Python 2.7：如何将循环输出存入变量并用于邮件发送？

Got it, let's break this down for you. You're working with variable-length repeated JSON blocks, using a loop to process them—but right now you're just printing the output. You want to capture all that into a variable so you can use it flexibly for emails, right? Here's exactly how to do that:

1. 核心思路：用容器收集循环内容 #

Instead of printing each line directly, build up a string (or list of strings) as you loop through your JSON blocks. This gives you a single, reusable variable you can plug straight into your email body later.

示例1：字符串拼接（适合简单内容场景） #

假设你已经有了处理JSON块的逻辑，只需调整输出方式：

import json

# 模拟你的不定长重复JSON块
json_blocks = [
    {"ticket_id": 101, "status": "resolved", "user": "Alice"},
    {"ticket_id": 102, "status": "pending", "user": "Bob"},
    # 更多动态生成的块...
]

# 初始化空字符串存储最终内容
email_content = ""

for block in json_blocks:
    # 提取并格式化你需要的信息
    line = f"- Ticket #{block['ticket_id']}: {block['user']}'s request is {block['status']}\n"
    # 把每一行追加到变量中
    email_content += line

# 现在email_content就是所有循环输出的整合内容，直接用于邮件即可
print(email_content)

示例2：列表收集后合并（高效处理大量内容） #

字符串拼接在循环中如果数据量较大，效率会偏低。用列表先收集每一行，最后合并成字符串更优：

email_lines = []

for block in json_blocks:
    line = f"- Ticket #{block['ticket_id']}: {block['user']}'s request is {block['status']}\n"
    email_lines.append(line)

# 把列表中的所有行合并为一个完整字符串
email_content = "".join(email_lines)

2. 复杂JSON块的适配技巧 #

如果你的JSON块有嵌套结构，只需在循环里调整信息提取逻辑就行，比如：

for block in json_blocks:
    user_name = block["customer"]["name"]
    order_date = block["order"]["created_at"]
    product = block["order"]["items"][0]["name"]
    line = f"- {user_name} ordered {product} on {order_date}\n"
    email_lines.append(line)

3. 邮件格式优化（HTML版） #

如果你的邮件需要更美观的HTML格式，可以直接把内容格式化为HTML标签：

email_lines = ["<ul>"]
for block in json_blocks:
    line = f"<li>Ticket #{block['ticket_id']}: {block['user']}'s request is <strong>{block['status']}</strong></li>"
    email_lines.append(line)
email_lines.append("</ul>")

# 生成HTML格式的邮件内容
html_email_content = "\n".join(email_lines)

这样html_email_content就能直接作为邮件的HTML正文使用。

内容的提问来源于stack exchange，提问作者UsualSuspect7