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Python provides a generator to create your own iterator function. A generator is a special type of function which does not return a single value, instead, it returns an iterator object with a sequence of values. In a generator function, a yield statement is used rather than a return statement.
The short answer is that a generator expression cannot be printed because its values don't exist; they're generated on demand. What you can do (assuming the generator stops sometime) is get all the values out of it, like with list() , and then print them.
Yes, generator can be used only once.
What Is Yield In Python? The Yield keyword in Python is similar to a return statement used for returning values or objects in Python. However, there is a slight difference. The yield statement returns a generator object to the one who calls the function which contains yield, instead of simply returning a value.
Yes, or next(gen) in 2.6+.
In Python <= 2.5, use gen.next(). This will work for all Python 2.x versions, but not Python 3.x
In Python >= 2.6, use next(gen). This is a built in function, and is clearer. It will also work in Python 3.
Both of these end up calling a specially named function, next(), which can be overridden by subclassing. In Python 3, however, this function has been renamed to __next__(), to be consistent with other special functions.
Use (for python 3)
next(generator)
Here is an example
def fun(x):
n = 0
while n < x:
yield n
n += 1
z = fun(10)
next(z)
next(z)
should print
0
1
This is the correct way to do it.
You can also use next(gen).
http://docs.python.org/library/functions.html#next
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