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#1.string / age = 30, print("我的年纪" + str(age)) #2.integer(整数) / age = 50 #3.Float（浮点数） #gpa = 3.3 #print(f'#我的GPA为 {gpa} 分') #4.string #name = “DerenSunan” #print(f'我的名字是 {name} ') #5.boolean (true, false) #U_loveme = True #print(f'你喜欢我吗？{U_loveme}') #print(type(U_loveme)) from functools import total_ordering from gettext import install from tkinter.font import names

#6.type casting(类型转换)

name = ”deren“

age = 25

gpa = 3.9

student = True

#显性转换 and 隐性转换

print(type(name))

print(type(age))

print(type(gpa))

print(type(student))

#同理将gpa变成int,Student变成str

student = str(student)

print(student)

print(type(student))

#7.input(取得使用者输入)

name = input('您的名字是：')

print(f'你的名字是{name}')

#设计填词游戏

adj_1 = input("请输入第 1 个形容词:")

noun = input("请输入名词:")

adj_2 = input("请输入第 2 个形容词:")

verb = input("请输入名词:")

adj_3 = input("请输入第 3 个形容词:")

print(f"今天我去了一个{adj_1}的动物园，在参观期间我看到了{noun}这个{noun}很{adj_2}，正在{verb}，我感到很{adj_3}")

#计算矩形面积

length = float(input("请输入矩形的长度（公分）:"))

width = float(input("请输入矩形的宽度（公分）:"))

area = length * width

print(f"面积为{area}平方公分")

#购物车程式

item = input("你想购买什么物品？")

price = float(input("价格多少？"))

quantity = int(input("你需要多少件？"))

total = price * quantity

print(f"你购买了{item}{quantity}，总价值￥{total}")

#8.加减乘除

apples = 10

apples += 2

print(apples)

apples += 5

print(apples)

apples -= 12

print(apples)

apples *= 3

print(apples)

apples /= 2

pprint(apples)

#9.指数（平方，三次方）

apples = 4

apples **= 2

print(apples)

apples **= 3

print(apples)

#10.模数mod(余数)

10 mod 3 等于 3 余 1

print(10 % 3)

11 mod 3 等于 3 余 2

print(11 % 3)

12 mod 3 等于 4 余 0

print(12 % 3)

#11.次方 pow（数学函数表示）

print(pow(2,5))

#12.Max（最大值）Min（最小值）

x = 1

y = 2

z = 3

print(max(x,y,z))

print(min(x,y,z))

#13.round(四舍五入)

a = 3.67

print(round(a))

#14.abs绝对值

b = -100

print("绝对值:",abs(b))

#15.round四舍五入（无条件进位/无条件舍去）

import math

x = 12.6

print(round(12.6))

print(math.ceil(x))

print(math.floor(x))

#圆周率Π

import math

print(math.pi)

#圆的周长

radius = float(input("请输入圆的半径"))

a = 2 * math.pi * radius

print(f"圆的周长为{round(a,2)}")

#圆的面积

area = float(input("请输入圆的半径"))

a = math.pi * radius ** 2

print(f"圆的面积为{area(a,2)}")

#16.if,else,elif（else if）控制流程

for_sale = True

if for_sale:

print("此项目正在出售")

else:

print("此项目未出售")

#注册流程检验

age = int(input("请输入你的年龄："))

if age > 65:

print("你年龄太大无法注册")

elif age >=18:

print("你可以注册")

else:

print("你必须年满18岁才可以注册")

#计算机程式 练习if,else,elif（else if）

operator = input("请输入运算符（加法：+，减法：-，乘法：*，除法：/，）：")

num1 = float(input("请输入第一个数字："))

num2 = float(input("请输入第二个数字："))

if operator == "+":

result = num1 + num2

elif operator == "-":

result = num1 - num2

elif operator == "*":

result = num1 * num2

elif operator == "/":

result = num1 / num2

else:

print("运算符号无效")

print(f"运算结果是{result}")

#体重转换器

weight = float(input("请输入你的体重："))

unit = input("你的体重是公斤还是磅？（kg/lb）").upper()

if unit == "KG":

weight *= 2.2

new_unit = "磅"

elif unit == "LB":

weight /= 2.2

new_unit = "公斤"

else:

print("单位不正确")

exit()

print(f"你的体重是{round(weight)}{new_unit}")

#温度转换器

unit = input("请输入当前的温度单位（摄氏 C，华氏 F）：").upper()

temp = float(input("请输入温度："))

if unit == "C":

temp = round(9 * temp / 5 + 32)

print(f"当前为 {temp} 华氏摄氏度")

elif unit == "F":

temp = round((temp-32) * 5 / 9)

print(f"当前为 {temp} 摄氏度")

else:

print("不符规格的温度计量单位")

#17.逻辑运算符 and 和 not

temp = int(input("请输入现在的温度："))

if temp >= 18 and temp <= 30:

print("温度很舒适")

else:

print("温度不适宜")

#18.字串方法（len(),find(),capitalize(),upper(),lower(),count(),replace,查询完整字符串help(str). #使用者全名

name = "code shibao 倒霉蛋"

#几个字元 len

length = len(name)

print("您的全名共有", length, "个字元。")

#找到第一个空格 find

space_pos = name.find(" ")

print("第一个空格出现在第", space_pos, "个字元。")

capitalize(开头第一个字母变大写)`

name_capitalized = name.capitalize()

print("你的全名(第一个字母大写)：", name_capitalized)

upper(你的字母全部大写)

name_upper = name.upper()

print("你的全名(全部大写)：", name_upper)

lower（你的字母全部小写）

name_lower = name.lower()

print("你的全名（全部小写）：", name_lower)

count()

phone_number = input("请输入你的电话号码")

dash_count = phone_number.count("-")

print("你的电话号码中共有", dash_count, "个短横线。")

replace()

phone_number = input("请输入你的电话号码")

phone_number = phone_number.replace("-","")

print("您的电话号码（短横线换成空格）:", phone_number)

#验证使用者输入的合法性(你的使用者名称不能超过12个字元，不能包含空格，不能包含数字，如都符合显示 欢迎 + 使用者名称)

username = input("请输入你的使用者名称：")

if len(username) > 12:

print("你的使用名称不能超过12个字元。")

elif " " in username:

print("你的使用名称不能包含空格。")

elif not username.isalpha():

print("你的使用名称不能包含数字。")

else:

print("欢迎" + username)

#19.索引运算符(第一个字元，第二个字元，第五个字元，最后一个字元)

credit_number = "1234-5678-9999-8888"

first_char = str(credit_number)[0]

print("第一个字元 is", first_char)

credit_number = "1234-5678-9999-8888"

second_char = str(credit_number)[1]

print("第二个字元 is", second_char)

credit_number = "1234-5678-9999-8888"

five_char = str(credit_number)[0:6]

print("第五个字元 is", five_char)

credit_number = "1234-5678-9999-8864"

last_char = str(credit_number)[-1]

print("最后一个字元 is", last_char)

credit_number = "1234-5678-9999-8864"

last_two_char = str(credit_number)[-2]

print("最后两个字元 is", last_two_char)

#Email程式

email = "derensunan@gmail.com"

index = email.index("@")

print(index)

print(email[:index])

print(email[(index+1):])

#20.f-string字符串格式化(精准取小数)

price_1 = 32.38128

price_2 = -3234

price_3 = 7.212

print(f"price 1 is {price_1:.2f}\n"

f"price 2 is {price_2:.2f}\n"

f"price 3 is {price_3:.1f}\n")

#需要显示字符前正负符号

print(f"price 1 is {price_1:+.2f}\n"

f"price 2 is {price_2:+.2f}\n"

f"price 3 is {price_3:+.1f}\n")

#需要显示字符向左，向右，置中（<, >, ^）

print(f"price 1 is {price_1:^20.2f}\n"#^后的数字代表位数

f"price 2 is {price_2:^20.2f}\n"

f"price 3 is {price_3:^20.1f}\n")

#混合不同符号,需要显示字符20位并置中，并显示正负

print(f"price 1 is {price_1:^+20.2f}\n"#^后的数字代表位数

f"price 2 is {price_2:^+20.2f}\n"

f"price 3 is {price_3:^+20.1f}\n")

#21.while(无限循环)登录程式循环验证，直到不满足While条件

name = ""

while name == "":

name = input("Your name:")

print(f"Hello, {name}!")

#该死的小可爱

food = input("please enter your favorite food")

while food != "fuck you":

print(f"Turns out you like such disgusting that {food}")

food = input("please enter your favorite food:")

print("Good Bye!~")

num = int(input("PLS enter a number from 1 to 100 :"))

while num < 1 or num > 100:

print(f"You sb read the question clearly and then answer it again")

num = int(input("PLS enter a number from 1 to 100 :"))

print(f"Your right !!!")

#复利计算机(总金额=本金*（1+（利率/100））)**时间 amount = 0 rate = 0 time =0

while amount <= 0: amount = float(input("PLS enter your principal :")) if amount <= 0: print("The principal cannot be less than or equal to zero") print("Your principal is", amount)

while rate <= 0: rate = float(input("PLS enter rate percent:")) if rate <= 0: print("The rate cannot be less than or equal to zero") print("Your rate percent is", rate)

while time <= 0: time = int(input("PLS enter your holding period :")) if time <= 0: print("The period cannot be less than or equal to zero") print("Your holding period is", time)

#(总金额=本金*（1+（利率/100））)**时间 total_amount = amount * (1 + (rate / 100)) ** time profit = total_amount -amount

print("Your total amount is :", round(total_amount, 3)) print("Your profit is :", round(profit,3))