#!/usr/bin/python # Filename: try_except.py import sys try: s = raw_input('Enter something --> ') except EOFError:#处理EOFError类型的异常 print '/nWhy did you do an EOF on me?' sys.exit() # 退出程序 except:#处理其它的异常 print '/nSome error/exception occurred.' print 'Done...
当try语句的任何其他子句通过break,continue或return语句离开时,最后也会在“离开之前”被执行,参考下面这个更复杂的例子: 代码语言:javascript 复制 In[13]:defdivide(a,b):...:try:...:result=a/b...:except ZeroDivisionError:...:print('divided by zero!')...:else:...:print('result is',result)...
Python3的关键字有:and, as, assert, break, class, continue, def, del, elif,else, except, False, finally, for, from, global, if, import, in, is, lambda,None, nonlocal, not, or, pass, raise, return, True, try, while, with, yield 5)错在 ++ 或者 -- 自增自减操作符。(导致“Sy...
异常类通常应该直接或间接的从Exception类派生,例如: >>>classMyError(Exception):...def__init__(self,value):...self.value=value...def__str__(self):...returnrepr(self.value)...>>>try:...raiseMyError(2*2)...exceptMyErrorase:...print('My exception occurred, value:',e.value)...My...
print('It was not a number. Try again.') finally: print('Some clean-up actions!') 与else 从句的区别在于: else 语句只在没有异常发生的情况下执行,而 finally 语句则不管异常发生与否都会执行。准确的说,finally 语句总是在退出 try 语句前被执行,无论是正常退出、异常退出,还是通过break、continue、re...
try: example_function(-5) except CustomException as e: print("捕获到自定义异常：", e...
print(char) 输出: H e l l o while 循环 while循环用于在条件为真时重复执行代码块。 示例1:基本while循环 python count = 0 while count < 5: print(count) count += 1 输出: 0 1 2 3 4 示例2:使用break和continue break用于提前退出循环。
def fetcher(obj, index): return obj[index] x = 'spam' try: fetcher(x,9) except IndexError: print('got exception') print('continue...') got exception continue... 在这个例子中,我们在异常捕捉和处理后,程序在捕捉了整个try语句后继续执行;这就是我们之所以得到continue消息的原因。我们没有看见标...
print(inst.args) print(inst) <class 'Exception'> ('spam', 'eggs') ('spam', 'eggs') 抛出异常: raise语句允许程序员强制抛出一个指定的异常: >>> raise NameError('Hi There') Traceback (most recent call last): File "<pyshell#39>", line 1, in <module> ...
2 print(10/0) 3 except Exception as e: ---> 4 raise RuntimeError("something is wrong") from e 5 RuntimeError: something is wrong 如果异常一个在except[主语]或finally[主语]中被抛出,类似的机制会隐式地发挥作用,的之前将异常关联被新到异常的__context__属性例如: In...