you … Read more