Python 教程 - 简介

print("hello world!")

python main.py

hello world!

number = 42username = "john doe"price = 2.95

number = 42username = "john doe"price = 2.95# display a value from variableprint("this is a number", number)print("price: ", price)# using formattingprint(f"hello, my username is {username}")

this is a number 42price:  2.95hello, my username is john doe

first = 4second = 2addition = first + secondsubtraction = first - secondmultiplication = first * seconddivision = first / secondmod = first % secondsquare_of_first = first ** 2print(f'{first} + {second} = {addition}')print(f'{first} - {second} = {subtraction}')print(f'{first} * {second} = {multiplication}')print(f'{first} / {second} = {division}')print(f'{first} % {second} = {mod}')print(f'{first} ** {2} = {square_of_first}')

4 + 2 = 64 - 2 = 24 * 2 = 84 / 2 = 2.04 % 2 = 04 ** 2 = 16

result = 29 // 5 # returns 5 (actual value before floor operation: 5.8)

# get username from inputusername = input("enter username: ")# get age from input# the int() function converts string into integer data typeage = int(input("enter age: "))print(f"username: {username}")print(f"age: {age}")

# get length from user inputlength = int(input("enter length: "))# get width from user inputwidth = int(input("enter width: "))# calculate the area of rectanglearea = length * width# display the resultprint(f"area of rectangle: {area}")

# get price from user inputprice = int(input("enter price: "))# get discount from user inputdiscount = int(input("enter discount: "))# calculate the discounted pricediscounted_price = price - (price * (discount / 100))# display the resultprint(f"original price: {price}")print(f"discounted price: {discounted_price}")