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数据类型：

• 数值数据类型：int、float、complex。
• 字符串数据类型：str。
• 序列类型：list、tuple、range。
• 二进制类型：bytes、bytearray、memoryview。
• 映射数据类型：dict。
• 布尔类型：bool。
• 集合数据类型：set、frozenset。

#Data Type
#String
print("Hello" [3])
print("Hello" + "world")
#Integer 
print(123 + 258)
#Float
print(1.23 + 25.8)

print(1.23 - 25.8)

#Boolean = TRUE/FALSE

项目 1：输入 Name 并将数字打印为字符。

no_char = len(input("What is your name?"))
#Converting integer into string 
new_no_char =  str(no_char)
print("Your name has "+ new_no_char + " characters.")

或

no_char = str(len(input("What is your name?")))

print("Your name has "+ no_char + " characters.")

>>

What is your name?Nidhi
Your name has 5 characters.

数据类型：数字相加 + 浮点数

a= float(123)
print(type(a))
print(70 +  float("100.25"))

>>
<class 'float'>
170.25

#This is string
print(str(152) + str(528))

>>
152528

print(3+5)
print(8-6)
print(6*4)
print(86/2)
print(2**5)

>>
8
2
24
43.0
32

计算的执行顺序： ??

#PEMDASLR 

#PRIORITY 1 : ()
#PRIORITY 2: **
#PRIORITY 3: * / 
#PRIORITY 4: + -

print(3*3+3/3-3)
>>
7.0
print(3*(3+3)/3-3)
>>
3.0

项目 2：计算 BIM（体重指数）

height = input("What is your height?")
weight = input("What is your weight?")
height_as_flot = float(height)
weight_as_int =  int(weight)
bmi = str(int(weight_as_int / height_as_flot ** 2 ))

print("Your Body Mass Index is " + bmi)

>>

What is your height?6.4
What is your weight?48
Your Body Mass Index is 1

1. 对数字进行四舍五入

print(8/3)
>>
2.6666666666666665

差异

print(round(8/3))

>>
3

2. 将上述计算转换为整数

print(8//3)

>>
2

3. 基于其先前值的操纵值

score= 0 
score += 1
print(score)

>>
1

score= 0 
score += 1
score += 1
print(score)

>>
2

f 字符串 ：

f-strings（格式化字符串文字）是一种在 Python 中将表达式嵌入字符串文字的方法，使用大括号 {}。

score= 0 
score += 1

height = 1.8
is_winning = True

print(f"Your score is {score}, your height is {height}, and your are winning is {is_winning}.")

>>
Your score is 1, your height is 1.8, and your are winning is True.

项目 3：计算人生剩余的时间

age = input("What is your age?")

years = 90 - int(age)
weeks = years*52
days = years*365

print(f"You have {weeks} weeks and {days} days left.")

>>
What is your age?42
You have 2496 weeks and 17520 days left.

检查数据类型：

a = int("28") / int(52.85)

print(type(a))

>>

<class 'float'>

项目 4：欢迎使用小费计算器！

print("Welcome to tip calculator!\n")

bill = float(input("What was the total bill? \n#34;))

tip = int(input ("How much tip would you like to give? 10,12 or 15?\n%"))

no_of_people = int(input("How many people to split the bill? \n"))

total_and_tip = tip / 100 * bill + bill

final_bill = total_and_tip / no_of_people

print(f"Each person should pay: {final_bill}")

>>

Welcome to tip calculator!

What was the total bill?
$100
How much tip would you like to give? 10,12 or 15?
%10
How many people to split the bill?
2
Each person should pay: 55.0

如果需要 2 个十进制值：

print("Welcome to tip calculator!\n")

bill = float(input("What was the total bill? \n#34;))

tip = int(input ("How much tip would you like to give? 10,12 or 15?\n%"))

no_of_people = int(input("How many people to split the bill? \n"))

total_and_tip = tip / 100 * bill + bill

bill_final_bill = total_and_tip / no_of_people

final_bill = "{:.2f}".format(bill_final_bill)  #WE ARE FORMATING

print(f"Each person should pay: {final_bill}")

>>

Welcome to tip calculator!

What was the total bill? 
$100
How much tip would you like to give? 10,12 or 15?
%10
How many people to split the bill? 
2
Each person should pay: 55.00