python3基本操作和函数详解

第一次实验

>>> ask_ok('Are you a doubi?')
Are you a doubi?no
False

第二次实验

>>> ask_ok('Are you a doubi?',2)
Are you a doubi?doubihao
Yesorno ,please!
Are you a doubi?wobushidoubi
Yesorno ,please!
Are you a doubi?minashangohayou
Traceback (most recent call last):
  File"<pyshell#81>", line 1,in<module>ask_ok('Are you a doubi?',2)
  File"<pyshell#74>", line 10,inask_okraiseIOError('refusenik user')
OSError: refusenik user

in关键字
测定序列中知否包含某个值

********重要提示
默认值只被赋值一次,这个最好拿链表说话

>>>deftryy1(a,listt=[]):
    listt.append(a)returnlistt>>> tryy1(1)
[1]>>> tryy1(2)
[1, 2]>>> tryy1(3)
[1, 2, 3]