python函数指定默认值的实例讲解

>>> def student(name, age=18):
...   print('Hello, My name is ' + name + ', I am ' + str(age) + ' years old')
...
>>> student('bob')
Hello, My name is bob, I am 18 years old
>>> student('nicole')
Hello, My name is nicole, I am 18 years old
>>> student('bob', 20)
Hello, My name is bob, I am 20 years old

# 为两个参数指定默认值
def say_hi(name = "孙悟空", message = "欢迎来到编程网"):
  print(name, ", 您好")
  print("消息是：", message)
# 全部使用默认参数
say_hi()
# 只有message参数使用默认值
say_hi("白骨精")
# 两个参数都不使用默认值
say_hi("白骨精", "欢迎学习Python")
# 只有name参数使用默认值
say_hi(message = "欢迎学习Python")