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我们想要对一个字符串中的大小写和数字进行区分，那么我们就必须用到三个内置的函数对我们输入的字符串内容进行判断
1.str.isupper()#用来判断是否为大写字母
2.str.islower()#用来判断是否为小写字母
3.str.isdigit#用来判断是否为数字
if 'M'.isupper(): print('M') #输出结果为M
#剩余两个函数同样的用法，用来判断一个字符串中的某一字符是否为其结果，如果对整体字符串进行判断则全真为真 if 'Mako'.isupper():
print('Mako') #输出结果为None
有了对于以上三个函数用法的初步认识，我们开始编写整体程序
list1=[] list2=[] list3=[]#首先创建三个空列表用来盛装不同类型的对象 a=input('输入')#要求输入一段字符串 for i
in a:#对于我们输入的字符串从第0项进行单个循环并对每个单独的字符进行判断是否为我们所找的对象类型 if
i.isupper():#如果字符为大写字母，则进入第一个分支 list1.append(i)#将满足条件的对象放入第一个列表中 if
i.islower(): list2.append(i) if i.isdigit(): list3.append(i)
print('大写字母数为',len(list1))#列表的长度即元素的个数，元素的个数即满足我们条件的对象的个数这样我们就解决了问题
print('小写字母数为',len(list2)) print('数字的个数为',len(list3))
