Python函数输出捕获：理解NoneType与库行为

from GmailChecker import GmailChecker

def checker_original():
    email = 'test@example.com' # 替换为实际邮箱
    checker_result = GmailChecker.verify(email, 1)
    try:
        if 'Unregistered' in checker_result:
            print('False')
        else:
            print('Alive')
    except TypeError as e:
        print(f'Error occurred: {e}')

checker_original()

from GmailChecker import GmailChecker

def verify_return_value():
    email = 'test@example.com' # 替换为实际邮箱
    print("GmailChecker.verify() will print its status directly.")
    result = GmailChecker.verify(email, 1) # 这会直接打印状态
    print(f"The actual return value of GmailChecker.verify() is: {result}")

verify_return_value()

from GmailChecker import GmailChecker

def gmail_checker_corrected():
    email = 'test@example.com' # 替换为实际邮箱
    # GmailChecker.verify() 会直接将检查结果打印到控制台
    GmailChecker.verify(email, 1)
    # 如果需要，可以返回一个完成消息
    return f"Finished checking {email}."

# 调用函数，并打印其返回的完成消息
# 实际的邮箱状态会由 GmailChecker.verify() 直接打印
print(gmail_checker_corrected())

test@example.com Unregistered
Finished checking test@example.com.

import sys
import io
from GmailChecker import GmailChecker

def capture_printed_output(email):
    # 保存原始的标准输出
    original_stdout = sys.stdout
    # 创建一个字符串IO对象来捕获输出
    captured_output = io.StringIO()
    # 将标准输出重定向到我们的字符串IO对象
    sys.stdout = captured_output

    try:
        # 调用会打印内容的函数
        GmailChecker.verify(email, 1)
    finally:
        # 无论如何，确保将标准输出恢复到原始状态
        sys.stdout = original_stdout

    # 获取捕获到的字符串内容
    return captured_output.getvalue()

# 示例使用
email_to_check = 'test@example.com' # 替换为实际邮箱
output_string = capture_printed_output(email_to_check)
print(f"Captured output: '{output_string.strip()}'")

if 'Unregistered' in output_string:
    print(f"Email {email_to_check} is Unregistered.")
else:
    print(f"Email {email_to_check} status is not 'Unregistered' (or is Alive/other).")