一线异常处理

在python中无法执行单行异常处理语句。一个人可以编写一个函数来做到这一点。

def safe_execute(default, exception, function, *args):    try:        return function(*args)    except exception:        return default

用法示例：

from json import loadssafe_execute("Oh no, explosions occurred!", TypeError, loads, None)# Returns "Oh no, explosions occurred!"safe_execute("Huh?", TypeError, int, "10")#Returns 10

支持多个参数

from operator import divsafe_execute(    "Divsion by zero is invalid.",    ZeroDivisionError,    div, 1, 0)# Returns "Divsion by zero is invalid."safe_execute(    "Divsion by zero is invalid.",    ZeroDivisionError,    div, 1, 1)# Returns 1.

错误捕获过程可能仍然被中断：

from time import sleepsafe_execute(    "Panic!",    Exception,    sleep, 8)# Ctrl-c will raise a KeyboardInterruptfrom sys import exitsafe_execute("Failed to exit!", Exception, exit)# Exits the Python interpreter

如果这种行为是不希望的，请使用

baseException

from time import sleepsafe_execute("interrupted",  baseException,  sleep, 8)#Pressing Ctrl-c will return "interrupted"from sys import exitsafe_execute("Naughty little program!",  baseException,  exit)#Returns "Naughty little program!"