笨办法学python3练习代码ex21.py

 def add(a, b):
     print(f"ADDING {a} + {b}")
     return (a + b) 

 def subtract(a, b):         #subtract  :减去的意思
     print(f"SUBTRACT {a} - {b}")
     return a - b 

 def multiply(a, b):
     print(f"MULTIPLY {a } * {b}")
     return a * b

 def divide(a, b):
     print(f"DIVIDE {a} / {b}")
     return a / b

 print("Let's do some math with just function!")
 age = add(30, 5)
 height = subtract(78, 4)
 weight = multiply(90, 2)
 iq = divide(100, 2)

 print(f"age: {age}, Height: {height}, Weight: {weight}, IQ: {iq} ")

 #A puzzle(难题、疑问) for the extra credit,type it in anyway
 print("Here is a puzzle.")

 #四则混合运算
 what = add(age, subtract(height, multiply(weight, divide(iq, 2))))
 print("That becomes: ",what, "Can you do it by hand? ")

注意在运行该代码时刚开始出现过一次错误：IndentationError: unindent does not match any outer indentation level。百度这条错误原因发现是因为定义函数的时候缩进有问题。但是我的缩进看上去没有问题。如何查看缩进是不是有问题？

在notepad++里面查看缩进：菜单中视图-->显示符号-->显示空格与制表符选项打钩。在查看时注意把notepad++界面最好调成白色比较好。方法：设置菜单->语言格式设置->选择主题（default即可）。