为什么这是以下代码的输出？

Question

我无法理解为什么此代码的输出为 16。如果我的格式有误，我深表歉意，我是编码新手。

我已经写了几次代码以确保我的格式正确

x = 1

while x < 10:

    x += x

print(x)

为我打印的输出是 16。

Answer 1

对于我，这说得通。该语句x += x相当于x *= 2，加倍x。为了帮助您理解，请x在每次迭代后尝试打印：x = 1while x < 10:&nbsp; &nbsp; x += x&nbsp; &nbsp; print(x)输出：24816在每一步：2&nbsp; &nbsp; # greater than 10? no4&nbsp; &nbsp; # greater than 10? no8&nbsp; &nbsp; # greater than 10? no16&nbsp; &nbsp;# greater than 10? yes, stop loop

Answer 2

也许更改 的位置print(x)可以帮助您：x = 1print(1)while x < 10:&nbsp; &nbsp; x += x&nbsp; &nbsp; print(x)输出：124816如您所见，有一个共同的赞助人。每次迭代都会while复制之前的值x（这是由于x += x，可以解释为 x 的两倍）。那么，条件while x < 10就很简单了。1&nbsp; &nbsp; &nbsp;# Less than 10. Keep looping.2&nbsp; &nbsp; &nbsp;# Less than 10. Keep looping.4&nbsp; &nbsp; &nbsp;# Less than 10. Keep looping.8&nbsp; &nbsp; &nbsp;# Less than 10. Keep looping.16&nbsp; &nbsp; # Greater than 10. STOP!