以下Python程序的说明和结果。 [英] Explanation and result of the following Python program.

问题描述

x = 5
if 8 % 4:
    x = x - 1
elif 3 < 4 / 2:
    x = x - 2
elif "t":
    x = x - 3
else:
    x = x - 4
print (x)

我尝试了什么：



我认为结果是1但是结果是2.

我不明白以下陈述的含义：

What I have tried:

I think of the result is 1 but the result is 2.
I do not understand the meaning of below statements:

elif 3 < 4 / 2:
    x = x - 2

推荐答案

Quote：

我不明白以下陈述的含义：

I do not understand the meaning of below statements:

elif 3 < 4 / 2:
    x = x - 2

这样更好吗？

Is it better like that ?

elif 3 < (4 / 2):
    x = x - 2

阅读运算符优先级以了解表达式的工作原理。



使用调试器，看看这个代码在做什么以及如何构建答案。



有一个工具可以让你看到你的代码在做什么，它的名字是< b>调试的。它也是一个很好的学习工具，因为它向你展示了现实，你可以看到哪种期望与现实相符。

当你不明白你的代码在做什么或为什么它做它做的时候，答案就是答案是调试器。

使用调试器查看代码正在执行的操作。只需设置断点并查看代码执行情况，调试器允许您逐行执行第1行并在执行时检查变量。



调试器 - 维基百科，免费的百科全书 [ ^ ]

27.3。 pdb - Python调试器 - Python 3.6.1文档 [ ^ ]

使用Python进行调试Python征服宇宙 [ ^ ]

pdb - 交互式调试器 - 本周的Python模块 [ ^ ]

调试器在这里显示你的内容代码正在做，你的任务是与它应该做的事情进行比较。

调试器中没有魔法，它没有发现错误，它只是帮助你。当代码没有达到预期的效果时，你就会接近一个错误。

Read about "operator precedence" to understand how expressions works.

Use debugger to see what this code is doing and how the answer is built.

There is a tool that allow you to see what your code is doing, its name is debugger. It is also a great learning tool because it show you reality and you can see which expectation match reality.
When you don't understand what your code is doing or why it does what it does, the answer is debugger.
Use the debugger to see what your code is doing. Just set a breakpoint and see your code performing, the debugger allow you to execute lines 1 by 1 and to inspect variables as it execute.

Debugger - Wikipedia, the free encyclopedia[^]
27.3. pdb — The Python Debugger — Python 3.6.1 documentation[^]
Debugging in Python | Python Conquers The Universe[^]
pdb – Interactive Debugger - Python Module of the Week[^]
The debugger is here to show you what your code is doing and your task is to compare with what it should do.
There is no magic in the debugger, it don't find bugs, it just help you to. When the code don't do what is expected, you are close to a bug.

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