字符串的拼接 + | 字符串的重复 * | 字符串跨行拼接 | 字符串的索引

# ### 字符串的相关操作
# (1)字符串的拼接 +
strvar1 = "我爱你,"
strvar2 = "亲爱的菇凉"
res = strvar1 + strvar2
print(res)

# (2)字符串的重复 *
strvar1 = "重要的事情说三遍"
res = strvar1 * 3
print(res)

# (3)字符串跨行拼接 
str1 = "sdfsssssssssssssssssssssssssssssssssssssssssssss" 
"sssdsfsdfasdf" 
"你说的手"
print(str1)

# (4)字符串的索引
#          0 1 2 3 4 5 
strvar = "道路一片光明"
#         -6-5 -4-3-2-1
res = strvar[4]
print(res)
res = strvar[-2]
print(res)