python占位符%s,%d,%r,%f

input接收的所有输入默认都是字符串格式

1、%s代表字符串占位符

conn, client_addr = phone.accept()
print(conn)
print(client_addr)
print(\'got a new connection from %s\' % (client_addr, ))
"""
<socket.socket fd=4, family=AddressFamily.AF_INET, type=SocketKind.SOCK_STREAM, proto=0, laddr=(\'127.0.0.1\', 8080), raddr=(\'127.0.0.1\', 55925)>
(\'127.0.0.1\', 65197)
got a new connection from (\'127.0.0.1\', 65197)
"""　

2、%d是数字占位符

>>> "金额：￥%d 元" % 1.5000
\'金额：￥1 元\'

　　占位符%d只能传递十进制整数。

3、占位符%f默认保留6为小数位，而第7位根据四舍五入取值

>>>\'%f\' % 1.12345678
\'1.123457\'