python - 在Python中，如何计算电子邮件地址列表中 '1'的数量？

Question

这是我到目前为止所拥有的:

emails = ['<a href="https://stackoverflow.com/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="9ef4fff3fbedafdefbe6fff3eef2fbb0fdf1f3" rel="noreferrer noopener nofollow">[email protected]</a>', '<a href="https://stackoverflow.com/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="c5afa4abb0a9acaba0f4f785afa4abb0a9acaba0eba6aaa8" rel="noreferrer noopener nofollow">[email protected]</a>', '<a href="https://stackoverflow.com/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="2a4c434646435a044745585843596a5a4704494547" rel="noreferrer noopener nofollow">[email protected]</a>',
          '<a href="https://stackoverflow.com/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="3f4d5e467f5d4d5e5b5d4a4d4611504d58" rel="noreferrer noopener nofollow">[email protected]</a>', '<a href="https://stackoverflow.com/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="b4d9d19fcddbc1f4dcdbc0d9d5ddd89ad7dbd9" rel="noreferrer noopener nofollow">[email protected]</a>', '<a href="https://stackoverflow.com/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="4d3e283b28237c7c0d2a202c2421632e2220" rel="noreferrer noopener nofollow">[email protected]</a>',
          '<a href="https://stackoverflow.com/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="3856574a5d48544178554b5c165b5755" rel="noreferrer noopener nofollow">[email protected]</a>', '<a href="https://stackoverflow.com/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="bedddfcccd8acbfecadbcdd2df90ddd1d3" rel="noreferrer noopener nofollow">[email protected]</a>']

def email_security_scan(a, b):
    numbers = []
    for item in a:
        for subitem in item.split():
            if subitem == b:
                numbers.append +=1
    print(numbers)

email_security_scan(emails, 1)

它不起作用，返回[]。

Answer 1

你的逻辑有问题:

• 您正在对没有空格的字符串使用 str.split。无需拆分字符串。
• 您正在比较整数和字符串。这是行不通的。
• 您将追加到列表中，而不是递增计数器变量。

因此，如果您需要计算包含 '1' 的电子邮件地址数量，这将起作用:

def email_security_scan(a, b):
    count = 0
    for item in a:
        if str(b) in item:
            count += 1
    print(count)

email_security_scan(emails, 1)

# 3

更简单地说，您可以将 sum 与生成器表达式一起使用:

def email_security_scan(a, b):
   print(sum(str(b) in item for item in a))

email_security_scan(emails, 1)

# 3

或者要计算所有电子邮件地址中“1”的总数，您可以使用 str.join，然后使用 str.count:

def email_security_scan(a, b):
    print(''.join(a).count(str(b)))

email_security_scan(emails, 1)

# 4