题
程序是这样的:
HEADER CODE
urllib2.initialization()
try:
while True:
urllib2.read(somebytes)
urllib2.read(somebytes)
urllib2.read(somebytes)
...
except Exception, e:
print e
FOOTER CODE
我的问题是何时发生错误(超时,连接由同行重置等),如何从urllib2.initialization()而不是现有的主程序重新启动,并再次从HEADER CODE重新启动?
解决方案
尝试限制的简单方法
HEADER CODE
attempts = 5
for attempt in xrange(attempts):
urllib2.initialization()
try:
while True:
urllib2.read(somebytes)
urllib2.read(somebytes)
urllib2.read(somebytes)
...
except Exception, e:
print e
else:
break
FOOTER CODE
其他提示
您可以将代码包装在“未完成”中。循环:
#!/usr/bin/env python
HEADER CODE
done=False
while not done:
try:
urllib2.initialization()
while True:
# I assume you have code to break out of this loop
urllib2.read(somebytes)
urllib2.read(somebytes)
urllib2.read(somebytes)
...
except Exception, e: # Try to be more specific about the execeptions
# you wish to catch here
print e
else:
# This block is only executed if the try-block executes without
# raising an exception
done=True
FOOTER CODE
如何将它包装在另一个循环中?
HEADER CODE
restart = True
while restart == True:
urllib2.initialization()
try:
while True:
restart = False
urllib2.read(somebytes)
urllib2.read(somebytes)
urllib2.read(somebytes)
...
except Exception, e:
restart = True
print e
FOOTER CODE
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