Python 字符串
# 字符串
string = 'My name'
string = "My name"
string = '''My name'''
res = string[0] # 字符串的索引
res = string[0:2]# 从０到１
res = string*2 # 重复
res = string+'is lly' #拼接
res = string.split(sep=' ')
res = string.lower() #全部字母变小写
print(res)
注:string是不支持修改的（不可变
