详解python字符串相关str

#for循环迭代
name = 'Chengwei'
for ch in name:
    print(ch, end=' ')
#C h e n g w e i
#索引
print(name[1])
#h
print(name[-1]) #最后一个为 -1
#i
#len()函数返回str字符串数量
print(len(name))
#8

message = 'hello' + 'world'
print(message)
#helloworld

message = 'helloworld'
print(message[2:4])
#ll

message = 'helloworld'
if 'hello' in message:
    print('YES')
#YES
if 'aaa' not in message:
    print('YES')
#YES

print('hello' * 2)
#hellohello

message = 'hello world chengwei'
message_list = message.split()
print(message_list)
#['hello', 'world', 'chengwei']
message = 'hello,world,chengwei'
message_list = message.split(',')
print(message_list)
#['hello', 'world', 'chengwei']