How to traverse list in python

4 methods of List traversal:

Method 1:

for i in list: print i

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Method 2:

for i in range(len(list)): print i, list[i]

Method 3:

for i in xrange(len(list)): print i, list[i]

Method 4:

for i, j in enumerate(list): print i, j

The difference between xrange and range:

range will directly generate a list object from all results.

xrange will not directly generate a list, but a generator that will return one value each time it is called.

Therefore, the loop performance of xrange is better than range, especially when the list returned is very large. But when you need to return a list, you can use range.

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