环境python脚本,需要使用以前运行的结果

Question

好吧,我确信可能有很多方法可以做到这一点,但我问,因为我不知道从哪里开始寻找一种方法来做到这一点.我有一个python脚本运行一些基本的bash命令,并根据输出将发送电子邮件到给定的电子邮件地址.我想这样做,只有当该信息与脚本的最后输出不同时才会发送电子邮件.

所以说我运行'lpstat -p'并发送电子邮件,因为打印机'a'被禁用,cron在一小时后再次运行脚本我只想要另外发送一封电子邮件,如果'a'以外的东西需要电子邮件通知.

我可能已经深入细节,但实际上我只想让脚本知道在以前的脚本运行中发生了什么 - 这有什么意义吗？我知道我可以在文件上运行"触摸",但这似乎相当原始,所以我想知道python是否有一个很好的内置方式来处理这个而不会过于复杂.

这是一个简短的例子,说明如果我的解释没有意义,我正在做什么.

# The string used to find disabled pritners based on the stdout of lpstat
string_check = 'disabled'
stdout = commands.getoutput( 'lpstat -p' )
lpout  = stdout.split( '\n' )
disabled = []

# Cycle through the output of lpstat which has been split into tokens based on each line of the output and save the lines that have a substring match with string_check
for line in lpout:
    if string_check in line:
        disabled.append( line )

# Initiate the required variables for constructing a basic email
new_message = ""
SERVER = ""
FROM = ""
TO = ""
SUBJECT = ""
TEXT = ""
message = ""

# Just some string manipulation - tries to remove useless, redundant information from the lpstat output
for line in disabled:
    line = line.replace( "printer ", "" )
    line = line.replace( " is ", "" )
    line = line.replace( "idle.", "\t" )
    line = line.replace( string_check, "\t" )
    new_message += "\t" + line + "\n"

SERVER = "localhost"

FROM = "email"
TO = "email"
SUBJECT = "Printer unnexpectedly disabled"
TEXT = new_message

# Email template
message = """\
From: %s
To: %s
Subject: %s

Printers that seem to be disabled:

%s
""" % ( FROM, TO, SUBJECT, TEXT )

# if there ended up being some stuff in the disabled array then send the email
if len( disabled ) > 0:
    server = smtplib.SMTP( SERVER )
    server.sendmail ( FROM, TO, message )
    server.quit( )

Answer 1

shelve模块在Python中提供了一个非常简单的持久字典.

http://docs.python.org/library/shelve.html