python - Use of *args and **kwargs - Stack Overflow print required_arg # args is a tuple of positional arguments, # because the parameter name has * prepended if args: # If args is not empty print args # kwargs is a dictionary of keyword arguments, # because the parameter name has ** prepended
dockerfile - How do I set environment variables during the docker . . . ARG is only available during the build of a Docker image (RUN etc), not after the image is created and containers are started from it (ENTRYPOINT, CMD) ENV values are available to containers, but also RUN-style commands during the Docker build starting with the line where they are introduced
c++ - What does int argc, char *argv [] mean? - Stack Overflow The variables are named argc (argument count) and argv (argument vector) by convention, but they can be given any valid identifier: int main(int num_args, char** arg_strings) is equally valid They can also be omitted entirely, yielding int main(), if you do not intend to process command line arguments Try the following program:
docker - How to pass arguments to a Dockerfile? - Stack Overflow As of Docker 1 9, You are looking for --build-arg and the ARG instruction Check out this document for reference This will allow you to add ARG arg to the Dockerfile and then build with docker build --build-arg arg=2 3
How can I pass a list as a command-line argument with argparse? I prefer passing a delimited string which I parse later in the script The reasons for this are; the list can be of any type int or str, and sometimes using nargs I run into problems if there are multiple optional arguments and positional arguments
What does ** (double star asterisk) and * (star asterisk) do for . . . a is a required argument, and its value is 100 b not required, its default value is 10, actual value: 2 args is of type <type 'tuple'> and length 0 kwargs is of type <type 'dict'> and length 4 unknown kwarg - kw: c, arg: 3 unknown kwarg - kw: e, arg: 5 unknown kwarg - kw: d, arg: 4 unknown kwarg - kw: f, arg: 6 Args or kwargs can be passed