I'm coding my university assignment that is somewhat connected with distributions and random roll stuff. So the question is: how to get a random number with a given discrete distribution in Ruby.
To be more specific: in trivial example with normal discrete distribution like (0 with P=1/2; 1000 with P=1/2) I could write such a function:
def chooseNumber(a,b)
rval = Random.rand(0..1)
return a if rval == 0
return b
end
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First question: is there any way to write it using …
我需要实现一个atexitPython 函数来获取最后一个错误对象并检查它的类型。如果 python 错误的类型对应于 PHP,E_ERROR我应该将错误的输出保存到文件中。
我正在移植的 PHP 代码如下所示:
register_shutdown_function( "fatal_handler" );
function fatal_handler() {
$error = error_get_last();
if ($error != null && $error['type'] === E_ERROR)
echo "recordFatalError: {$error['message']}\n";
}
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我的代码快照如下:
def fatal_handler():
# How to get last error object?
atexit.register(fatal_handler)
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如果有人向我解释如何使用 python 获得必要的功能,我会很高兴。
我必须用begin- rescue-end块包围所有东西。我写的代码看起来像:
begin
bet = Dialogs.enter_your_bet
approx.calculate_average_profit(bet)
approx.print_profits_table
retry if Dialogs.play_again?
rescue;retry
end
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该行retry if Dialogs.play_again?导致以下错误:
./main:14: Invalid retry
./main: compile error (SyntaxError)
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是否可以在没有常规多行方法的情况下使这种内联与retry子句一起if使用?ifend
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