[英]Python to search keyword starts with and Replace in file
I have file1.txt which has below contents 我有file1.txt,其中包含以下内容
if [ "x${GRUB_DEVICE_UUID}" = "x" ] || [ "x${GRUB_DISABLE_LINUX_UUID}" = "xtrue" ] \
|| ! test -e "/dev/disk/by-uuid/${GRUB_DEVICE_UUID}" \
|| uses_abstraction "${GRUB_DEVICE}" lvm; then
LINUX_ROOT_DEVICE=${GRUB_DEVICE}
else
LINUX_ROOT_DEVICE=UUID=${GRUB_DEVICE_UUID}
fi
GRUBFS="`${grub_probe} --device ${GRUB_DEVICE} --target=fs 2>/dev/null || true`"
Linux_CMDLINE="nowatchdog rcupdate.rcu_cpu_stall_suppress=1"
I want to find string starts with Linux_CMDLINE=" and replace that line with Linux_CMDLINE="" 我想找到以Linux_CMDLINE =“开头的字符串,并将该行替换为Linux_CMDLINE =”“
I tried below code and it is not working. 我试过下面的代码,它不起作用。 Also I am thinking it is not best way to implement.
我也认为这不是最佳的实施方法。 Is there any easy method to achieve this?
有没有简单的方法可以做到这一点?
with open ('/etc/grub.d/42_sgi', 'r') as f:
newlines = []
for line in f.readlines():
if line.startswith('Linux_CMDLINE=\"'):
newlines.append("Linux_CMDLINE=\"\"")
else:
newlines.append(line)
with open ('/etc/grub.d/42_sgi', 'w') as f:
for line in newlines:
f.write(line)
output expected: 预期输出:
if [ "x${GRUB_DEVICE_UUID}" = "x" ] || [ "x${GRUB_DISABLE_LINUX_UUID}" = "xtrue" ] \
|| ! test -e "/dev/disk/by-uuid/${GRUB_DEVICE_UUID}" \
|| uses_abstraction "${GRUB_DEVICE}" lvm; then
LINUX_ROOT_DEVICE=${GRUB_DEVICE}
else
LINUX_ROOT_DEVICE=UUID=${GRUB_DEVICE_UUID}
fi
GRUBFS="`${grub_probe} --device ${GRUB_DEVICE} --target=fs 2>/dev/null || true`"
Linux_CMDLINE=""
repl = 'Linux_CMDLINE=""'
with open ('/etc/grub.d/42_sgi', 'r') as f:
newlines = []
for line in f.readlines():
if line.startswith('Linux_CMDLINE='):
line = repl
newlines.append(line)
Minimal code thanks to open file for both reading and writing? 最小的代码感谢打开文件的读写能力?
# Read and write (r+)
with open("file.txt","r+") as f:
find = r'Linux_CMDLINE="'
changeto = r'Linux_CMDLINE=""'
# splitlines to list and glue them back with join
newstring = ''.join([i if not i.startswith(find) else changeto for i in f])
f.seek(0)
f.write(newstring)
f.truncate()
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