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| #!/usr/bin/env python | |
| #-*- coding: utf-8 -*- | |
| from __future__ import print_function | |
| from time import sleep | |
| string = "The words in this sentence should appear letter by letter." | |
| print("Please wait if you don't see another sentence appearing below.", end="\n\n") | |
| for characters in string: | |
| # If flush disabled the another line will appear at once and not char by char. | |
| print(characters, end="", flush=True) | |
| sleep(.1) |
please explain
If you remove flush, it should print the sentence all at once.
Something must be wrong with your setup. That is the normal behavior I told before.
I came here through your question about this matter on Stack Overflow and it seems like DeepakMishraDA is right. Flush does not have to do anything in this code. The letters appear one by one because of for loop and sleep in the end. Switching flush to False does the exactly same thing.
I think generally it will be hard to see what flush does unless you have a huge string to print. Human eye can't really differentiate the times it takes for printing between such short string and part of it.
No difference with or without flush.
Python 3.9
Windows 10 Pro
@shy-tan @Gwanza I tested it on powershell and it works fine, but I was using Jupyter before and it wasn't working on Jupyter.
I tried the same on Pycharm it doesn't work, maybe Pycharm doesn't support flush. It only works when you use it on the terminal. Try running the same file through the terminal
No difference with or without flush. Python 3.9 Windows 10 Pro
I agree with this
No, it works as intended. let me explain, all the values passed into print function are buffered until a new line is printed and then the text is flushed to the stream (opened file) or stdout (console).
if there is no new line added after every print function call which can be acheived by adding the optional argument end="" then the text is buffered. by default the value of end is \n
so only way to push the characters to stdout is to flush forcibly which is acheived via flush=True argument
and if flush=False, then you are buffering all the characters and only after the final sleep time the entire text is printed on console
Screen.Recording.2025-12-04.at.10.59.48.AM.mov
I post a comment two years ago and now I get an email from github about this gist. Also that this gist was here in 2013.
Sir, flush is not doing anything at all, the sleep func is at work