Hi, <<Sent an email directly to you before by mistake - sorry about that - sending this to the list (tutor@python.org) directly - this way others can answer too, and correct/improve my answers.>>
On Wed, Apr 15, 2009 at 7:41 PM, mbikinyi brat <mbikinyi_b...@yahoo.com> wrote: > Dear Oxymoron, > In my previous example I had to import math for it to work . But in this > code with the factorial, I have not imported anything yet when I call it > with factorial(5), I get the result. How is this possible? In this example, you're not using anything from an external module like math, your code is self-contained, so you did not have to import anything. Earlier you called math.pi - math is a module that's part of standard Python, but still needs to be imported, it is external to your file. > Regards, > Henry > > --- On Wed, 4/15/09, Oxymoron <moron....@gmail.com> wrote: > > From: Oxymoron <moron....@gmail.com> > Subject: Re: [Tutor] colours in IDLE > To: tutor@python.org > Date: Wednesday, April 15, 2009, 5:36 AM > > Hi, > > On Wed, Apr 15, 2009 at 7:29 PM, mbikinyi brat <mbikinyi_b...@yahoo.com> > wrote: >> Dear ALL, >> When you type a code in IDLE-Python, they appear in different colours. >> For instance: >> def factorial(n): >> if n==0: >> return 1 >> else: >> recurse=factorial(n-1) >> result=n*recurse >> return result >> factorial in blue and return and else and result in red. >> Any significance to these colours? >> > > That's called "syntax-highlighting", it basically allows you to read > the code clearer. Different Python language constructs are given > appropriate colours. I don't use IDLE myself, but in your example, > 'factorial' - is a function name - an identifier in general, that's > assigned one colour, whereas 'def', 'else', 'return' are Python > keywords - you cannot use these as identifiers - they're assigned yet > another colour. Keywords, braces, operators, identifiers - these > constitute the 'syntax' of Python. Hence using colours highlights the > syntax so it's easier to read -- syntax-highlighting ;-). > _______________________________________________ > Tutor maillist - Tutor@python.org > http://mail.python.org/mailman/listinfo/tutor > > -- There is more to life than increasing its speed. -- Mahatma Gandhi _______________________________________________ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
