Python implements backup file instances
- 2020-04-02 14:03:56
- OfStack
This article illustrates how Python implements backup files, which is a very useful technique. Share with you for your reference. Specific methods are as follows:
This instance mainly realizes reads a task file, according to the specified task parameter automatic backup.
Task file format: (note that comments after semicolons are not supported)
[task] ; A mission begins
dir=h:/Project ; Specify the directory to backup
recusive=1 ; Whether recursive subdirectories
suffix=h|cpp|hpp|c|user|filters|vcxproj|sln|css|gif|html|bmp|png|lib|dsw|dsp|htm|html|ico|ini|jpg|rc|vssscc ; Specifies the extension for the backup
exclude=0 ; Specifies whether to back up the extension specified by the above argument or to exclude the specified extension
zip=Project.zip ; File path name after backup
The python code is as follows:
# -*- coding: utf-8 -*-
import sys
import os
import zipfile
class Task:
#dir str directory
#bsub BOOL include subdirectory
#sfx str postsuffix ,sepeated by '|'
#ecld BOOL include or execlude the postsuffix sfx
def __init__(self,dir,bsub,sfx,ecld,zip):
self.dir = dir
self.bsub = bsub
self.suffix = sfx.split("|")
self.exclude = ecld
self.zip = zip
@staticmethod
def isfilter(sfx,sfxs,bexcld):
bFound = False
for e in sfxs:
if e == sfx:
bFound = True
break
if bexcld:
return not bFound;
else:
return bFound;
class QBackup:
''' Backup files with the specified extension in the specified directory '''
def __init__(self):
self._list = []
def __del__(self):
pass
#tfile Task file
def ReadTask(self,tfile):
dir = ""
bsub = False
sfx = ""
becld = False
zip = ""
try:
f = open(tfile,'r')
while True:
line = f.readline()
if len(line) == 0:
break;
line = line.strip(" ")
if "[Task]/n".lower() == line.lower():
# Read the following 4 line
iline = 1
while iline <= 5:
line = f.readline()
line = line.strip(" /t/n") # Before and after whitespace is removed
idx = line.find("=")
if -1 == idx:
break;
atti = line[0:idx]
value = line[idx+1:]
print(value)
if "dir" == atti:
dir = value
elif "recusive" == atti:
bsub = bool(int(value))
elif "suffix" == atti:
sufix = value
elif "exclude" == atti:
becld = bool(int(value))
elif "zip" == atti:
zip = value
else:
break
iline += 1
else:
t = Task(dir,bsub,sufix,becld,zip)
self._list.append(t)
except:
return False
return True
def DoBackup(self):
for e in self._list:
try:
zip = zipfile.ZipFile(e.zip,'w',zipfile.ZIP_DEFLATED)
self.ZipDir(zip,e.dir,e.bsub,e.suffix,e.exclude)
zip.close()
except:
print("exception raised!")
return False
return True
def ZipDir(self,zip,dir,bsub,sfxs,ecld):
subdir = ""
path = ""
if os.path.isdir(dir):
paths = os.listdir(dir)
# Backup this directory
print("ZipDir: ",dir)
for e in paths:
path = dir + "/" + e
ext = os.path.splitext(e)[1][1:]
if os.path.isfile(path) and Task.isfilter(ext,sfxs,ecld):
print ("ZipFile: ",path)
zip.write(path)
# Clean up subdirectories
if bsub:
for e in paths:
subdir = dir + "/" + e
self.ZipDir(zip,subdir,bsub,sfxs,ecld)
def PrintTask(self):
for e in self._list:
print (e.dir,e.bsub,e.suffix,e.exclude,e.zip)
if '__main__' == __name__:
c = QBackup()
c.ReadTask("bkup.txt")
c.DoBackup()
I hope that this article has helped you to learn Python programming.