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# ishelve2.py
import os
import shelve
import plac
class ShelveInterface(object):
"A minimal interface over a shelve object."
commands = 'set', 'show', 'showall', 'delete'
@plac.annotations(
configfile=('path name of the shelve', 'option'))
def __init__(self, configfile):
self.configfile = configfile or 'conf.shelve'
self.fname = os.path.expanduser(self.configfile)
self.__doc__ += ('\nOperating on %s.\nUse help to see '
'the available commands.\n' % self.fname)
def __enter__(self):
self.sh = shelve.open(self.fname)
return self
def __exit__(self, etype, exc, tb):
self.sh.close()
def set(self, name, value):
"set name value"
yield 'setting %s=%s' % (name, value)
self.sh[name] = value
def show(self, *names):
"show given parameters"
for name in names:
yield '%s = %s' % (name, self.sh[name]) # no error checking
def showall(self):
"show all parameters"
for name in self.sh:
yield '%s = %s' % (name, self.sh[name])
def delete(self, name=''):
"delete given parameter (or everything)"
if name == '':
yield 'deleting everything'
self.sh.clear()
else:
yield 'deleting %s' % name
del self.sh[name] # no error checking
if __name__ == '__main__':
plac.Interpreter(plac.call(ShelveInterface)).interact()
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