optparse和bash选项卡完成的怪异行为

Question

I am building a script for users new to Linux, so please understand why I am asking this :)

My script runs like this:

python script.py -f filename.txt

I am using the optparse module for this. However, I noticed the following when doing tab completion.

The tab completion works when I do:

python script.py <tab completion> # Tab completion works normally as expected

But it does not work when I do it like this:

python script.py -f <tab completion> # No type of tab completion works here.

I really don't want my users typing the name of the input file. Tab completion is a must. How can I get it working or what am I doing wrong here?

Answer 1

This is more to do with how bash works than how python works. Experimenting a bit, it looks as if the second and further TAB actually causes bash to expand.

Edit : The probable reason that bash is only expanding the *.py and *.pyc files is because the first word on the line is python . If you add #! /usr/bin/env python #! /usr/bin/env python to the first line of the python script, chmod +x script.py and then try ./scipt.py -f and tab completion, what happens then? I suspect it'll work just fine.

Answer 2

This is related to bash completion. Try to see whether you have your own bash_completion script and look for python.

The common completion file is in /etc/bash_completion and you should have something like

if [ -f /etc/bash_completion ] && ! shopt -oq posix; then
    . /etc/bash_completion
fi

in your .bashrc (_profile or whatever).

Now you can redefine some behavior by adding your own script. Take a look at the /etc/bash_completion file for some inspiration. :)

Answer 3

如果您希望用户获得简化的体验（即他们不需要了解Shell的工作方式以及在特定安装中如何配置外壳），则您的程序应构建一个输入文件列表，并向用户显示该文件他们的选择。