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This article focuses on "how to understand the slicing and copying of python lists". Interested friends may wish to have a look. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn how to understand the slicing and copying of python lists.

Slicing, that is, processing part of the data in a complete list.

Syntax variable [start index: end index: step size]

First create a list of strings

> cars = ['toyota',' honda', 'mazda',' nissan', 'mitsubishi',' subaru', 'suzuki',' isuzu'] > cars ['toyota',' honda', 'mazda',' nissan', 'mitsubishi',' subaru', 'suzuki',' isuzu']

View only the first three elements of the list

> print (cars [0:3]) ['toyota',' honda', 'mazda']

You can also not specify the starting index bit, which starts from 0 by default

> print (cars [: 3]) ['toyota',' honda', 'mazda']

View the third to fifth elements of the list

> > print (cars [2:6]) ['mazda',' nissan', 'mitsubishi',' subaru']

View the value from the third to the end of the list, without specifying the termination index bit, default to the end of the list

> print (cas [2:]) ['mazda',' nissan', 'mitsubishi',' subaru', 'suzuki',' isuzu']

From the above two examples, we can see that when slicing, we follow the principle of "head without tail".

Print all values in a list with step 2

> > print (cars [:: 2]) ['toyota',' mazda', 'mitsubishi',' suzuki']

Copy the data from the cars list to the vivi list

> vivi = cars [:] > vivi ['toyota',' honda', 'mazda',' nissan', 'mitsubishi',' subaru', 'suzuki',' isuzu'] > del cars > vivi ['toyota',' honda', 'mazda',' nissan', 'mitsubishi',' subaru', 'suzuki',' isuzu'] so far, I believe you have a better understanding of "how to understand the slicing and copying of python list" You might as well do it in practice. Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!

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