相关疑难解决方法(0)

try:
    something here
except:
    print('the whatever error occurred.')

如何在except:块中打印错误/异常？

是else和finally异常处理部分多余的？例如,以下两个代码段之间有什么区别吗？

try:
    foo = open("foo.txt")
except IOError:
    print("error")
else:
    print(foo.read())
finally:
    print("finished")

和

try:
    foo = open("foo.txt")
    print(foo.read())
except IOError:
    print("error")
print("finished")

更一般地说,不能将内容else总是移入try,而不能将内容finally移到try/catch块之外？如果是这样,是什么目的else和finally？它只是为了增强可读性吗？

可能重复:
else的目的,最后是异常处理

我想理解为什么声明中finally存在该条款try/except.我理解它的作用,但很明显,如果它在语言中占有一席之地,我会遗漏一些东西.具体来说,在finally字段中编写一个子句与在try/except语句之外写一个子句之间的区别是什么？

什么时候finally在try..except块中使用有意义？只是在try..except这样做之后才列出语句吗？

两者有什么区别？

try:
    result = 100 / 0
except ZeroDivisionError:
    print("division by zero!")
else:
    print("result is", result)
finally:
    print("final statement")

与

try:
    result = 100 / 0
except ZeroDivisionError:
    print("division by zero!")
else:
    print("result is", result)
print("final statement")

在此链接(https://docs.python.org/2/tutorial/errors.html#defining-clean-up-actions)下面说:

在离开try语句之前总是执行finally子句,无论是否发生了异常.

代码1:

try:
    print "Performing an action which may throw an exception."
except Exception, error:
    print "An exception was thrown!"
    print str(error)
else:
    print "Everything looks great!"
finally:
    print "Finally is called directly after executing the try statement whether an exception is thrown or not."

输出1:

Performing an action which may throw an exception.
Everything looks great!
Finally is called directly after executing the try statement whether an exception is thrown or not.

代码2:

try:
    print "Performing …