Python slice parsing,

Python slice parsing,

Slice prototype strs = 'abcdefg'

Strs [start: end: step]

 

The three parameters of the slice are table start, end, and step size respectively.

The first subscript is 0, and the end bit is not obtained, for example, strs [] = 'bc'

If start and end are out of the range of the existing array, truncate strs [-100:100] = 'abcdef' according to the actual range'

 

Strs [] = 'bcde' strs [] = 'bd'

Strs [5:1] =''

Start is blank. The default value is negative infinity strs [: 4] = 'abcd'

End is blank. The default value is infinite strs [2:] = 'cdefg'

Strs [:] = 'abcdefg'

Strs [1: 5:-1] =''

Start is blank. The default value is infinite strs [: 2:-1] = 'gfed'

End is blank. The default value is negative infinity strs [4:-1] = 'edba'

Strs [:-1] = 'gfedcba'