python代码题，对里面的知识点有困惑

对字符串相关内容不熟悉，想知道里面的要求要用什么语句来满足，诚恳求学，希望能够解答

def count(s):
  alpha,num,space,other=0,0,0,0
  for i in s:
    if i.isalpha():
        alpha+=1
    elif i.isdigit():
        num+=1
    elif i.isspace():
        space+=1
    else:
        other+=1
  print('英文字符数{},数字字符数{},空格字符数{},其他字符数{}'.format(alpha,num,space,other))
  if alpha==len(s):
      return 1
  return 0
t=0
l=[]
for i in range(10):
    s=input("请输入一个字符串：")
    l.append(s)
    t+=count(s)
if t==10:
    for i in l:
        print(i.upper ())
else:
    print('不存在单纯字母字符串')

a = []
b = {}
d = []
e = 0
for i in range(10):
    c = input()
    for i in c:
        b[i] = b.get(i,0)+1
    a.append(b)
    d.append(c)
    b = {}
for i in a:
    for key,value in i.items():
        print("{}:{}".format(key,value),end = " ")
    print("",end = "\n")
for i in d:
    if i.isalpha():
        e = 1
        print(i.upper())
if e == 0:
    print("no")

# -*- coding:utf-8 -*-
from collections import Counter

str = input('请输入一个十位数的字符串： ')

## abcaedolds
if len(str) != 10:
    print('{} 字符串个位数不是10位'.format(str))
else:
    for k,v in dict(Counter(str)).items():
        print( '字符 {} 出现的次数是 {} 次'.format(k,v) )


if str.isalpha():
    result = str.upper()
    print('{} 转化成大写字母是 {}'.format(str , result))
else:
    print( '不存在单纯字母字符串' )