在Jython中解析命令行
经常会需要对命令行参数进行比 sys.argv 所提供的更多的处理。parseArgs 函数可以用于作为一组位置参数和一个开关字典得到任意的命令行参数。
因此，继续 JavaUtils.py模块片段，我们看到：
def parseArgs (args, validNames, nameMap=None):
""" Do some simple command line parsing. """
# validNames is a dictionary of valid switch names -
# the value (if any) is a conversion function
switches = {}
positionals = []
for arg in args:
if arg[0] == '-': # a switch
text = arg[1:]
name = text; value = None
posn = text.find(':') # any value comes after a :
if posn >= 0:
name = text[:posn]
value = text[posn + 1:]
if nameMap is not None: # a map of valid switch names
name = nameMap.get(name, name)
if validNames.has_key(name): # or - if name in validNames:
mapper = validNames[name]
if mapper is None: switches[name] = value
else: switches[name] = mapper(value)
else:
print "Unknown switch ignored -", name
else: # a positional argument
positionals.append(arg)
return positionals, switches
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可以如下使用这个函数（在文件 parsearg.py 中）：
from sys import argv
from JavaUtils import parseArgs
switchDefs = {'s1':None, 's2':int, 's3':float, 's4':int}
args, switches = parseArgs(argv[1:], switchDefs)
print "args:", args
print "switches:", switches
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对于命令c:\>jython parsearg.py 1 2 3 -s1 -s2:1 ss -s4:2，它打印：
args: ['1', '2', '3', 'ss']
switches: {'s4': 2, 's2': 1, 's1': None}
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这样就实现了在Jython中解析命令行。
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