老男孩python全栈就业班第9期第1部分基础+模块+面向对象+网络编程第3天-str索引切片

str索引切片

s = 'ABCDCLSESRF'

#索引
s1 = s[0]
print(s1)

s2 = s[2]
print(s2)

#切片，顾头不顾尾
s3 = s[0:4]
print(s3)

s4 = s[-1]
print(s4)

s5 = s[0:]
print(s5)

s6 = s[:]
print(s6)

s7 = s[0:0]
print(s7)

#s[首:尾:步长]
s8 = s[0:5:2]
print(s8)

s9 = s[4:0:-1]
print(s9)

s10 = s[3::-1]
print(s10)

s11 = s[3::-2]
print(s11)

s12 = s[-1::-1]
print(s12)

s13 = s[::-1]
print(s13)