lesson4_ function

Function definition:

def function name ():

　　Member function (function Implementation code segment)

Function call:

　　Without argument:

　　　　Function name ()

　　There are parameters:

　　　　Function name (parameter values)

# Function definition 
DEF San ():
     Print ( " ! Shelter, shade " ) 

# call the function can be reused 
San () 
San ()

# Cash 
# user input: card, password and the withdrawal amount 
# ATM output: card, RMB 
DEF get_money_from_ATM (card_num, passwd, Money = 100): # Money is the default parameter
     Print (card_num)
     Print (passwd)
     Print (Money)
     IF of the type (card_num) == str and of the type (passwd) == str and of the type (Money) == int:
         Print ( " meet the requirements it can begin to withdraw money!! " )
     Pass 
# ordinary parameters 
get_money_from_ATM ( " 11,122,233,344,455 " , " 123456 " 200)    # normal
get_money_from_ATM("11122233344455",123456,200)     # 异常
指定参数：
get_money_from_ATM(card_num="11122233344455",passwd="123456",money=200)

get_money_from_ATM(card_num="11122233344455",passwd="123456"）

And parameter arguments

Parameter: the formal parameter. Defining a function, using parameter . The equivalent of placeholders.

Arguments: the function is called, is the argument .

　　　It must be determined value. So the argument is assigned in advance.

General parameters: positional parameters. According to the order parameter, into the argument.

Specified parameters: not in accordance with the order parameter. Parameter passing requirements: the parameter name argument value =

Default parameters: a parameter to a default value, only in the last parameter, can not put the middle

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