Railfence code not printing anything Python

Question

1.00/5 (1 vote)

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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:

Python

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)

Posted 11-Jul-17 10:51am

Member 13304887

Updated 11-Jul-17 22:04pm

Patrice T

v3

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2 solutions

Solution 2

Python

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

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

Posted 11-Jul-17 22:04pm

Richard MacCutchan

Comments

Member 13304887 12-Jul-17 14:51pm

I just changed it to this:
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)

now it gives me this error:
Traceback (most recent call last):
File "C:/Users/maxwe/AppData/Local/Programs/Python/Python36-32/test2.py", line 8, in <module>
railTwo=railTwo+" "+plainText[i]
IndexError: string index out of range

Richard MacCutchan 13-Jul-17 3:20am

That code works fine for me. You need to ensure that your plainText string contains an even number of characters.

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Patrice T · Accepted Answer · 2017-07-11T12:46:00

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.