diff options
| -rw-r--r-- | Doc/lib/liboptparse.tex | 34 |
1 files changed, 17 insertions, 17 deletions
diff --git a/Doc/lib/liboptparse.tex b/Doc/lib/liboptparse.tex index 475c4f4..118c2c4 100644 --- a/Doc/lib/liboptparse.tex +++ b/Doc/lib/liboptparse.tex @@ -29,7 +29,7 @@ parser.add_option("-q", "--quiet", action="store_false", dest="verbose", default=True, help="don't print status messages to stdout") -(options, args) = parser.parse_args() +options, args = parser.parse_args() \end{verbatim} With these few lines of code, users of your script can now do the @@ -302,7 +302,7 @@ parse it: \begin{verbatim} args = ["-f", "foo.txt"] -(options, args) = parser.parse_args(args) +options, args = parser.parse_args(args) \end{verbatim} (Note that if you don't pass an argument list to @@ -335,7 +335,7 @@ argument right up against the option, since \programopt{-n42} (one argument) is equivalent to \programopt{-n 42} (two arguments). \begin{verbatim} -(options, args) = parser.parse_args(["-n42"]) +options, args = parser.parse_args(["-n42"]) print options.num \end{verbatim} @@ -605,7 +605,7 @@ def main(): parser.add_option("-q", "--quiet", action="store_false", dest="verbose") - (options, args) = parser.parse_args() + options, args = parser.parse_args() if len(args) != 1: parser.error("incorrect number of arguments") @@ -1271,7 +1271,7 @@ if you supply \var{callback_args} and/or \var{callback_kwargs} when you define your callback option), the minimal callback function is: \begin{verbatim} -def my_callback (option, opt, value, parser): +def my_callback(option, opt, value, parser): pass \end{verbatim} @@ -1291,7 +1291,7 @@ Here's an example of a callback option that takes no arguments, and simply records that the option was seen: \begin{verbatim} -def record_foo_seen (option, opt, value, parser): +def record_foo_seen(option, opt, value, parser): parser.saw_foo = 1 parser.add_option("--foo", action="callback", callback=record_foo_seen) @@ -1303,7 +1303,7 @@ slightly more interesting example: record the fact that in the command-line. \begin{verbatim} -def check_order (option, opt, value, parser): +def check_order(option, opt, value, parser): if parser.values.b: raise OptionValueError("can't use -a after -b") parser.values.a = 1 @@ -1318,7 +1318,7 @@ a bit of work: the error message and the flag that it sets must be generalized. \begin{verbatim} -def check_order (option, opt, value, parser): +def check_order(option, opt, value, parser): if parser.values.b: raise OptionValueError("can't use %s after -b" % opt) setattr(parser.values, option.dest, 1) @@ -1334,7 +1334,7 @@ you have options that should not be called when the moon is full, all you have to do is this: \begin{verbatim} -def check_moon (option, opt, value, parser): +def check_moon(option, opt, value, parser): if is_full_moon(): raise OptionValueError("%s option invalid when moon full" % opt) setattr(parser.values, option.dest, 1) @@ -1358,7 +1358,7 @@ argument that must be convertible to that type; if you further define Here's an example that just emulates the standard ``store'' action: \begin{verbatim} -def store_value (option, opt, value, parser): +def store_value(option, opt, value, parser): setattr(parser.values, option.dest, value) ... parser.add_option("--foo", @@ -1405,7 +1405,7 @@ Nevertheless, here's a stab at a callback for an option with variable arguments: \begin{verbatim} -def varargs (option, opt, value, parser): +def varargs(option, opt, value, parser): assert value is None done = 0 value = [] @@ -1463,8 +1463,8 @@ type-checking functions. A type-checking function has the following signature: \begin{verbatim} -def check_foo (option : Option, opt : string, value : string) - -> foo +def check_foo(option : Option, opt : string, value : string) + -> foo \end{verbatim} You can name it whatever you like, and make it return any type you @@ -1498,7 +1498,7 @@ later (in the \member{TYPE_CHECKER} class attribute of your \class{Option} subclass): \begin{verbatim} -def check_complex (option, opt, value): +def check_complex(option, opt, value): try: return complex(value) except ValueError: @@ -1509,7 +1509,7 @@ def check_complex (option, opt, value): Finally, the \class{Option} subclass: \begin{verbatim} -class MyOption (Option): +class MyOption(Option): TYPES = Option.TYPES + ("complex",) TYPE_CHECKER = copy(Option.TYPE_CHECKER) TYPE_CHECKER["complex"] = check_complex @@ -1600,13 +1600,13 @@ would result in a list: Again we define a subclass of \class{Option}: \begin{verbatim} -class MyOption (Option): +class MyOption(Option): ACTIONS = Option.ACTIONS + ("extend",) STORE_ACTIONS = Option.STORE_ACTIONS + ("extend",) TYPED_ACTIONS = Option.TYPED_ACTIONS + ("extend",) - def take_action (self, action, dest, opt, value, values, parser): + def take_action(self, action, dest, opt, value, values, parser): if action == "extend": lvalue = value.split(",") values.ensure_value(dest, []).extend(lvalue) |