Question

我正在尝试设置一个重写interfaces文件的脚本，最终它会将ip地址更改为static，但是当我运行它时，我得到一个错误，该行显示为'new_location_interfaces.truncate（）'它说'str'对象没有属性截断。

from sys import argv
from os.path import exists
import os

script_name = argv

print "You are currently running %s" % script_name
print "Version: 0.1"
print """Desciption: This script will change the IP address of the
Raspberry Pi from dynamic to static.
"""
print "If you don\'t want to continue, hit CTRL-C (^C)."
print "If you do want that, hit RETURN"

raw_input("?")

# Main code block

text_to_copy = """
auto lo\n
iface lo inet loopback
iface etho inet dhcp\n
allow-hotplug wlan0
iface wlan0 inet manual
wpa-roam /etc/wpa_supplicant/wpa_supplicant.conf
iface default inet dhcp
"""

if exists("/etc/network/interfaces"):
    print "\nFile exists."
    interfaces_file = open("/etc/network/interfaces", 'w')
    print "Truncating/erasing contents . ."
    interfaces_file.truncate()
    print "Writing contents . ."
    interfaces_file.write(text_to_copy)
    interfaces_file.close()
else:
    print "\nCould not find the \'interfaces\' file."
    print "Please specify the location:",
    new_location_interfaces = raw_input()
    open(new_location_interfaces, 'w')
    print "Truncating/erasing contents . ."
    new_location_interfaces.truncate()
    print "Writing contents . ."
    new_location_interfaces.write(text_to_copy)
    new_location_interfaces.close()

我是python的新手，我的代码可能很糟糕，但任何帮助都会受到赞赏。

Answer 1

new_location_interfaces不是文件对象。它是一个字符串，是raw_input()调用的结果：

new_location_interfaces = raw_input()

下一行open()调用未分配给任何内容：

open(new_location_interfaces, 'w')

也许您想要截断那个对象？

例如：

new_location_interfaces = raw_input()
fh = open(new_location_interfaces, 'w')
print "Truncating/erasing contents . ."
fh.truncate()
print "Writing contents . ."
fh.write(text_to_copy)
fh.close()

但是，打开要写入的文件（模式设置为w）已截断文件，您的.truncate()调用完全是多余的。

Python语法截断错误

1 个答案: