14.3.3.6 Standard option types
optparse has six built-in option types: string, int, long,
choice, float and complex. If you need to add new option
types, see section 14.3.5, Extending optparse.
Arguments to string options are not checked or converted in any way: the text on the command line is stored in the destination (or passed to the callback) as-is.
Integer arguments (type int or long) are parsed as follows:
-
if the number starts with
0x, it is parsed as a hexadecimal number -
if the number starts with
0, it is parsed as an octal number -
if the number starts with
0b, is is parsed as a binary number -
otherwise, the number is parsed as a decimal number
The conversion is done by calling either int() or long() with
the appropriate base (2, 8, 10, or 16). If this fails, so will optparse,
although with a more useful error message.
float and complex option arguments are converted directly with
float() and complex(), with similar error-handling.
choice options are a subtype of string options. The choices
option attribute (a sequence of strings) defines the set of allowed
option arguments. optparse.check_choice() compares
user-supplied option arguments against this master list and raises
OptionValueError if an invalid string is given.
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Release 2.5, documentation updated on 19th September, 2006.