python遍历数组的两种方法

python遍历数组的两种方法

第一种，最常用的，通过for in遍历数组

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

colours = ["red","green","blue"]

for i in range(0, len(colours)):
    print i, colour[i]

# 0 red
# 1 green
# 2 blue