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def fab(max):

n, a, b = 0, 0, 1

while n < max:

print b

a, b = b, a + b

n = n + 1

# fab(5)

def fab1(max):

n, a, b = 0, 0, 1

L = []

while n < max:

L.append(b)

a, b = b, a + b

n = n + 1

return L

# for n in fab1(5):

# print n

# for i in range(1000):

# print i

#

# for i in xrange(1000):

# print i

class Fab(object):

def __init__(self, max):

self.max = max

self.n, self.a, self.b = 0, 0, 1

def __iter__(self):

return self

def next(self):

if self.n < self.max:

r = self.b

self.a, self.b = self.b, self.a + self.b

self.n = self.n + 1

return r

raise StopIteration()

for n in Fab(5):

print n

def fab2(max):

n, a, b = 0, 0, 1

while n < max:

yield b

a, b = b, a + b

n = n + 1

# for n in fab(5):

# print n

f = fab2(5)

f.next()

from inspect import isgeneratorfunction

print(isgeneratorfunction(fab2))

import types

print(isinstance(fab2, types.GeneratorType))

print(isinstance(fab2(5), types.GeneratorType))

from collections import Iterable

print(isinstance(fab2, Iterable))

print(isinstance(fab2(5), Iterable))

def read_file(fpath):

BLOCK_SIZE = 1024

with open(fpath, 'rb') as f:

while True:

block = f.read(BLOCK_SIZE)

if block:

yield block

else:

return