CODEWITHSUNDEEP
pythonpython-2.7escaping
kenny zhenbekov
kenny zhenbekov

Reputation: 1

First time posting. What exactly is this mean or what it supposed to do?

I am starting to learn programming so take it easy on me. Can you explain like I am five? Here is the code from LTPHW:

for  i  in [ "/", "-", "|", "\\",  "|" ]:
    print "%s \r" % i ,

I am getting errors that I could not understand. Is it supposed to print out

/, -, |, \\, |

What is going on here?

Upvotes: 0

Views: 48

Answers (1)

TigerhawkT3
TigerhawkT3

Reputation: 49330

Unfortunately, the problem is that that code doesn't have any visible output.

>>> for  i  in [ "/", "-", "|", "\\",  "|" ]:
...     print "%s \r" % i ,
...
>>>

The root cause is that LPTHW is terrible.

For each character in the list, this prints that character, then a space, then goes back to the beginning of the line, then prints a space. That last space after going back to the beginning of the line overwrites the written character.

Now, it looks like it's trying to do something like a spinning bar animation. You could start messing around with sys.stdout.write, but it's easiest to just move to Python 3 (LPTHW still insists on Python 2 for some reason). You should also add a call to time.sleep so you can actually see the animation. Also, you don't need to create a list of single-character strings; just use a multi-character string:

import time

for i in '/-|\\|':
    print(i, end='\r', flush=True)
    time.sleep(0.3)

Upvotes: 1

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