Python getopt module processes command line option instances

The getopt module is used to extract command line options and parameters, that is, sys. argv
The command line option makes program parameters more flexible. Supports short and long options.
For example, python scriptname. py-f 'hello' -- directory-prefix =/home-t -- format 'A'
Copy codeThe Code is as follows:
Import getopt, sys
Shortargs = 'f: t'
Longargs = ['Directory-prefix = ', 'format']
Opts, args = getopt. getopt (sys. argv [1:], shortargs, longargs)

Getopt. getopt ([command line parameter list], 'short options', [long optionlist])

Colon after short option name: indicates that this option must have additional parameters
Equal Sign = after long option name indicates that this option must have additional parameters

Returns opts and args
Opts is a parameter option and its value tuples ('-F', 'Hello'), ('-t', ''), ('-- format ', ''), ('-- directory-prefix','/home '))
Args is a command line input ('A', 'B') that removes useful parameters ')

Copy codeThe Code is as follows: # traverse opts to obtain all command line options and their corresponding parameters.
For opt, val in opts:
If opt in ('-F',' -- format '):
Pass
If ....

Use the dictionary to accept the input of the command line and then transmit the dictionary, which makes the interface of the command line parameters more robust.

# Two examples from python2.5 Documentation
Copy codeThe Code is as follows:
>>> Import getopt, sys
>>> Arg = '-a-B-c foo-d bar a1 a2'
>>> Optlist, args = getopt. getopt (sys. argv [1:], 'abc: d :')
>>> Optlist
[('-A', ''), ('-B ',''), ('-C', 'foo'), ('-d ', 'bar')]
>>> Args
['A1', 'a2 ']

>>> Arg = '-- condition = foo -- testing -- output-file abc. def-x a1 a2'
>>> Optlist, args = getopt. getopt (sys. argv [1:], 'x', ['condition = ', 'output-file =', 'testing'])
>>> Optlist
[('-- Condition', 'foo'), ('-- testing', ''), ('-- output-file', 'abc. def '), ('-x', '')]
>>> Args
['A1', 'a2 ']