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# here is a simple generator
# a 'yield' returns an expression which then gets invoked in for loop, a num by itself is an expression
def gen1():
yield 1
yield 2
yield 3 # at this point python's list implemention will raise StopIteration since were at last yield
a = [i for i in gen1()]
print(a)
# following example depicts how Comprehensions are syntactically almost the same except the use of () instead of []
gen2 = ("{0} is even".format(i) for i in range(0, 10) if i % 2 == 0)
print(gen2.__next__()) # get a value
print(list(gen2)) # loop till the end
#print(gen2.__next__()) # this would error, generator can only be looped once
# output
#
# 0 is even
# ['2 is even', '4 is even', '6 is even', '8 is even']
# here is a Generator version of string reversal from interator.py
def reverseString2(data):
for index in range(len(data) - 1, -1, -1):
yield data[index]
for c in reverseString2('barfoo'):
print(c)
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