标签:python自定义异常
python自定义异常
try 异常在try块里抛,如果会产生多个异常,捕捉第一个,匹配except,后边的不再捕捉
except: 抓异常
else: try无异常,才会执行else
finally: 无论try块是否抛异常,永远执行的代码,通常用来执行关闭文件,断开服务器连接的功能
[root@133 systeminformation]# vim ErrorExcept.py #!/usr/bin/env python #ecoding:utf-8 class FuncError(Exception): def __str__(self): return "I am func Error" def fun(): raise FuncError() #raise 抛出异常"I am func Error" try: fun() except FuncError,e: print e print ‘hello world‘ [root@133 systeminformation]# python ErrorExcept.py I am func Error hello world
#!/usr/bin/env python #ecoding:utf-8 class FuncError(Exception): def __str__(self): return "I am func Error" def fun(): raise FuncError() #raise 抛出异常"I am func Error" try: #fun() print ‘a‘ #print ‘a‘正确显示结果,如果是print a,报错name error,打印!! except FuncError,e: #如果print a 和fun()同时存在,print a在前,会打印!!,不打印I am fun error, fun()在前,打印I am fun error,不打印!! print e except NameError: print ‘!!‘ else: #不抛异常,输出a,这种情况下执行else内容 print ‘else‘ finally: #finally无论如何都执行 print ‘finally‘ print ‘hello world‘ #print一定会执行 [root@133 systeminformation]# python ErrorExcept.py a else finally hello world #!/usr/bin/env python #ecoding:utf-8 class FuncError(Exception): def __str__(self): return "I am func Error" def fun(): raise FuncError() #raise 抛出异常"I am func Error" try: fun() #即使有两个异常,抛出一个异常I am func Error,不再抛出第二个 print a except Exception: #匹配所有异常,匹配即结束,打印all exception print ‘all exception‘ except FuncError,e: print e except NameError: print ‘!!‘ else: #没有异常菜执行else,有异常不执行 print ‘else‘ finally: print ‘finally‘ print ‘hello world‘ [root@133 systeminformation]# python ErrorExcept.py all exception finally hello world
glob:python下类似shell中的*的通配符
In [1]: import glob In [2]: glob.glob(‘/etc/*.conf‘) #匹配/etc下*.conf文件,保存到list中 Out[2]: [‘/etc/rsyslog.conf‘, ‘/etc/sensors3.conf‘, ‘/etc/GeoIP.conf‘, ‘/etc/Trolltech.conf‘, ‘/etc/nfsmount.conf‘,
shlex :分词模块,
[root@133 ~]# ps -eo pid,ppid,cmd PID PPID CMD 1 0 /sbin/init 2 0 [kthreadd] 3 2 [migration/0] 4 2 [ksoftirqd/0] [root@133 ~]# ipython In [1]: import shlex In [2]: cmd = "ps -eo pid,ppid,cmd" In [3]: shlex.split(cmd) #返回列表元素 Out[3]: [‘ps‘, ‘-eo‘, ‘pid,ppid,cmd‘] In [4]: import subprocess In [5]: subprocess.check_call(shlex.split(cmd)) PID PPID CMD 1 0 /sbin/init 2 0 [kthreadd] 3 2 [migration/0]
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标签:python自定义异常
原文地址:http://daixuan.blog.51cto.com/5426657/1880468