Railfence代码不能打印任何Python [英] Railfence code not printing anything Python

问题描述

我正在尝试制作一个代码，在一个类的不同行上打印所有其他字母，但没有任何内容正在打印。



我是什么尝试过：

I am trying to make a code that prints every other letter on a different line for a class, but nothing is being printed.

What I have tried:

plainText="hellomynameisbob"
railOne=""
railTwo=""
i=0
while i>=len(plainText):
  railOne=railOne+plainText[i]+" "
  i=i+1
  railTwo=railTwo+" "+plainText[i]
  i=i+1
print(railOne)
print(railTwo)

推荐答案

i=0
while i>=len(plainText):

什么都不做，因为0永远不会大于或等于字符串的长度。

Will do nothing, since 0 can never be greater than or equal to the length of the string.

看起来你的程序需要来自<$的字符c $ c> plaintext 在结束之前。

在一个长度 x 的字符串中，字符位于 0 到 x-1 。



有一个允许您查看代码正在执行的工具，其名称为调试器。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。

Looks like your program takes chars from plaintext past its end.
In a string of length x, the chars are at positions from 0 to x-1.

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.

这篇关于Railfence代码不能打印任何Python的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！