我會為此編寫一個快速包裝函數(shù)first()。

用法：value = first([f1, f2, f3, ..., fn], default='All failed')#!/usr/bin/env

def first(flist, default=None):

""" Try each function in `flist` until one does not throw an exception, and

return the return value of that function. If all functions throw exceptions,

return `default`

Args:

flist - list of functions to try

default - value to return if all functions fail

Returns:

return value of first function that does not throw exception, or

`default` if all throw exceptions.

TODO: Also accept a list of (f, (exceptions)) tuples, where f is the

function as above and (exceptions) is a tuple of exceptions that f should

expect. This allows you to still re-raise unexpected exceptions.

"""

for f in flist:

try:

return f()

except:

continue

else:

return default

# Testing.

def f():

raise TypeError

def g():

raise IndexError

def h():

return 1

# We skip two exception-throwing functions and return value of the last.

assert first([f, g, h]) == 1

assert first([f, g, f], default='monty') == 'monty'

總結

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