第一种，最常用的，通过for in遍历数组
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colours = ["red","green","blue"]
for colour in colours:
print colour
# red# green# blue |
第二种，先获得数组的长度，然后根据索引号遍历数组，同时输出索引号
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colours = ["red","green","blue"]
for i in range(0, len(colours)):
print i, colour[i]
# 0 red
# 1 green
# 2 blue
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