Shulou(Shulou.com)06/02 Report--

This article introduces "how to use python [:-1] and [::-1]" related knowledge, in the actual case operation process, many people will encounter such a dilemma, then let the editor lead you to learn how to deal with these situations! I hope you can read it carefully and be able to achieve something!

1. Case interpretation

A='python'b=a [::-1] print (b) # nohtypc=a [::-2] print (c) # nhy#, the last position is-1d=a [:-1] # the number before position 0 to position-1 print (d) # pythoe=a [:-2] # from position 0 to position-2 print (e) # pyth

2. Usage instructions

B = a [i j] means to copy a [I] to a [j-1] to generate a new list object

B = a [1:3] # [1] when I defaults, it defaults to 0, that is, a [: 3] equals to a [0:3]. When j defaults, it defaults to len (alist), that is, a [1:] equals to a [1:10]. When ijis all default, a [:] is equivalent to a complete copy of a.

B = a [i:j:s]: iMagol j is the same as above, but s means step by step, the default is 1. So a [i:j:1] is equivalent to a [I: J] when s

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.