写程序跟烹饪很像，

当然对门外汉的我们来说，“烹饪”是不准确用词，还是做饭炒菜更（tie）接（jin）地（shi）气（qing）一点。

从简单的食材基本的菜谱做起，把大米饭焖好先

在这个视频里我们两个程序实例继续不干涉程序执行顺序（美元换算成人民币、输入两个数值，输出和、差、积、商和余数），任由它们从上至下一条语句一条语句的执行

# ---------- MATH ON 2 VALUES ----------

# Ask the user to input 2 values and store them in variables num1 num2
# split() splits input using whitespace
num1, num2 = input('Enter 2 numbers separated by space: ').split()

# Convert the string into regular numbers Integer
num1 = int(num1)
num2 = int(num2)

# Add the values entered and store in sum
sum = num1 + num2

# Subtract values and store in difference
difference = num1 - num2

# Multiply the values and store in product
product = num1 * num2

# Divide the values and store in quotient
quotient = num1 / num2

# Use modulus on the values to find th remainder
remainder = num1 % num2

# Print the results
# format() loads the variable values in order into the {} placeholders
print("{} + {} = {}".format(num1,num2,sum))
print("{} - {} = {}".format(num1,num2,difference))
print("{} * {} = {}".format(num1,num2,product))
print("{} / {} = {}".format(num1,num2,quotient))
print("{} % {} = {}".format(num1,num2,remainder))

可谁让我们的现实生活充满了选择呢，

所以我们的程序语言必须加点选择分支处理的小料，

条件分支在这个视频里初试莺啼（“密码对否”和“你是吸血鬼不是爱丽丝”），

name = 'Bob'
age = 3000

if name == 'Alice':
    print('Hi, Alice.')

elif age < 12:
    print('You are not Alice, kiddo.')

elif age > 2000:
    print('Unlike you, Alice is not an undead, immortal vampire.')

elif age > 100:
    print('You are not Alice, grannie.')

else:
	print('Hi, did you know where Alice is?')

在下个视频里我们继续条件分支，会给出三个实例～～～