Python学习笔记_week3

 1 def test(x):
 2     "The function definitions"
 3     x+=1
 4     return x
 5 def :定义函数的关键字
 6 test:函数名
 7 ():内可定义形参
 8 "":文档描述(非必要,但强烈建议写上)
 9 x+=1:泛指代码块或程序处理逻辑
10 return:定义返回值

 1 #函数
 2 def func1():
 3     ‘‘‘testing1‘‘‘
 4     print(‘in the func1‘)
 5     return 0
 6 
 7 #过程(没有返回值的函数,但python中隐式的返回None,所以python中区别不大了)
 8 def func2():
 9     ‘‘‘testing2‘‘‘
10     print(‘in the func2‘)
11 
12 x=func1()
13 y=func2()
14 print(x,y)

 1 import time
 2 def logger():
 3     time_format=‘%Y-%m-%d %X‘
 4     time_current=time.strftime(time_format)
 5     with open (‘a.txt‘,‘a+‘) as f:
 6         f.write(‘%s end action\n‘%time_current)
 7 
 8 def test1():
 9     print(‘in the test1‘)
10     logger()
11 def test2():
12     print(‘in the test2‘)
13     logger()
14 def test3():
15     print(‘in the test3‘)
16     logger()
17 test1()
18 test2()
19 test3()

 1 ‘‘‘def test1():
 2     print(‘in the test1‘)
 3     return 0
 4     # print("test end") # 碰到return，终止程序运行返回0,所以不会被打印
 5 x=test1()
 6 print(x)‘‘‘
 7 
 8 def test1():
 9     print(‘in the test1‘)
10 def test2():
11     print(‘in the test2‘)
12     return 0
13 def test3():
14     print(‘in the test3‘)
15     return 1,‘hello‘,[‘alex‘,‘wupeiqi‘],{‘name‘:‘alex‘}
16 x=test1()
17 y=test2()
18 z=test3()
19 print(x)
20 print(y)
21 print(z) #放到一个元组里返回

1 def test(x,y):
2     print(x)
3     print(y)
4 test(1,2) #与形参一一对应，位置参数调用
5 test(y=1,x=2) #与形参顺序无关，关键字调用
6 # test(3,x=1) 报错，多个值给x
7 # test(x=2,3)  #报错，关键参数不能写在位置参数之前

1 def test(x,y=2):
2     print(x)
3     print(y)
4 test(1)  #默认参数，不赋值就是2，赋值就为赋的值
5 
6 def test(x,soft1=True,soft2=True):#默认安装值
7     pass
8 def conn(host,port=3306):#默认端口号
9     pass

 1 def test(*args):  #接受N个位置参数，转化成元组的形式
 2     print(args)
 3 test(1,2,3,4,5,6)  # 参数组，实参数目不固定，形参用*定义
 4 
 5 test(*[1,2,3,4,5,6]) # args=tuple[1,2,3,4,5,6]
 6 
 7 def test1(x,*args):
 8     print(x)
 9     print(args)
10 test1(1,2,3,4,5,6,7) #与位置参数结合起来
11 
12 def test2(**kwargs):  # **kwrgs，接受n个关键字参数，转换成字典的方式
13     print(kwargs)
14     print(kwargs["name"])
15     print(kwargs["age"])
16     print(kwargs["sex"])
17 test2(name="alex",age=8,sex=‘F‘)
18 # test2(**{"name":"alex","age":8})
19 
20 def test3(name,**kwargs):
21     print(name)
22     print(kwargs)
23 test3("alex",age=18,sex=‘m‘)
24 
25 def test4(name,age=18,**kwargs): #参数组往后放
26     print(name)
27     print(age)
28     print(kwargs)
29 test4("alex",sex=‘m‘,hobby="tesla",age=3)
30 
31 def test5(name,age=18,*args,**kwargs):
32     print(name)
33     print(age)
34     print(args)
35     print(kwargs)
36 test5("alex", age=34,sex=‘m‘,hobby="tesla")

1 def logger(source):
2     print("from %s" % source)
3 def test5(name,age=18,*args,**kwargs):
4     print(name)
5     print(age)
6     print(args)
7     print(kwargs)
8     logger("TEST5")
9 test5("alex", age=34,sex=‘m‘,hobby="tesla")