python - 如何计算唯一名称？

Question

我正在尝试计算文件名中以“From:”开头的唯一名称。然而，我不断收到一长串数字。我的代码实际读取的是什么以及如何解决这个问题？

count = 0
name = []
fname = input("What is your file name? Enter it here: ")

try:
    fname = open(fname)
    name = set(f.readlines()) 
except:
    print ("That file does not exist.")
for name in fname:
    if name.startswith("From:"):
        count = len(name)  
        print (count)

Answer 1

我们可以使用set来保存所有必需的名称并找到其长度来获得计数:

file_name = input("What is your file name? Enter it here: ")

s = set()
with open(file_name) as f:
    for name in f:
        if name.startswith('From:'):
            s.add(name)

print(len(s))