s = "Hello" + " " + "world" + " I"

print(s)

liststr = ['Hello','World','I']

strlist = ''.join(liststr)

print('转换后的数据类型是：',type(strlist))

print('转换后的数据是：',strlist)

s = "{} {}".format('Hello','World')

print('输出结果是：',s)

s1 = "{0} {1}".format('Hello','world')

print('s1的结果是 {}'.format(s1))

s2 = "{a} {b}".format(a='Hello',b='world')

print('s2的结果是 {}'.format(s2))

s = "%s %s "%('Hello','world')

print(s)

s=(

  'hello' + '\n'

  ''

  'World' + '\n'

  '!'

)

print(s)

s1="Hello"

s2="World"

print(f'{s1} {s2}')