简单的代码工作，然后没有 [英] Simple code works then doesn't

问题描述

当我这样做时：

plainText =dank memes

i = 0

railOne =

railTwo =

而i< len（plainText）：

railOne + = plainText [i] +

i + = 1

railTwo + =+ plainText [i]

i + = 1

print（railOne）

print（ railTwo）

它的工作原理



但是当我改变什么，除了移除潮湿和模因之间的空间是给我错误



我尝试了什么：



但是当我改变什么时除了删除潮湿之间的空间和memes它给我错误

when I do this:
plainText="dank memes"
i=0
railOne=""
railTwo=""
while i<len(plainText):
railOne+=plainText[i]+" "
i+=1
railTwo+=" "+plainText[i]
i+=1
print(railOne)
print(railTwo)
it works

but when I change nothing except remove the space between dank and memes is give me errors

What I have tried:

but when I change nothing except remove the space between dank and memes it gives me errors

推荐答案

与 Railfence代码不能打印任何Python [ ^ ]



您尝试在字符串末尾使用字符。

您的代码将崩溃，因为循环使用字符，因此您将拥有奇数个字符2比2，但你不检查那里至少有2个剩余的字符。

你的循环必须检查至少有2个字符可用。



调试器会向你显示问题的位置和时间。



有一个工具可以让你看到你的代码在做什么，它的名字是调试的。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。

Same problem as with Railfence code not printing anything Python[^]

You try to use chars past the end of the string.
Your code will crash every tome you have an odd number of chars because the loop use chars 2 by 2 but you don't check the there at least 2 remaining chars.
your loop must check that there at least 2 chars available.

The debugger would have showed you where and when is the problem.

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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