Possible Duplicate:
The Python yield keyword explained

Can someone explain to me what the yield statement actually does in this bit of code here:

 def fibonacci():
     a, b = 0, 1
     while True:
         yield a
         a, b = b, a+b

for number in fibonacci(): # Use the generator as an iterator; print number

What I understand so far is, we are defining a function finonacci(), with no parameters? inside the function we are defining a and b equal to 0 and 1, next, while this is true, we are yielding a. What is this actually doing? Furthermore, while yielding a? a is now equal to b, while b is now equal to a + b.

Next question, for number in fibonacci(), does this mean for every number in the function or what? I'm equally stumped on what yield and 'for number' are actually doing. Obviously I am aware that it means for every number in fibonacci() print number. Am I actually defining number without knowing it?

Thanks, sorry if I'm not clear. BTW, it's for project Euler, if I knew how to program well this would be a breeze but I'm trying to learn this on the fly.

Possible Duplicate:
The Python yield keyword explained

Can someone explain to me what the yield statement actually does in this bit of code here:

 def fibonacci():
     a, b = 0, 1
     while True:
         yield a
         a, b = b, a+b

for number in fibonacci(): # Use the generator as an iterator; print number

What I understand so far is, we are defining a function finonacci(), with no parameters? inside the function we are defining a and b equal to 0 and 1, next, while this is true, we are yielding a. What is this actually doing? Furthermore, while yielding a? a is now equal to b, while b is now equal to a + b.

Next question, for number in fibonacci(), does this mean for every number in the function or what? I'm equally stumped on what yield and 'for number' are actually doing. Obviously I am aware that it means for every number in fibonacci() print number. Am I actually defining number without knowing it?

Thanks, sorry if I'm not clear. BTW, it's for project Euler, if I knew how to program well this would be a breeze but I'm trying to learn this on the fly.

Possible Duplicate:
The Python yield keyword explained

Can someone explain to me what does the yield statement do in this bit of code here

 def fibonacci():
     a, b = 0, 1
     while True:
         yield a
         a, b = b, a+b

for number in fibonacci(): # Use the generator as an iterator; print number

What I understand so far is, we are defining a function finonacci(), with no parameters? inside the function we are defining a and b equal to 0 and 1, next, while this is true, we are yielding a. What is this actually doing? Furthermore, while yielding a? a is now equal to b, while b is now equal to a + b.

Next question, for number in fibonacci(), does this mean for every number in the function or what? I'm equally stumped on what yield and 'for number' are actually doing. Obviously I am aware that it means for every number in fibonacci() print number. Am I actually defining number without knowing it?

Thanks, sorry if I'm not clear. BTW, it's for project Euler, if I knew how to program well this would be a breeze but I'm trying to learn this on the fly.

Possible Duplicate:
The Python yield keyword explained

Can someone explain to me what the yield statement actually does in this bit of code here:

 def fibonacci():
     a, b = 0, 1
     while True:
         yield a
         a, b = b, a+b

for number in fibonacci(): # Use the generator as an iterator; print number

What I understand so far is, we are defining a function finonacci(), with no parameters? inside the function we are defining a and b equal to 0 and 1, next, while this is true, we are yielding a. What is this actually doing? Furthermore, while yielding a? a is now equal to b, while b is now equal to a + b.

Next question, for number in fibonacci(), does this mean for every number in the function or what? I'm equally stumped on what yield and 'for number' are actually doing. Obviously I am aware that it means for every number in fibonacci() print number. Am I actually defining number without knowing it?

Thanks, sorry if I'm not clear. BTW, it's for project Euler, if I knew how to program well this would be a breeze but I'm trying to learn this on the fly.