Python Learning Notes (iii)-Advanced features

I. Slicing

Slicing operations are similar to sublist in Java, which is to get a sub-list

For example l=[' Zhangsan ', ' Lisi ', ' Wangwu '] then l[0, 2] means to start at index 0, until index 2 (excluding 2), exactly 2 elements. If the first index is 0, you can also omit it.

Below we create a 0-99 series: L = Range (100)

1. Get the top 10 numbers: L[:10]

2. Get the last 10 numbers: l[-10:] # The index of the first element of the countdown is-1

3. Get the top 11-20: l[10:20]

4. Get the first 10 numbers, one for every two: L[:10:2]

5. In all numbers, take one of each of the 5: l[:: 5]

Tuple, string ' xxx ' or unicode string u ' xxx ' can also use slice manipulation

Two. Iteration

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Three. List-generated

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Four. Generator

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Python Learning Notes (iii)-Advanced features