Question

Hey, can someone explain to me what a python generator is and how to use it?I need to know it to solve a problem.Thanks

Answer 1

refer
http://wiki.python.org/moin/Generators

Answer 2

http://docs.python.org/2.7/howto/functional.html#generators
http://docs.python.org/2.7/reference/simple_stmts.html#the-yield-statement
http://docs.python.org/2.7/library/stdtypes.html#generator-types
http://docs.python.org/2.7/reference/expressions.html#yield-expressions
http://docs.python.org/2.7/howto/functional.html#generator-expressions-and-list-comprehensions

Answer 3

Here's a fibonacci generator.

def fib(n):
a,b = 0,1
for _ in xrange(n):
yield b
a,b = b, a+b

And a test

print fib(10)
print list(fib(10))
for i in fib(10):
print i,

And the output

<generator object fib at 0x0298F490>
[1, 1, 2, 3, 5, 8, 13, 21, 34, 55]
1 1 2 3 5 8 13 21 34 55