python——day19作业

1.列举布尔值为false的值

  0   False  ‘’  []  {}  None

2.根据范围获取3和7整除所有数的和,并返回调用者:

符合条件的数字个数以及符合条件的数字的总和 如 def func(start,end):

方法1:递归
def  func(start,end,a=0,b=0):
    if start == end:
        return a,b
    if start % 3 == 0   and start % 7 ==0:
        a+=1
        b+=start

    ret = func(start+1,end,a,b)
    return ret

方法2:for循环
def func(start,end,a=0,b=0):
    for i in range(start,end):
        if i %3==0 and i%7 ==0:
            a+=1
            b+=i
    return a,b

3.使用set集合获取两个列表l1 = [11,22,33],l2 = [22,33,44]中相同的元素

l1 = [11,22,33]
l2 = [22,33,44]
s1 = set(l1)
s2 = set(l2)
v=s1&s2
print(v)

 4.定义一个函数统计字符串中大写字母、小写字母、数字的个数,并以字典为结果返回给调用者

int=[]
upstr=[]
lowstr=[]
def number(a, count_int = 0,count_upstr = 0,count_lowstr = 0):
    for i in a:
        if i.isdigit():
            int.append(i)
            count_int += 1
        elif i.isupper():
            upstr.append(i)
            count_upstr += 1
        elif i.islower():
            lowstr.append(i)
            count_lowstr += 1
    return int,upstr,lowstr,count_int,count_upstr,count_lowstr

a=number('shfSNFALSH1513')
print(a)

 5.

def func(arg):
    arg.append(55)

li = [11,22,33,44]
func(li)              此次是对li进行操作,li改变了
print(li)
li = func(li)           此次是让li等于函数func的返回值,因为func么有返回值,所以返回None
print(li)
运行结果:

[11, 22, 33, 44, 55]
None


原文地址:https://www.cnblogs.com/jgua/p/13519499.html