在 Python 2.7 中从 print 中删除括号和引号

Question

我正在尝试使用 Python 2.7 从打印语句中删除括号我尝试了各种论坛的建议，但没有按预期工作，最终想到自己在这里问。

代码：

    with open('buttonpress_and_commandstarted','r') as buttonpress_commandstarted:
        for line in buttonpress_commandstarted:
            button_press_command_time = ''
            if os.path.getsize('buttonpress_and_commandstarted') > 0:               
                button_press_command_time = line.split()[2]
            else:
                print "   > Cannot get time stamp as the file is empty"
            button_press = re.findall(r"\:12\:(.*?)\.",line)
            command_executed = re.findall(r"\:4\:(.*?) started\.",line)
            with open('timestamp_buttons_and_commands', 'w') as timestamp_buttons_and_commands:
                timestamp_buttons_and_commands.write(str(button_press_command_time) + str(button_press) + str(command_executed))

            with open("timestamp_buttons_and_commands", "r+") as timestamp_buttons_and_commands:
                contents = timestamp_buttons_and_commands.readlines()
                from string import join 
                result = ''.join(contents)
            print result

我不确定自己在做什么错误。我得到以下输出

00:22:12['Button 9 pressed'][]
00:22:13['Button 9 pressed'][]
00:22:14['Button 9 pressed'][]
00:22:15['Button 9 pressed'][]
00:22:15[]['Command MediaCodec (2)']
00:22:17['Button 9 pressed'][]
00:22:19['Button 9 pressed'][]
00:22:19[]['Command SetSensorFormat (3)']
00:22:22[]['CDC']
00:22:22[]['Command Hello']
00:22:22[]['Command Hello']
00:22:22[]['Command Hello']
00:22:22[]['Command Hello']
00:22:22[]['Command Hello']
00:22:25['Button 10 pressed'][]

但我不想要括号和引号

Answer 1

re.findall 返回一个列表。当您执行str(someList) 时，它将打印括号和逗号：

>>> l = ["a", "b", "c"]
>>> print str(l)
['a', 'b', 'c']

如果您想在没有[ 和, 的情况下打印，请使用join：

>>> print ' '.join(l)
a b c

如果您想在不使用[ 但使用, 的情况下进行打印：

>>> print ', '.join(l)
a, b, c

如果你想保留'，你可以使用repr 和列表理解：

>>> print ', '.join(repr(i) for i in l)
'a', 'b', 'c'

---

编辑后，您的列表中似乎只有 1 个元素。所以你只能打印第一个元素：

>>> l = ['a']
>>> print l
['a']
>>> print l[0]
a