guoyunce-python-day01

guoyunce-python-day01

简单输入输出

# 初始程序
print('hello world')
# 变量
# 变量名 = 变量值
name = "Eric"
name = input("请输入您的名字")
age = 18
addr = "沈阳市"
print("name = ", name, "age = ", age, "addr = ", addr)

数据类型转换

# 数据类型
# 数字类型
# 整数 int
# age = 100
week = 7
# print(type(age))
print(type(week))  # 

# 浮点数  float
height = 1.80
print(type(height))# 

# 字符串  string
name = 'eric'
print(type(name))  # 
# 输入年龄 , 告诉用户 50年后多大

age = input("请输入你的年龄")
# age = "22"
print(type(age))
# 数据类型转换
age = int(age)
print(type(age))

age = age + 50
print("50 年后您", age, "岁")

print("你的身高是 " + str(1.88))
height = "1.67"
print(float(height) + 1.2)

运算符

# 运算符

# 算术运算符  + - * / 除法  // 整除吧  a**b  a的b次方 % 取模(余数)
a = 5
b = 2
print(a%b)
print(a/b)
print(a//b)
print(a**b)
# 赋值运算符 =   += -= *=  /= %=
age = 10
# age = age + 50
age += 50
print(age)

# 比较运算符  == 等于  != 不等于   >  <  >= <=
math = 90
music = 80
english = 89
print(math == english)
print(math != english)
print(math >= music)
print(math <= music)

# 逻辑运算  与 and  或 or 非  not

print(math >=90 and english >=90)
print(math >=90 or english >=90)
print(not (math >=90))
print(not music)
print(not 0)

条件判断

bmi计算器

# 计算公式为：BMI=体重÷身高2。（体重单位：千克；身高单位：米。）
"""
分类	BMI 范围
偏瘦	<= 18.4
正常	18.5 ~ 23.9
过重	24.0 ~ 27.9
肥胖	>= 28.0
"""

# 思路

# 输入体重
weight = input('请输入你的体重')

# 输入身高
height= input("请输入你的身高")
weight = float(weight)
height= float (height)

# 计算 bmi
bmi = weight/ height **2
print("bmi = ", bmi)


# 判断提示
if bmi <= 18.4:
    print("偏瘦")
elif bmi >=18.5 and bmi <= 23.9:
    print("正常")
elif bmi >= 24 and bmi <= 27.9:
    print("过重")
elif bmi >= 28:
    print("肥胖")

字符串格式化

# 字符串格式化
name = "eric"
age = 19
addr = "沈阳"
## 1print 可以一次输出多个变量
print("name = ", name, "age = ", age, "addr = ", addr)
# 2 %输出  %s 是str的意思  %d 整数  %f 小数
print("name = %s, age = %d, addr = %s"%(name, age, addr))

# 3 format 输出
print("name = {}, age = {}, addr = {}".format(name, age, addr))

# 4 f字符串输出
print(f"name = {name}, age = {age}, addr = {addr}")