python学习笔记 day05 习题讲解

输入一个字符串(由数字和字母组成,连续数字记为1,输出字符串中连续数字的个数)

s='ajjs235djk123jkasjak34aks12k1'  #输出5
count=0
for i in range(len(s)):
    if i==0:
        if s[i].isdigit() and not s[i+1].isdigit():
            count+=1
    else:
        if i==len(s)-1:
            if s[i].isdigit():
                count+=1
        if s[i-1].isdigit() and not s[i].isdigit():
            count+=1
print(count)

运行结果:

F:\workspace_python\pycharm_projects\venv\Scripts\python.exe F:/workspace_python/pycharm_projects/fullstack2018-08-17/week2/day07/01.py
5

另一种解法:

s=input('>>>')
for i in s:   #这里面的s还是原来输入的那个
    if i.isalpha():
        s=s.replace(i,' ')  #这里虽然进行了替换,replace方法产生一个新的字符串对象又重新赋值给s
L=s.split()
print(L,len(L))

 

运行结果:

>>>jks12jskdk9283sjkdsjk223
['12', '9283', '223'] 3

 

posted @ 2018-08-21 16:07  写的BUG代码少  阅读(150)  评论(0编辑  收藏  举报