小甲鱼Python第018讲函数：灵活即强大 | 课后测试题及参考答案

1 def MyFun(x):
2     return x ** 3
3 y = 3
4 print(MyFun(y))

help(print)
Help on built-in function print in module builtins:

print(...)
    print(value, ..., sep=‘ ‘, end=‘\n‘, file=sys.stdout, flush=False)
    
    Prints the values to a stream, or to sys.stdout by default.
    Optional keyword arguments:
    file:  a file-like object (stream); defaults to the current sys.stdout.
    #文件类型对象，默认是sys.stdout（标准输出流）
    sep:   string inserted between values, default a space.
    #第一个参数如果是多个值（第一个参数是收集参数），各个值之间默认用空格（space）隔开
    end:   string appended after the last value, default a newline.
    #打印最后一个值之后，默认参数一个换行标识符（“\n”）
    flush: whether to forcibly flush the stream.
    #是否强制刷新流　4. 默认参数和关键字参数表面最大的区别是什么？

 1 def test(*params,base =3):
 2     sum = 0
 3     if params[-1] != 5:
 4         for each in params:
 5             sum +=each
 6         sum *=base
 7         print("结果是：",sum)
 8     else:
 9         base = 5
10         params = params[0:-1]
11         for each in params:
12             sum +=each
13         sum *=base
14         print("结果是：",sum)
15 test(1,2,3,5)
16 test(1,2,3,2,4,5,6,6,7)

 1 def  flower():
 2     for each in range(100,1000):
 3         temp = each
 4         sum = 0
 5         while temp:
 6             sum = sum +(temp %10)**3
 7             temp = temp //10
 8         if sum == each:
 9             print(each,end="\t")
10 print("不是水仙花数分别是：",end = "")
11 flower()

 1 def findstr(desStr,subStr):
 2     count = 0
 3     lenght  = len(desStr)
 4     if subStr not in desStr:
 5         print("没有")
 6     else:
 7         for each in range(lenght-1):
 8             if desStr[each] == subStr[0]:
 9                 if desStr[each+1] == subStr[1]:
10                     count +=1
11         print("出现次数：%d" % count)
12 
13 desStr = input("目标字符串：")
14 subStr = input("子字符串（两个字符）：")
15 findstr(desStr,subStr)

1 目标字符串：You cannot improve your past, but you can improve your future. Once time is wasted, life is wasted
2 子字符串（两个字符）：im
3 出现次数：3