[python3]
Greetings! Please forgive me if im posting this to the wrong group. I'm new to Python, learning Python3 from the O'rielly "Learning Python" book. Reading about operator overloading, specifically __getitem__. I put together a small bit of code to do some experimenting and threw in a timer so i can see it do its thing. For some reason the time.sleep(x) function doesnt work when my print function includes "end=''". Thanks in advance for any help. ---code--- class TestClass(): def __init__(self): self.data = "I was far from home and the spell of the eastern sea was upon me." def __getitem__(self,i): return self.data[i] import time if __name__ == "__main__": me = TestClass() for x in me: print(x,end='') #if i remove the 'end=''' it performs as i'd expect time.sleep(int(2)) -- http://mail.python.org/mailman/listinfo/python-list
Re: [python3]
On Mar 19, 2:21 pm, Terry Reedy wrote: > On 3/19/2010 1:42 PM, Kevin Adams wrote: > > > Please forgive me if im posting this to the wrong group. > > Just the right place. I would suggest a more informative title in the > future though. 'Problem with print and sleep.', for instance. > > > > > I'm new to Python, learning Python3 from the O'rielly "Learning > > Python" book. Reading > > about operator overloading, specifically __getitem__. I put together > > a small bit of code to > > do some experimenting and threw in a timer so i can see it do its > > thing. > > Good idea. Welcome to Python. > > > For some reason > > the time.sleep(x) function doesnt work when my print function includes > > "end=''". > > I cut your code, pasted it into IDLE edit window, and made two minor > modifications. For me (3.1, winxp) it works perfectly either way -- > chars print at 1 sec intervals either vertically or horizonatally. So I > am not sure what you are claiming. > > > > > Thanks in advance for any help. > > > ---code--- > > > class TestClass(): > > def __init__(self): > > self.data = "I was far from home and the spell of the eastern > > sea was upon me." > > I shortened string > > > > > def __getitem__(self,i): > > return self.data[i] > > > import time > > > if __name__ == "__main__": > > > me = TestClass() > > for x in me: > > print(x,end='') #if i remove the 'end=''' it performs as i'd > > expect > > time.sleep(int(2)) > > int(2) == 2, so delete irrelevant call, and 1 sec is enough > > Terry Jan Reedy Thanks to all!!! It did indeed turn out to be a need to flush the stdout. K ps. sorry for the brief subject, i wasnt finish and hit send before comming back to it. -- http://mail.python.org/mailman/listinfo/python-list
Re: [python3]
On Mar 19, 3:02 pm, Terry Reedy wrote: > On 3/19/2010 2:17 PM, Steve Holden wrote: > > > > > Kevin Adams wrote: > >> Greetings! > > >> Please forgive me if im posting this to the wrong group. > > >> I'm new to Python, learning Python3 from the O'rielly "Learning > >> Python" book. Reading > >> about operator overloading, specifically __getitem__. I put together > >> a small bit of code to > >> do some experimenting and threw in a timer so i can see it do its > >> thing. For some reason > >> the time.sleep(x) function doesnt work when my print function includes > >> "end=''". > > >> Thanks in advance for any help. > > > Try the following changes: > > >> ---code--- > > >> class TestClass(): > >> def __init__(self): > >> self.data = "I was far from home and the spell of the eastern > >> sea was upon me." > > >> def __getitem__(self,i): > >> return self.data[i] > > >> import time > > > import sys > > >> if __name__ == "__main__": > > >> me = TestClass() > >> for x in me: > >> print(x,end='') #if i remove the 'end=''' it performs as i'd > >> expect > > sys.stdout.flush() > > >> time.sleep(int(2)) > > > It may just be that the output is being held in buffers until the > > program terminates. the fluch() methof pushes it straight out. > > The IDLE Shell window must get print output back from the pythonw > process without buffering. When I cut and pasted from IDLE editor to > standard interpreter window, output was bunched after several seconds. > OP should have started with short string and minimal delay so output > would not take a whole minute. Flushing fixed problem in standard > interpreter. I will have to remember that testing partial line output in > IDLE does not show how it will act elsewhere. > > Kevin: when reporting a problem, be more specific as to what 'does not > work' means. > > Terry Jan Reedy Terry: Will definately try to be more informative next time. Thanks again. K -- http://mail.python.org/mailman/listinfo/python-list
