1Commandlines is a Python library for command line application development that 2supports command line argument parsing, command string validation testing, & 3application logic. It has no external dependencies and provides broad Python 4interpreter support. 5 6The library supports application development with POSIX guideline compliant[*] 7command argument styles, the GNU argument style extensions to the POSIX 8guidelines (including long option syntax and variable position of options among 9arguments), and command suite style application arguments that include one or 10more sub-commands to the executable. 11 12[*] with the exception of the short single option-argument definition syntax 13that does not include an intervening space character (e.g. -ofile) 14