pythonrc.py 文件源码

def process_sh_cmd(self, cmd):
        """{SH_EXEC} [cmd [args ...] | {{fmt string}}]

        Escape to {SHELL} or execute `cmd` in {SHELL}

        - without arguments, the current interpreter will be suspended
          and you will be dropped in a {SHELL} prompt. Use fg to return.

        - with arguments, the text will be executed in {SHELL} and the
          output/error will be displayed. Additionally '_' will contain
          a named tuple with the (<stdout>, <stderror>, <return_code>)
          for the execution of the command.

          You may pass strings from the global namespace to the command
          line using the `.format()` syntax. for example:

        >>> filename = '/does/not/exist'
        >>> !ls {{filename}}
        ls: cannot access /does/not/exist: No such file or directory
        >>> _
        CmdExec(out='', err='ls: cannot access /does/not/exist: No such file or directory\n', rc=2)
        """
        if cmd:
            try:
                cmd = cmd.format(**self.locals)
                cmd = shlex.split(cmd)
                if cmd[0] == 'cd':
                    os.chdir(os.path.expanduser(os.path.expandvars(' '.join(cmd[1:]) or '${HOME}')))
                else:
                    cmd_exec = namedtuple('CmdExec', ['out', 'err', 'rc'])
                    process = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
                    out, err = process.communicate()
                    rc = process.returncode
                    print (red(err.decode('utf-8')) if err else green(out.decode('utf-8'), bold=False))
                    builtins._ = cmd_exec(out, err, rc)
                    del cmd_exec
            except:
                self.showtraceback()
        else:
            if os.getenv('SSH_CONNECTION'):
                # I use the bash function similar to the one below in my
                # .bashrc to directly open a python prompt on remote
                # systems I log on to.
                #   function rpython { ssh -t $1 -- "python" }
                # Unfortunately, suspending this ssh session, does not place me
                # in a shell, so I need to create one:
                os.system(config['SHELL'])
            else:
                os.kill(os.getpid(), signal.SIGSTOP)