python函数-语句

Posted 2020-10-16 dingkailinux

一、def语句和参数

#!/usr/bin/env python
#coding:utf-8
def hello(name):
    print(‘Hello ‘ +name)
hello(‘dingkai‘)
hello(‘lianghui‘)

1.变元：以上代码中，‘name‘是变元(“变元”是一个 变量);

（1）保存在变元中的值，在函数返回后就丢失

二、返回值和retrun语句

1返回值：函数调用求值的结果，称为函数的“返回值”。

2.return

（1）用 def 语句创建函数时，可以用 return 语句指定应该返回什么值。return 语句包

（2）含以下部分:
return 关键字;
函数应该返回的值或表达式。

#!/usr/bin/env python3
#coding:utf-8
import random
def getAnswer(answerNumber):
    if answerNumber == 1:
        return ‘It is certain‘
    elif answerNumber == 2:
        return ‘It is decidedly so‘
    elif answerNumber == 3:
        return ‘Yes‘
    elif answerNumber == 4:
        return ‘Reply hazy try again‘
    elif answerNumber == 5:
        return ‘Ask again later‘
    elif answerNumber == 6:
        return ‘Concentrate and ask again‘
    elif answerNumber == 7:
        return ‘My reply is no‘
    elif answerNumber == 8:
        return ‘Outlook not so good‘
    elif answerNumber == 9:
        return ‘Very doubtful‘
#r = random.randint(1,9)
#fortune = getAnswer(r)
#print(fortune)
print(getAnswer(random.randint(1,9)))