使用“from”作为Python中的脚本参数

Question

My assignment requires that "from" be used as an argument for the command line input.

p = optparse.OptionParser()
p.add_option("--from")
p.add_option("--to")
p.add_option("--file", default="carla_coder.ics")
options, arguments = p.parse_args()

print options.from

obviously, "from" is a Python keyword... is there any way to get around this? Basically, the script should be run using file.py --from=dd/mm/yyyy --to=dd/mm/yyyy --file=file

Answer 1

Use the dest attribute to specify a name:

p.add_option("--from", dest="foo")

print options.foo

Answer 2

Use Python's getattr function:

getattr(options, 'from')

Will behave like options.from , except that the attribute name doesn't have to follow Python's usual variable naming rules (including keyword conflicts).