Python基础B(数据类型----交互)
数据类型
数字类型
一、整型(int)
age = 18 % age=int(18)
print(id(age))
print(type(age))
print(age)
4530100848
<class 'int'>
18
可用于四则运算、整除取整、逻辑判断等
二、浮点型(float)
salary = 2.1 # salary=float(2.1)
print(id(salary))
print(type(salary))
print(salary)
4569240656
<class 'float'>
2.1
可用于四则运算、整除取整、逻辑判断等
字符串类型
name1 = 'nick'
name2 = 'egon'
print(id(name1))
print(type(name2))
print(name2)
4418849624
<class 'str'>
nick
字符串可进行+、*和逻辑比较
#拼接操作
msg2 = "my name is 'nick'"
msg3 = 'my name is "nick"'
print(msg2 + msg3)
#乘法操作
name = 'nick'
print(name * 10)
# 比较大小
msg1 = 'hello'
msg2 = 'z'
msg3 = 'hx'
print(msg1 > msg2)
print(msg1 > msg3)
print('Z' > 'A')
print('Z' > 'a')
my name is 'nick'my name is "nick"
nick nick nick nick nick nick nick nick nick nick
False
False
True
True
列表类型
# 定义
hobby = 'read'
hobby_list = [hobby, 'run', 'girl']
print(id(hobby_list))
print(type(hobby_list))
print(hobby_list)
# 使用
hobby_list = ['read', 'run', 'girl']
print(hobby_list[1])
hobby_list = ['read', 'run', ['girl_name', 18, 'shanghai']]
print(hobby_list[2][1])
4558605960
<class 'list'>
['read', 'run', 'girl']
run
18
字典类型
#字典套列表
user_info = {'name':'nick', 'gender':'male', 'age': 19, 'company_info':['oldboy', 'shanghai',50]}
print(user_info['name'])
print(user_info['company_info'][0])
#字典套字典
user_info = {'name':'nick', 'gender':'male', 'age':19, 'company_info':{'c_nmae':'oldboy', 'c_addr': 'shanghai', 'c_num_of_employee':50}}
print(user_info['name'])
print(user_info['company_info']['c_name'])
#取出students中第一个学生的姓名
students = {
{'name': 'nick', 'age': 19},
{'name': 'egon', 'age': 18}
}
print(students[0]['name'])
nick
oldboy
nick
oldboy
nick
布尔类型
print(bool(0))
print(bool('nick'))
print(bool(1 > 2))
print(bool(1 == 1))
# 除了0、None、空、False,其余所有布尔值均为True
print(bool(None))
print(bool(''))
print(bool([]))
print(bool({}))
print(bool(False))
False
True
False
True
False
False
False
False
False
解压缩
name_list = ['nick', 'egon', 'jason',]
x, y, z = name_list
print(f'x:{x}, y:{y}, z:{z}')
#告诉计算机不需要y了
x, _, z = name_list
#只输出z,之前的全部不输出
*_, z = name_list
#字典类型解压缩
info = {'name': 'nick', 'age': 10}
x,y = info
print(x,y)
x:nick, y:egon, z:jason
name age
与用户进行交互
print('_' * 20)
input("请输入你的姓名:")
print('*'*100)
name = input('请输入你的姓名:')
pwd = input('请输入你的密码:')
print(type(name))
print(type(pwd))
nick
请输入你的姓名:nick
请输入你的密码:123
<class ‘str’>
<class ‘str’>