Alan Gauld wrote:
> On 08/01/12 23:34, Adam Gold wrote:
>>
>> I have short piece of code I'm using to print a string to
> > the terminal one letter at a time. It works fine when
>> I invoke the script from within Idle; each letter appears
>> afterthe preceding one according to the designated time
> > interval.
> > However if I run it in the Mac terminal
> > ('python3 ./script.py'),
> > there's a pause and then the whole string prints in one go.
>
> Thats because you are writing to stdout rather than using print
> The output is buffered and the terminal prints the output after the
> bufrfer is flushed, which happens at the end of the program
> (probably when the file object is auto closed). if you use print
> that shouldn't happen.
>
> The alternative is to explicitly flush() the file after each write.
>
>> import sys
>> import time
>>
>> text = "this text is printing one letter at a time..."
>> for char in text:
>> sys.stdout.write(char)
>
> either use
> print char, # comma suppresses \n
The newline will be suppressed, but the next print statement will inject a
space before dumping its arguments. Also, you still need to flush(). That
makes a working print-based solution a bit esoteric:
for c in text:
print c,
sys.stdout.softspace = False
sys.stdout.flush()
time.sleep(.3)
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