函数

一、　　邮箱发送程序

def sendmail(sendman, content, topic):
    try:
        import smtplib
        from email.mime.text import MIMEText
        from email.utils import formataddr

        msg = MIMEText(content, "plain", "UTF-8")
        msg["From"] = formataddr(["dsj", "deng_shj@hisuntech.com"])
        # msg["To"]=formataddr(["dsj","deng_shj@hisuntech.com"])
        msg["Subject"] = topic

        server = smtplib.SMTP("smtp.hisuntech.com", 25)
        server.login("deng_shj@hisuntech.com", "Twoman89837475")
        server.sendmail("deng_shj@hisuntech.com", [sendman, ], msg.as_string())
        server.quit()
    except:
        return "lost"
    else:
        return "good"


while True:
    em = input("pls input mailbox name: ")
    ct = input("pls input the content of the mail:")
    topic=input("pls input the topic:")

    if sendmail(em, ct,topic) == "lost":
        print("发送失败")
        break
    else:
        print("发送成功")

 

二、动态参数

def fun(*args1): #等同于传元组
    print(args1,type(args1))

fun([1,23,4,5,])

# 输出 ([1, 23, 4, 5],) <class 'tuple'>

fun("test")

# 输出('test',) <class 'tuple'>

def fun2(**args):  #等同于传字典
    print(args,type(args))

fun2(姓名="ddd",年龄="30")

# 输出{'姓名': 'ddd', '年龄': '30'} <class 'dict'>

def fun(*args):
    print(args,type(args))

fun(["alex",22])
# 输出(['alex', 22],) <class 'tuple'>

fun(*["alex",22])
# 输出('alex', 22) <class 'tuple'>

 

三、占位符

s="i am {0} , age {1}".format("alex",30) 

print(s)

四、动态函数举例说明：

s1="i am {0} , age {1}".format("alex",30)

print(s1)

s2="i am {0} , age {1}".format(*["alex",30])
print(s2)

s3="i am {name},  age{age}".format(name='alex',age='30')
print(s3)

dic={"name":"alex","age":30}
s4="i am {name},  age{age}".format(**dic)
print(s4)

# 以上全部输出 i am alex,  age30

 

五、传值还是传引用

# 内存指向
def f1(a1,a2):
    return a1+a2

def f1(a1,a2):
    return a1*a2

ret= f1(8,8)
print(ret)

# 传值还是传引用

def f2(a1):
    a1.append(999)

li=[11,22,33,44]
f2(li)

print(li)

# 传递引用