# 局部参数 def func(x): print('方法体内x=', x) x = 2 print("change local x to", x) x = 50 func(x) print('x=', x) # tab键的空格作用 相当于{},层级的逻辑就靠它了 print('========================') print('使用默认参数') def say(message, time=1): # 不能反过来 print(message * time) say('hello') say('hello', 5) print('========================') print('关键参数') def func(a, b=5, c=10): print('a=', a, ',b=', b, ',c=', c) func(0) func(0, 0) func(0, 0, 0) func(0, c=1) print('========================') def maxNum(x, y): if x > y: return x else: return y num1 = int(input('1输入数字:')) num2 = int(input('2输入数字:')) print('max result:') print(maxNum(20, 30)) print('========================') print('文档字符串') def printMaxValue(x, y): '''print the max value of two ''' if x > y: print('x ') else: print('y') print(printMaxValue(1, 2)) print(printMaxValue.__doc__)

运行结果 C:\Users\dell\AppData\Local\Programs\Python\Python35\python.exe O:/Python/demo7_3.py 方法体内x= 50 change local x to 2

x= 50

使用默认参数 hello

hellohellohellohellohello

关键参数 a= 0 ,b= 5 ,c= 10 a= 0 ,b= 0 ,c= 10 a= 0 ,b= 0 ,c= 0

a= 0 ,b= 5 ,c= 1

1输入数字: