<p>在python中不可能执行单行异常处理语句。我们可以编写一个函数来实现这一点。</p>
<pre><code>def safe_execute(default, exception, function, *args):
try:
return function(*args)
except exception:
return default
</code></pre>
<p>示例用法:</p>
<pre><code>from json import loads
safe_execute("Oh no, explosions occurred!", TypeError, loads, None)
# Returns "Oh no, explosions occurred!"
safe_execute("Huh?", TypeError, int, "10")
#Returns 10
</code></pre>
<p>支持多个参数</p>
<pre><code>from operator import div
safe_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.
</code></pre>
<p>错误捕获过程仍可能被中断:</p>
<pre><code>from time import sleep
safe_execute(
"Panic!",
Exception,
sleep, 8
)
# Ctrl-c will raise a KeyboardInterrupt
from sys import exit
safe_execute("Failed to exit!", Exception, exit)
# Exits the Python interpreter
</code></pre>
<p>如果此行为是不需要的,请使用<code>BaseException</code>:</p>
<pre><code>from time import sleep
safe_execute("interrupted",
BaseException,
sleep, 8)
#Pressing Ctrl-c will return "interrupted"
from sys import exit
safe_execute("Naughty little program!",
BaseException,
exit)
#Returns "Naughty little program!"
</code></pre>