Python Learning: String slicing operations

One: Takes the first character of a string

print "Hello" [0] indicates the first character in the output string
print "Hello" [-1] indicates the last character in the output string

Two: String segmentation

print "Hello" [1:3]

#第一个参数表示原来字符串中的下表
#第二个阐述表示分割后剩下的字符串的第一个字符 subscript in the original string

This sentence is a bit verbose, directly look at the output:

El

Three: Several special cases

(1) print "Hello" [: 3] Start with the first character intercept

(2) print "Hello" [0:] intercept from the first character and intercept to the last

(3) print "Hello" [:] the same (2)

Look at the results of the output:

Hel
Hello
Hello

Four: Step intercept

print "Hello" [:: 2]
print "Hello" [::-2]

Represents the intercept from the first character and takes one of the 2 characters in each interval.

Directly look at the output results:

Hlo
Olh

Python Learning: String slicing operations