【发布时间】：2017-06-17 10:05:05
【问题描述】：
在here 的帮助下，我几乎可以完全按照我想要的方式工作。现在我需要能够添加在比较文件之前从文件中删除数据的功能。
原因是我要删除的字符串“数据”在每次保存文件时都会有所不同。
我已经编写了一个正则表达式来选择我想要删除的确切文本，但是我无法用我当前的代码来实现它。
以下是三个主要功能
HOSTNAME_RE = re.compile(r'hostname +(\S+)')
def get_file_info_from_lines(filename, file_lines):
hostname = None
a_hash = hashlib.sha1()
for line in file_lines:
a_hash.update(line.encode('utf-8'))
match = HOSTNAME_RE.match(line)
if match:
hostname = match.group(1)
return hostname, filename, a_hash.hexdigest()
def get_file_info(filename):
if filename.endswith(('.cfg', '.startup', '.confg')):
with open(filename, "r+") as in_file:
#filename = re.sub(REMOVE_RE, subst, filename, 0, re.MULTILINE)
return get_file_info_from_lines(filename, in_file.readlines())
def hostname_parse(directory):
results = {}
i = 0
l = len(os.listdir(directory))
for filename in os.listdir(directory):
filename = os.path.join(directory, filename)
sleep(0.001)
i += 1
progress_bar(i, l, prefix = 'Progress:', suffix = 'Complete', barLength = 50)
info = get_file_info(filename)
if info is not None:
results[info[0]] = info
return results
这是查找要删除的字符串的正则表达式。
REMOVE_RE = r"((?:\bCurrent configuration)(?:.*\n?){6})"
subst = ""
EXAMPLE_FILE_BEFORE_DATA_REMOVED：
Building configuration...
Current configuration : 45617 bytes
!
! Last configuration change at 00:22:36 UTC Sun Jan 22 2017 by user
! NVRAM config last updated at 00:22:43 UTC Sun Jan 22 2017 by user
!
version 15.0
no service pad
!
no logging console
enable secret 5 ***encrypted password***
!
username admin privilege 15 password 7 ***encrypted password***
username sadmin privilege 15 secret 5 ***encrypted password***
aaa new-model
!
ip ftp username ***encrypted password***
ip ftp password 7 ***encrypted password***
ip ssh version 2
!
line con 0
password 7 ***encrypted password***
login authentication maint
line vty 0 4
password 7 ***encrypted password***
length 0
transport input ssh
line vty 5 15
password 7 ***encrypted password***
transport input ssh
!
EXAMPLE_FILE_AFTER_DATA_REMOVED：
Building configuration...
!
no service pad
!
no logging console
enable
!
username admin privilege 15
username gisadmin privilege 15
aaa new-model
!
ip ftp username cfgftp
ip ftp
ip ssh version 2
!
line con 0
login authentication maint
line vty 0 4
length 0
transport input ssh
line vty 5 15
transport input ssh
!
我尝试在 get_file_info 和 get_file_info_from_lines 中执行类似 #filename = re.sub(REMOVE_RE, subst, filename, 0, re.MULTILINE) 的操作，但显然我没有正确实现。
如果我刚刚学习，任何帮助将不胜感激。
运行比较：
results1 = hostname_parse('test1.txt')
results2 = hostname_parse('test2.txt')
for hostname, filename, filehash in results1.values():
if hostname in results2:
_, filename2, filehash2 = results2[hostname]
if filehash != filehash2:
print("%s has a change (%s, %s)" % (
hostname, filehash, filehash2))
print(filename)
print(filename2)
print()
我不想修改当前文件。如果所有这些都可以在内存中完成，或者一个临时文件会很棒。
完整代码：
import hashlib
import os
import re
HOSTNAME_RE = re.compile(r'hostname +(\S+)')
REMOVE_RE = re.compile(r"((?:\bCurrent configuration)(?:.*\n?){6})")
def get_file_info_from_lines(filename, file_lines):
hostname = None
a_hash = hashlib.sha1()
for line in file_lines:
#match = HOSTNAME_RE.match(line)
if not re.match(REMOVE_RE, line):
a_hash.update(line.encode('utf-8'))
#=======================================================================
# if match:
# hostname = match.group(1)
#=======================================================================
return hostname, filename, a_hash.hexdigest()
def get_file_info(filename):
if filename.endswith(('.cfg', '.startup', '.confg')):
with open(filename, "r+") as in_file:
return get_file_info_from_lines(filename, in_file.readlines())
def hostname_parse(directory):
results = {}
for filename in os.listdir(directory):
filename = os.path.join(directory, filename)
info = get_file_info(filename)
if info is not None:
results[info[0]] = info
return results
results1 = hostname_parse('test1') #Directory of test files
results2 = hostname_parse('test2') #Directory of test files 2
for hostname, filename, filehash in results1.values():
if hostname in results2:
_, filename2, filehash2 = results2[hostname]
if filehash != filehash2:
print("%s has a change (%s, %s)" % (
hostname, filehash, filehash2))
print(filename)
print(filename2)
print()
【问题讨论】：
-
有什么帮助吗？我仍然无法让它正常工作。
-
能否请您添加完整代码 - 以便我们知道这里使用了哪些库？无法让您的代码正常工作！对不起
-
@Md.SifatulIslam 完成。
-
你能验证两个文件之间的差异只有那一行吗？ “差异文件 1 文件 2”
-
@velotron 是的，文件是相同的副本，除了我为验证文本块实际上被忽略而修改的部分。
标签： python regex python-2.7 file-io