Python面试题：字符串连接

s = "hello""world"
print(s)

from io import StringIO
import sys
old_stdout = sys.stdout
result = StringIO()
sys.stdout = result
print('hello', 'world')
sys.stdout = old_stdout # 恢复标准输出
result_str = result.getvalue()
print("用逗号连接: ", result_str)

class Myclass:
    def __str__(self):
        return 'This is a Myclass Instance.'

my = Myclass()
s = s1 + str(my)
print(s)