Argument parser based on docopt
install
pip install argumentsusage
Docopt is used for parsing the docstring (doc), arguments bundles the schema parser and returns a OptionParser like object with normalized attributes
For example
# coding=utf-8
"""
arguments test
Usage:
tests.py [options] <posarg1> <posarg2>
Options:
-h --help Show this screen.
-o --option=<option1> An option.
--opt2=<option2> An option [default: hello].
-p --parameter=<parameter> Folder to check the git repos out [default: 77].
-v --verbose Folder from where to run the command [default: .].
"""
from arguments import Arguments
def main():
"""
main
"""
arg = Arguments()
print(arg)
if __name__ == "__main__":
main()gives
$ python main.py pval1 pval2
<arguments.Arguments object at 0x1022e0eb8>
options :
opt2 : hello
option : None
parameter : 77
help : False
verbose : False
positional :
posarg1 : pval1
posarg2 : pval2usage with classes
A nested docker style commandline program (python3)
class BaseArguments(arguments.Arguments):
def __init__(self, doc):
...
class MainArguments(BaseArguments):
def __init__(self):
doc = """
Some tools.
Usage:
classbased.py [options] [--] <tool> [<args>...]
Options:
-h --help Show this screen..
-v --verbose Verbose mode.
Commands:
tool1 Tool1 description here
tool2 Tool2 ...
"""
super().__init__(doc)
class Tool1Arguments(BaseArguments):
def __init__(self):
doc = """
Tool 1
Usage:
classbased.py tool1 [options] [--] <command> [<args>...]
Options:
-h --help Show this screen..
-v --verbose Verbose mode.
Commands:
run Run the tool
build Build the tool
"""
super().__init__(doc)
class Tool2Arguments(BaseArguments):
def __init__(self):
doc = """
Tool 2
Usage:
classbased.py tool2 [options] [--] <command> [<args>...]
Options:
-h --help Show this screen..
-v --verbose Verbose mode.
Commands:
upload Upload something
delete Delete something
"""
super().__init__(doc)$ python classbased.py
Usage:
classbased.py [options] [--] <tool> [<args>...]$ python classbased.py -h
Some tools.
Usage:
classbased.py [options] [--] <tool> [<args>...]
Options:
-h --help Show this screen..
-v --verbose Verbose mode.
Commands:
tool1 Tool1 description here
tool2 Tool2 ...$ python classbased.py tool1 run
<__main__.Tool1Arguments object at 0x10d45cac8>
options:
help: False
verbose: False
positional:
args: []
command: runUsing schema
Assume you are using docopt with the following usage-pattern:
my_program.py [--count=N] <path> <files>and you would like to validate that <files> are readable, and that <path> exists, and that --count is either integer from 0 to 5, or None.
this is how you validate it using schema:
>>> from arguments import *
>>> s = Schema({'<files>': [Use(open)],
... '<path>': os.path.exists,
... '--count': Or(None, And(Use(int), lambda n: 0 < n < 5))})
>>> args = Arguments(validateschema=s)
>>> args.files
[<open file 'LICENSE-MIT', mode 'r' at 0x...>, <open file 'setup.py', mode 'r' at 0x...>]
>>> args.path
'../'
>>> args.count
3As you can see, it validated data successfully, opened files and converted '3' to int.
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