Strange behavior in Python 3 using the sys module

Question

While I was trying some stuffs in my Python 3 interpreter (Python 3.4.2, installed via brew), I encountered some weird outputs I didn\'t expected:

>>&g         


        

Answer 1

This behaviour is normal. This happens because sys.stdout.write() returns the length of the text. Try this code again in a python file. you see, this doesn't happen anymore. This "weird stuff" happens because python automatically prints the return value unless you execute the code using a python file.

>>>'text'
'text'

if you do this in a python file, there will be no result. you can prevent this by stopping the return such as this:

>>>_=sys.stdout.write('text')

or doing this:

>>>def noreturn(value):
...    pass
>>>noreturn(sys.stdout.write('text'))