Python初级 2 记住内存和变量的练习

一、数据类型:

数字:3, 5, 100, 50.35

字符串:“abc”,“wang”

image

字符串或数字可以由名字来表示,名字也叫变量

 

 

二、算术表达式:

形如3 + 5, 3 * 5

1 数字和符号的组合,Python可以算出它的值

(3 + 5)* 742 - 19)* 3

2 由变量和符号组成,Python可以算出它的值也是算术表达式

a = 3
b = 4
c = 5
a + b
(a + b) * c

三、 输入:

input("请输入你的姓名:")

 

 

练习:

1 数字:

print(3)
print(100)
print(2.57)
print(300.56)

2 字符串

print("teacher")
print("student")
print("wang lao shi")
print("li lao shi")
print("zhang lao shi")
print("请输入数字")
print("请输入你的姓名")

3 变量

num = 3
print(num)
num = 3.15
print(num)
num = 100
print(num)
teacher = "wang lao shi"
print(teacher)
teacher = "li lao shi"
print(teacher)

4 算术表达式一

print(3+5)
print(3*5)
print((3+5)*4)
print((11-9)*9)
print((15-8)*(2+5))
print((25-9)*3-(13-5))
print((5+3)*4-(15-9)*2)
print((3+2)*4+9*5+9)

5 算术表达式二

a = 2
b = 3
c = 4
d = 6
sum = a + b
print(sum)
sum = c + d
print(sum)
sum = a + b + c + d
print(sum)
sub = b - a
print(sub)
sub = d - c
print(sub)
mul = a * b
print(mul)
mul = c * d
print(mul)
mix = (a + b) * c
print(mix)
mix = (a + b) * (c + d)
print(mix)

6 输入

image

posted @ 2019-07-14 09:40  绿色的麦田  阅读(315)  评论(0编辑  收藏  举报