cf 160 div2 A python搞的水题一枚

import sys
#from bs4 import BeautifulSoup
def countLuckyDigit(x):
    cnt=0
    while x>0:
        d=x%10
        x=x//10
        if d==4 or d==7:
            cnt=cnt+1
    return cnt
n,k=map(int,raw_input().split())
a=map(int,raw_input().split())
result=0
for x in map(countLuckyDigit,a):
    if x<=k:
        result+=1
print (result)  

第一次用python写的cf 水题一枚