How to loop through all arrays in python

#How to iterate through all arrays in python? Here are two ways to traverse an array in Python:

#The first, the most commonly used, is to traverse the array through for in

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colours = ["red","green","blue"]
for colour in colours:
    print colour
# red
# green
# blue

The second method is to first obtain the length of the array, then traverse the array according to the index number, and output the index number at the same time

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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