在文件中查找出现次数最多的数据

基于给定代码生成数字文件number.txt 读出numbres.txt中所有的数据
查找出出现次数最多的50个数，并将这些数写入文件top50.txt
写不出文件，不知道哪里出了问题，麻烦给看下。

with open("D:\\number.txt","r",encoding="utf-8") as file:
    nums = file.readlines()
 
dict_temp={}
for num in nums:
    dict_temp[num]=nums.count(num)
with open("D:\\top50.txt","w",encoding="utf-8") as file:
    a = sorted(dict_temp.items(), key=lambda x: x[1], reverse=True)[:50]
    for temp in a:
        file.write(temp)

主要是变量域的问题

dict_temp={}
with open("D:\\number.txt","r",encoding="utf-8") as file:
    nums = file.readlines()
    for num in nums:
        dict_temp[num]=nums.count(num)
with open("D:\\top50.txt","w",encoding="utf-8") as file:
    a = sorted(dict_temp.items(), key=lambda x: x[1], reverse=True)[:50]
    for temp in a:
        file.write(temp)