#课后小结
今天是学习Python基础的第二天，对Python语言的认识又更近一步，学习了两天发现Python语言真的很简洁，使用也很方便。
#列表
# 在[]内，可以存放多个任意类型的值，并以逗号隔开
student=['A','B','C','D']
print(student[1])#B
#追加
student.append('E')
print(student)
#删除
del student[2]
print(student)
#切片
print(student[0:4:2])
#合并列表
student1=['E','F']
student.extend(student1)
print(student)
#字典dict
dict={'A':1,'B':2}
print(dict['A'])#[]取值
print(dict.get('A'))#get取值
print(dict.keys())
print(dict.values())
print(dict.items())
#while循环
'''
str1='tank'
while True:
name=input('名字').strip()
if name=='tank':
print('success')
break
print('请重新输入')
'''
# with open('A.txt','w',encoding='utf-8') as f:
# f.write('啦啦啦')
# with open('A.txt', 'r', encoding='utf-8') as f:
# res=f.read()
# print(res)
# with open('A.txt','a',encoding='utf-8') as f:
# f.write('我是快乐的小行家')
#图片转移
# with open('A.jpg','rb')as f_r,open('A1.jpg','wb')as f_w:
# res=f_r.read()
# f_w.write(res)
#无参函数
# def login():
# user=input('请输入用户名').strip()
# pwd=input('请输入密码').strip()
# if user=='yanshun'and pwd=='1234':
# print('successful')
# else:
# print('error')
# login()
#有参函数
# def login(username,password):
# user = input('请输入用户名').strip()
# pwd=input('请输入密码').strip()
# if user==username and pwd==passsword:
# print('success')
# else:
# print('error')
# login('yanshun','1234')
#位置参数
# def func(x,y):
# print(x,y)
# func(x=1,y=2)
#默认参数
# def foo(x=1,y=2):
# print(x,y)
# foo()
# foo(3,4)
#函数嵌套定义
# def func1():
# print('from func1')
# def func2():
# print('from func2')
