dont-parse-options-after-the-last-positional-argument#example

$ cat a.py 
#!/usr/bin/python3

import argparse

p = argparse.ArgumentParser()
p.add_argument('-a', action='store_true')
p.add_argument('-qa', nargs='?')
p.add_argument('-qb', nargs='?')
p.add_argument('command', nargs=argparse.REMAINDER)
print(p.parse_known_args())

$ python3 ./a.py aa -q
usage: a.py [-h] [-a] [-qa [QA]] [-qb [QB]] ...
a.py: error: ambiguous option: -q could match -qa, -qb

Oddly, it still gives the same error.

$ cat a.py

#!/usr/bin/python3

import argparse

p = argparse.ArgumentParser(allow_abbrev=False)
p.add_argument('-a', action='store_true')
p.add_argument('-qa', nargs='?')
p.add_argument('-qb', nargs='?')
p.add_argument('command', nargs=argparse.REMAINDER)
print(p.parse_known_args())

$ ./a.py aa -q

usage: a.py [-h] [-a] [-qa [QA]] [-qb [QB]] ...
a.py: error: ambiguous option: -q could match -qa, -qb