EX32

the_count = [1, 2, 3, 4, 5]
fruits = ['apples', 'oranges', 'pears', 'apricots']
change = [1, 'pennies', 2, 'dimes', 3, 'quarters']

# this first kind of for-loop goes through a list
for number in the_count:
    print "This is count %d" % number
    
# sanme as above
for fruit in fruits:
    print "A fruit of type: %s" % fruit
    
# also we can go through mixed lists too
# notic we have to use %r since we don't know what's in it
for i in change:
    print "I go %r" % i
    
# we can also build lists, first start with an empty one
elements = []

# then use the range function to do 0 to 5 counts
for i in range(0 ,6):
    print "Adding %d to the list." % i
    # append is a function that lists understand
    elements.append(i)
    
# now we can print them out too
for i in elements:
    print "Element was: %d" % i
    

for:用来循环和打印各种各样的列表

elements.append():append向后面添加元素，参数可以是任何东西，将作为元素添加到列表尾部。

rang():如果你需要一个数值序列，使用内建函数range() 会很方便，它产生等差级数序列。