第 018讲：函数：灵活即强大

Posted 2020-11-08 此名称已经存在

数：

0.形参和实参：

>>> def saysomething(name, words): \\\\name是形参； Jenny是实参
print(name + \'->\' + words)

>>> saysomething("jenny", "happy")
jenny->heppy

1.关键字函数：

>>> def saysomething(name, words):
print(name + \'->\' + words)

 

>>> saysomething(words = "happy", name = "jenny")
jenny->happy

2. 默认函数：

>>> def saysomething(name = "jenny", words = "happy"):
print(name + \'->\' + words)

>>> saysomething()
jenny->happy

 

>>> def saysomething(name, words):
print(name="jenny" + \'->\' + words="happy") \\\\不能在print里面赋实参

SyntaxError: invalid syntax

3. 收集函数（可变参数）：

 

>>> def test(* paratest):
print("有 %d 个参数" % len(paratest)) \\\\  不明白
print("第二个参数是：", paratest[1])

 

>>> test(\'j\',\'e\',\'n\',\'n\',\'y\')
有 5 个参数
第二个参数是： e