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’>