refers to python tutorial
for i, item in enumerate(iterable):
blablabla...
t1 = (1, 3, 5)
t2 = (2, 4, 6)
for item1, item2 in zip(t1, t2):
blablalba...
for i in reversed(xrange(1,10,2)):
print i
l = [1, 3, 3, 5]
for item in sorted(set(l)):
blablabla...
d = {'1': 'a', '2': 'b', '3': 'c'}
for k, v in d.iteritems(d):
blablabla...
a = 1
b = 2
if not a * 2 - b:
print 'hello'
如果接序列, 如果非空就代表真, 否则为假:a = [1, 3]
b = []
if a:
blabla...
if b:
blabla...
if a < b == c:
blabla...
这里先比较a<b, 然后比较b==c.a = ''
b = 'haha'
c = 'hehe'
d = a or b or c
d
>>> 'haha'
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