Flush output in for loop in Jupyter notebook

Question

I want to print out i in my iteration on Jupyter notebook and flush it out. After the next iteration, I'll print the next i. I tried solutions from this question and this question, however, it just print out 0123...9 without flushing the output for me. Here is my working code:

import sys
import time

for i in range(10):
    sys.stdout.write(str(i)) # or print(i, flush=True) ?
    time.sleep(0.5)
    sys.stdout.flush()

these are my setup: ipython 5.1, python 3.6. Maybe, I missed something in the previous solution?

jose_bacoy · Accepted Answer · 2017-03-31 23:01:09Z

15

#Try this:
import sys
import time

for i in range (10):  
    sys.stdout.write('\r'+str(i))
    time.sleep(0.5)

'\r' will print at the beginning of the line

answered Mar 31, 2017 at 23:01

jose_bacoy

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1 Comment

titipata Over a year ago

thanks! this solution works for me. seems like we don't really need flush output at all.

Alperen · Accepted Answer · 2020-10-04 19:30:56Z

10

The first answer is correct but you don't need sys package. You can use the end parameter of the print function. It specifies what to print at the end, and its default value is \n(newline) (docs1, docs2). Use \r(carriage return) instead.

import time

for i in range (10):  
    print(i, end="\r")
    time.sleep(0.5) # This line is to see if it's working or not

edited Oct 4, 2020 at 19:30

answered Apr 17, 2019 at 21:39

Alperen

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1 Comment

titipata Over a year ago

Thanks @Alperen! This one is actually handy!

Striped · Accepted Answer · 2020-11-07 17:11:18Z

3

Try this

for i in range (10):  
    print("\r", end=str(i))

edited Nov 7, 2020 at 17:11

Striped

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answered Nov 7, 2020 at 15:47

Илья Царенков

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Flush output in for loop in Jupyter notebook

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'\r' will print at the beginning of the line

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