For dictionary, I can use iter() for iterating over keys of the dictionary.
y = {"x":10, "y":20}
for val in iter(y):
print val
When I have the iterator as follows,
class Counter:
def __init__(self, low, high):
self.current = low
self.high = high
def __iter__(self):
return self
def next(self):
if self.current > self.high:
raise StopIteration
else:
self.current += 1
return self.current - 1
Why can't I use it this way
x = Counter(3,8)
for i in x:
print x
nor
x = Counter(3,8)
for i in iter(x):
print x
but this way?
for c in Counter(3, 8):
print c
What's the usage of iter() function?
ADDED
I guess this can be one of the ways of how iter() is used.
class Counter:
def __init__(self, low, high):
self.current = low
self.high = high
def __iter__(self):
return self
def next(self):
if self.current > self.high:
raise StopIteration
else:
self.current += 1
return self.current - 1
class Hello:
def __iter__(self):
return Counter(10,20)
x = iter(Hello())
for i in x:
print i
