command.py · mirrors_nap/python-patterns

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python-patterns

command.py

command.py 1.30 KB

#!/usr/bin/env python
# -*- coding: utf-8 -*-

import os
from os.path import lexists

class MoveFileCommand(object):

def __init__(self, src, dest):
 self.src = src
 self.dest = dest

def execute(self):
 self.rename(self.src, self.dest)

def undo(self):
 self.rename(self.dest, self.src)

def rename(self, src, dest):
 print('renaming {} to {}'.format(src, dest))
 os.rename(src, dest)

def main():
 command_stack = []

# commands are just pushed into the command stack
 command_stack.append(MoveFileCommand('foo.txt', 'bar.txt'))
 command_stack.append(MoveFileCommand('bar.txt', 'baz.txt'))

# verify that none of the target files exist
 assert(not lexists("foo.txt"))
 assert(not lexists("bar.txt"))
 assert(not lexists("baz.txt"))
 try:
 with open("foo.txt", "w"): # Creating the file
 pass

# they can be executed later on
 for cmd in command_stack:
 cmd.execute()

# and can also be undone at will
 for cmd in reversed(command_stack):
 cmd.undo()
 finally:
 os.unlink("foo.txt")

if __name__ == "__main__":
 main()

### OUTPUT ###
# renaming foo.txt to bar.txt
# renaming bar.txt to baz.txt
# renaming baz.txt to bar.txt
# renaming bar.txt to foo.txt

一键复制编辑原始数据按行查看历史

Yaroslav Halchenko 提交于 2016年05月18日 02:19 +08:00 . BF/ENH: assure that foo.txt exists and no conflicts for demonstration

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56

#!/usr/bin/env python
# -*- coding: utf-8 -*-

import os
from os.path import lexists

class MoveFileCommand(object):

 def __init__(self, src, dest):
 self.src = src
 self.dest = dest

 def execute(self):
 self.rename(self.src, self.dest)

 def undo(self):
 self.rename(self.dest, self.src)

 def rename(self, src, dest):
 print('renaming {} to {}'.format(src, dest))
 os.rename(src, dest)


def main():
 command_stack = []

 # commands are just pushed into the command stack
 command_stack.append(MoveFileCommand('foo.txt', 'bar.txt'))
 command_stack.append(MoveFileCommand('bar.txt', 'baz.txt'))

 # verify that none of the target files exist
 assert(not lexists("foo.txt"))
 assert(not lexists("bar.txt"))
 assert(not lexists("baz.txt"))
 try:
 with open("foo.txt", "w"): # Creating the file
 pass

 # they can be executed later on
 for cmd in command_stack:
 cmd.execute()

 # and can also be undone at will
 for cmd in reversed(command_stack):
 cmd.undo()
 finally:
 os.unlink("foo.txt")

if __name__ == "__main__":
 main()

### OUTPUT ###
# renaming foo.txt to bar.txt
# renaming bar.txt to baz.txt
# renaming baz.txt to bar.txt
# renaming bar.txt to foo.txt