Make Ipython Notebook Print In Real Time

Ipython Notebook doesn't seem to print results in real time, but seems to buffer in a certain way and then bulk output the prints. How can I make ipython print my results as soon a

Solution 1:

This is merely one of the answers to the question suggested by Carsten incorporating the __getattr__ delegation suggested by diedthreetimes in a comment:

import sys
oldsysstdout = sys.stdout
classflushfile():
    def__init__(self, f):
        self.f = f
    def__getattr__(self,name): 
        returnobject.__getattribute__(self.f, name)
    defwrite(self, x):
        self.f.write(x)
        self.f.flush()
    defflush(self):
        self.f.flush()
sys.stdout = flushfile(sys.stdout)

In the original answer, the __getattr__ method is not implemented. Without that, it fails. Other variants in answers to that question also fail in a notebook.

In a notebook, sys.stdout is an instance of IPython.kernel.zmq.iostream.OutStream and has a number of methods and attributes not present in the usual sys.stdout. Delegating __getattr__ allows a flushfile to masquerade as a ...zmq.iostream.OutStream duck.

This works in a python 2.7 notebook run with ipython 3.1.0

Solution 2:

Since Python 3.3, print() has an additional flush argument that can be used to force flushing:

for i in range(10):
    print(i, flush=True)
    time.sleep(1)  

Solution 3:

Try this:

from IPython.display import display, clear_output

display("Hello World") # print string
display(df) # print object such as dataframe

clear_output(wait=True) # use this if need to clear the output before display, good for dynamic updates

Solution 4:

Additionally, you can use the carriage return character:

fromtime import sleep
for i in range(10):
    print(i, end='\r')
    sleep(1)

Or if you're using Jupyter Notebooks:

from IPython.display import clear_output
fromtime import sleep
for i in range(10):
    print(i)
    sleep(1)
    clear_output(wait=True)