Python:循环不会中断

Question

有问题的打破循环。我想在它到达词尾的时候打破它。希望你能帮我，我在这段代码中遗漏了什么。谢谢。

def y():
    with open('test.conf', 'r') as rf:
        x = list()
        for line in rf:
            if 'config system global' in line:
                x.append('config system global\n')
                while True:
                    x.append(rf.__next__())
                    if 'end\n' in line:
                        break

                    with open('test.txt', 'w') as wf:
                        wf.writelines(x)


config system global
    set admin-maintainer disable
    set admin-scp enable
    set admin-server-cert "Fortinet_Firmware"
    set admintimeout 15
    set anti-replay disable
    set fgd-alert-subscription advisory latest-threat
    set gui-dynamic-routing enable
    set gui-multiple-utm-profiles enable
    set gui-replacement-message-groups enable
    set gui-sslvpn-personal-bookmarks enable
    set gui-sslvpn-realms enable
    set gui-wireless-opensecurity enable
    set hostname "XXXXXX"
    set internal-switch-mode interface
    set revision-backup-on-logout enable
    set revision-image-auto-backup enable
    set strong-crypto enable
    set tcp-timewait-timer 120
    set timezone 80
    set vdom-admin enable
end
config system accprofile
    edit "prof_admin"
        set admingrp read-write
        set authgrp read-write
        set endpoint-control-grp read-write
        set fwgrp read-write
        set loggrp read-write
        set mntgrp read-write
        set netgrp read-write
        set routegrp read-write
        set sysgrp read-write
        set updategrp read-write
        set utmgrp read-write
        set vpngrp read-write
        set wanoptgrp read-write
        set wifi read-write

Answer 1

问题是内部while循环：

while True:
    x.append(rf.__next__())
    if 'end\n' in line:
        break

它是一个无限循环，因为line在循环中不会改变。它可能以StopIteration异常结束，除非它被捕获

适当的守则是：

while True:
    line = rf.__next__()
    if 'end\n' in line:
        break
    x.append(line)

根据是否要将end保存在块中，在测试之前或之后追加end。

和缩进：

with open('test.txt', 'w') as wf:
    wf.writelines(x)

在与另一个with块相同的级别上，否则文件将在每次迭代时编写。

Answer 2

尝试使用re module。

Ex:

import re        
for line in s.split("\n"):
    if re.match('end', line):
        break