Why isn't fromfile-prefix-chars in Python argparse working?

Question

I\'m trying to use the fromfile-prefix-chars feature of argparse in Python to load all my command line arguments from a file, but it keeps complaining that I haven\'t specif

Answer 1

The problem is that, when specified in a file, each argument must have an '=' between it and the option name. While argparse is somewhat more flexible on that format when run from the command line (where space or = is ok), when run from the file it must have an '='.

So, a working argument file would be:

--option1=foo
--option2=1234

Something else to be aware of, be sure you don't have any extra whitespace at the end of the lines or that whitespace will get included with the option when argparse reads the file.