花式赋值、列表、字典、解压缩、input()、格式化学习笔记

#方式一
i=10
j=20
j,i=i,j#i与j的值互换
#方式二
i=10
j=20
z=i
i=j
j=z

hobby_list=['read','run','girl']
print(hobby_list[1])#打印结果为run

user_info={'name':'xiaomei','age':18,'company':'orange technology'}
print(user_info['name'])#结果为xiaomei
print(user_info)#结果为{'name':'xiaomei','age':18,'company':'orange technology'}

user_info={'name':'xiaomei','age':18,'company':['orange technology','shanghai',100]}
print(user_info['company'][0])#结果为orange technology   print(字典名[key][索引号])

user_info={'name':'xiaomei','age':18,'company':{'c_name':'orange technology','c_location':'shanghai','employee':100}}
print(user_info['company']['c_location'])#结果为shanghai   print(字典名[key][key])

name_list=['xiaohua','xiaoming','xiaozhang']
x,y,z=name_list
print(f'x:{x},y:{y},z:{z}')#x:xiaohua,y:xiaoming,z:xiaozhang
print(x,_,z)#xiaohua,xiaozhang如果某个元素不是我们需要的，就在其对应的位置将其用下划线替代

name_list = ['nick', 'egon', 'jason', 'tank', 'kevin', 'jerry']
#x, y, _, _, _, z = name_list
x, y, *_, z = name_list
print(*_)# *_将列表中不需要的元素都放在了这里

info={'name':'xiaomei','age':18}
x,y=info
print(x,y)# 结果name age

input('请输入你的名字：')#执行情况为 请输入你的名字：
#不论用户输入的是什么类型的字符或数字，都会被转化为字符串格式，与python2中的raw_input相同，
#在python2中input会保留输入的数据类型

name='xiaomei'
age=19
print(f"Hello,{name}. your age is {age}.")

a=3.1415926
print(f'{a:.3f}')

name='xiaomei'
age=19
print("Hello,%s. your age is %d."%(name,age))
#Hello,xiaomei. your age is 19.

name='xiaomei'
age=19
print("Hello, {}. your age is {}.".format(name,age))