线程在Python中如何工作，什么是常见的Python线程特定陷阱？(How do threads work in Python, and what are common Python-threading specific pitfalls?)

 整数除法总是导致一个整数; 所以： word.Length / 2返回int （它向下word.Length / 2 ）。 
 
 当你对此调用Math.Ceiling时，你传递了一个整数，但是没有 Math.Ceiling(int) 。 它有两个选择： Math.Ceiling(double)和Math.Ceiling(decimal) ，但是：它也可以使用，而且从编译器的角度来看，这两种选择都不会更好。 
 
 坦率地说，使用通用的“页数”公式可能会更简单： 
 
int pages = (items + pageSize - 1) / pageSize;
 
 在这种情况下变得简单： 
 
int upperLimit = (word.Length + 1) / 2;
 
 （请注意，通用页面计数公式也可以写成int pages = ((items - 1) / pageSize) + 1;但在这种情况下，替换固定页面大小将更困难） 

Integer division always results in an integer; so: word.Length / 2 returns int (it rounds down).
 
When you call Math.Ceiling on this, you are passing an integer, but there is not Math.Ceiling(int). It has two choices: Math.Ceiling(double) and Math.Ceiling(decimal), but: it could use either, and neither of those is better from the compiler's perspective.
 
Frankly, it might be simpler to use the general purpose "page count" formula:
 
int pages = (items + pageSize - 1) / pageSize;
 
which in this case becomes simply:
 
int upperLimit = (word.Length + 1) / 2;
 
(note that the general purpose page count formula can also be written int pages = ((items - 1) / pageSize) + 1;, although in this case it would be harder to substitute your fixed page size)