第3章 处理异常

2023-01-31 01:01:50 异常
代码有问题时，python会显示traceback，后面跟着一条错误信息。这个错误被称为异常（exception）。
 
格式
try:
    可能产生运行时错误的代码
except:
    错误恢复代码
测试文本
Man: Is this your car?
Other man: No.
Woman: What color is it?
Bye.
Go on
增加额外的代码处理错误
#!/usr/local/Python
with open('E:/python code/other/tmp/test.txt') as fd:
    for each_line in fd:
        if each_line.find(':') > 0:
            (role, line_spoken) = each_line.split(':',1)
            print(role),
            print(' said '),
            print(line_spoken),
使用try-except处理错误
#!/usr/local/python
import os,sys
try:
    with open('E:/python code/other/tmp/test.txt') as fd:
        for each_line in fd:
            try:
                (role, line_spoken) = each_line.split(':', 1)
                print(role),
                print(' said '),
                print(line_spoken),
            except ValueError:
                pass
except IOError:
    print('The file is missing.')



错误




sfsdfsdfdsfsd




nisdfds ffdsdsfd





恢复代码 

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