What exactly do *args and **kwargs mean? According to the Python documentation, from what it seems, it passes in a tuple of arguments. def foo (hello, *args): print (hello) for each in args:...

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.

I am trying to pass a list as an argument to a command line program. Is there an argparse option to pass a list as option? parser.add_argument('-l', '--list', type=list, acti...

So I have difficulty with the concept of *args and **kwargs. So far I have learned that: *args = list of arguments - as positional arguments **kwargs = dictionary - whose keys become separate …

Feb 28, 2020 · ARG before the first FROM are only useful to allow variables in the FROM line and to supply defaults, but can't be used otherwise. This is further discussed under Understand …

I am using RUN instruction within a Dockerfile to install a rpm RUN yum -y install samplerpm-2.3 However, I want to pass the value "2.3" as an argument. My RUN instruction should look …

Parameters starting with - or -- are usually considered optional. All other parameters are positional parameters and as such required by design (like positional function arguments). It is possible …

Mar 19, 2019 · The ARG defines a variable to be used inside the dockerfile in subsequent commands. The ENV defines an environment variable which is passed to the container.

This answer is very useful, it actually shows how docker-compose can be used with --build-arg on command-line, you can define your ARG in Dockerfile, docker-compose.yml - the :args array …

Apr 27, 2017 · Accepted answer does not cover "if else condition" part of the question. Would be better to rename it to "Dockerfile with external arguments" if condition check didn't mean to be …