String (string): arbitrary byte characters, single quote / double quotes / three pairs of marks represent
The basic string manipulation:
1. The value of the string read
(1) read the single subscript:
(2) slice (Slice):
1--> [superscript bottom left: right lower standard], Note: this does not include the lower right target value
2 -> saving mode subscript a colon: [lower left mark:]: beginning from the lower left to the end of the standard
[: Lower right standard]: equivalent to [0: lower right mark]
/ [:]: All values
3-> with a step size of the slice read [superscript bottom left: right lower standard: step]
4 -> small negative mark read, watch negative index starting at -1
(3) string combining (splicing)
(4) format string (%, format)
Mode 1:
Option 2:
(5) r / R of the original string control symbol
Note: This open folder address special needs
