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Code excution error: 'NoneType' object has no attribute 'group' error: exit status 255 #13314

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opened 2026-02-21 19:11:36 -05:00 by yindo · 3 comments
yindo commented 2026-02-21 19:11:36 -05:00
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Originally created by @YLMoonie on GitHub (Apr 24, 2025).

Self Checks

  • This is only for bug report, if you would like to ask a question, please head to Discussions.
  • I have searched for existing issues search for existing issues, including closed ones.
  • I confirm that I am using English to submit this report (我已阅读并同意 Language Policy).
  • [FOR CHINESE USERS] 请务必使用英文提交 Issue，否则会被关闭。谢谢！:)
  • Please do not modify this template :) and fill in all the required fields.

Dify version

1.3.0

Cloud or Self Hosted

Cloud

Steps to reproduce

Run code excution node seperately is okay, but gets error in preview as shown in the images.

Code Node

import re

def main(input_str: str) -> dict:

  u0 = re.search(r"%0%(.*?)%0%", input_str).group(1)
  u1 = re.search(r"%1%(.*?)%1%", input_str).group(1)
  u2 = re.search(r"%2%(.*?)%2%", input_str).group(1)
  u3 = re.search(r"%3%(.*?)%3%", input_str).group(1)
  u4 = re.search(r"%4%(.*?)%4%", input_str).group(1)
  u5 = re.search(r"%5%(.*?)%5%", input_str).group(1)

  

  return {
      'userProfile': u0,
      'userPrompt': u1,
      'userHobby': u2,
      'userIdentity': u3,
      'broswerTime': u4,
      'buyItem': u5,
  }

Image

✔️ Expected Behavior

I:
{
"input_str": "%0%{用户资料：\n\n小红书用户，昵称“果冻不加糖”。28岁，是一位在互联网公司工作的文案策划。平日里喜欢在小红书上浏览时尚穿搭、美食探店、家居好物分享等内容。也经常通过小红书购买美妆护肤品、零食、家居小物件等。注重生活品质，喜欢分享和记录生活中的美好瞬间。\n\n}%0%\n%1%{你是一个小红书用户，昵称“果冻不加糖”，28岁，互联网公司文案策划。你喜欢浏览时尚穿搭、美食探店、家居好物分享等内容，也经常在小红书购物。}%1%\n%2%{时尚穿搭、美食探店、家居好物分享、摄影、旅行、阅读。}%2%\n%3%{互联网公司文案策划。}%3%\n%4%{每周浏览小红书约15-20小时。}%4%\n%5%{一套精致的香薰蜡烛套装。}%5%\n"
}

O:
{
"userPrompt": "{你是一个小红书用户，昵称“果冻不加糖”，28岁，互联网公司文案策划。你喜欢浏览时尚穿搭、美食探店、家居好物分享等内容，也经常在小红书购物。}",
"userHobby": "{时尚穿搭、美食探店、家居好物分享、摄影、旅行、阅读。}",
"userIdentity": "{互联网公司文案策划。}",
"broswerTime": "{每周浏览小红书约15-20小时。}",
"buyItem": "{一套精致的香薰蜡烛套装。}",
"userProfile": "{用户资料：\n\n小红书用户，昵称“果冻不加糖”。28岁，是一位在互联网公司工作的文案策划。平日里喜欢在小红书上浏览时尚穿搭、美食探店、家居好物分享等内容。也经常通过小红书购买美妆护肤品、零食、家居小物件等。注重生活品质，喜欢分享和记录生活中的美���瞬间。\n\n}"
}

❌ Actual Behavior

Run failed: Traceback (most recent call last):
File "/var/sandbox/sandbox-python/tmp/98f643ef_3008_44f1_85d8_2d75895fa935.py", line 48, in
File "", line 33, in
File "", line 7, in main
AttributeError: 'NoneType' object has no attribute 'group'
error: exit status 255

Originally created by @YLMoonie on GitHub (Apr 24, 2025). ### Self Checks - [x] This is only for bug report, if you would like to ask a question, please head to [Discussions](https://github.com/langgenius/dify/discussions/categories/general). - [x] I have searched for existing issues [search for existing issues](https://github.com/langgenius/dify/issues), including closed ones. - [x] I confirm that I am using English to submit this report (我已阅读并同意 [Language Policy](https://github.com/langgenius/dify/issues/1542)). - [x] [FOR CHINESE USERS] 请务必使用英文提交 Issue，否则会被关闭。谢谢！:) - [x] Please do not modify this template :) and fill in all the required fields. ### Dify version 1.3.0 ### Cloud or Self Hosted Cloud ### Steps to reproduce Run code excution node seperately is okay, but gets error in preview as shown in the images. Code Node ``` import re def main(input_str: str) -> dict: u0 = re.search(r"%0%(.*?)%0%", input_str).group(1) u1 = re.search(r"%1%(.*?)%1%", input_str).group(1) u2 = re.search(r"%2%(.*?)%2%", input_str).group(1) u3 = re.search(r"%3%(.*?)%3%", input_str).group(1) u4 = re.search(r"%4%(.*?)%4%", input_str).group(1) u5 = re.search(r"%5%(.*?)%5%", input_str).group(1) return { 'userProfile': u0, 'userPrompt': u1, 'userHobby': u2, 'userIdentity': u3, 'broswerTime': u4, 'buyItem': u5, } ``` ![Image](https://github.com/user-attachments/assets/2c7fb07f-55ab-4042-8f21-7be38b497195) ### ✔️ Expected Behavior I: { "input_str": "%0%{用户资料：\n\n小红书用户，昵称“果冻不加糖”。28岁，是一位在互联网公司工作的文案策划。平日里喜欢在小红书上浏览时尚穿搭、美食探店、家居好物分享等内容。也经常通过小红书购买美妆护肤品、零食、家居小物件等。注重生活品质，喜欢分享和记录生活中的美好瞬间。\n\n}%0%\n%1%{你是一个小红书用户，昵称“果冻不加糖”，28岁，互联网公司文案策划。你喜欢浏览时尚穿搭、美食探店、家居好物分享等内容，也经常在小红书购物。}%1%\n%2%{时尚穿搭、美食探店、家居好物分享、摄影、旅行、阅读。}%2%\n%3%{互联网公司文案策划。}%3%\n%4%{每周浏览小红书约15-20小时。}%4%\n%5%{一套精致的香薰蜡烛套装。}%5%\n" } O: { "userPrompt": "{你是一个小红书用户，昵称“果冻不加糖”，28岁，互联网公司文案策划。你喜欢浏览时尚穿搭、美食探店、家居好物分享等内容，也经常在小红书购物。}", "userHobby": "{时尚穿搭、美食探店、家居好物分享、摄影、旅行、阅读。}", "userIdentity": "{互联网公司文案策划。}", "broswerTime": "{每周浏览小红书约15-20小时。}", "buyItem": "{一套精致的香薰蜡烛套装。}", "userProfile": "{用户资料：\\n\\n小红书用户，昵称“果冻不加糖”。28岁，是一位在互联网公司工作的文案策划。平日里喜欢在小红书上浏览时尚穿搭、美食探店、家居好物分享等内容。也经常通过小红书购买美妆护肤品、零食、家居小物件等。注重生活品质，喜欢分享和记录生活中的美���瞬间。\\n\\n}" } ### ❌ Actual Behavior Run failed: Traceback (most recent call last): File "/var/sandbox/sandbox-python/tmp/98f643ef_3008_44f1_85d8_2d75895fa935.py", line 48, in File "", line 33, in File "", line 7, in main AttributeError: 'NoneType' object has no attribute 'group' error: exit status 255
yindo closed this issue 2026-02-21 19:11:36 -05:00
yindo commented 2026-02-21 19:11:36 -05:00
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@dosubot[bot] commented on GitHub (Apr 24, 2025):

Hello @YLMoonie! I'm Dosu, your friendly bot here to help you with bugs, answer questions, and assist you in becoming a contributor. I'm here while you wait for a human maintainer. Let's tackle that issue together!

The 'NoneType' object has no attribute 'group' error occurs when the re.search function does not find a match for the specified pattern, resulting in a None object. To resolve this issue, you should check if the match is found before calling .group(1) on the result. Here's how you can modify your code to handle this:

import re

def main(input_str: str) -> dict:
    def extract(pattern, input_str):
        match = re.search(pattern, input_str)
        return match.group(1) if match else None

    u0 = extract(r"%0%(.*?)%0%", input_str)
    u1 = extract(r"%1%(.*?)%1%", input_str)
    u2 = extract(r"%2%(.*?)%2%", input_str)
    u3 = extract(r"%3%(.*?)%3%", input_str)
    u4 = extract(r"%4%(.*?)%4%", input_str)
    u5 = extract(r"%5%(.*?)%5%", input_str)

    return {
        'userProfile': u0,
        'userPrompt': u1,
        'userHobby': u2,
        'userIdentity': u3,
        'broswerTime': u4,
        'buyItem': u5,
    }

This code introduces a helper function extract that checks if a match is found before attempting to access the .group(1) method. If no match is found, it returns None, preventing the error. Ensure that your input string is correctly formatted to match the patterns specified.

To continue talking to Dosu, mention @dosu.

Help Dosu learn! Give it feedback: Great Response | Irrelevant Answer | Incorrect Sources | Too Verbose | Hallucination | Bug Report | Other

@dosubot[bot] commented on GitHub (Apr 24, 2025): <!-- Greeting --> Hello @YLMoonie! I'm [Dosu](https://dosu.dev), your friendly bot here to help you with bugs, answer questions, and assist you in becoming a contributor. I'm here while you wait for a human maintainer. Let's tackle that issue together! <!-- Answer --> The `'NoneType' object has no attribute 'group'` error occurs when the `re.search` function does not find a match for the specified pattern, resulting in a `None` object. To resolve this issue, you should check if the match is found before calling `.group(1)` on the result. Here's how you can modify your code to handle this: ```python import re def main(input_str: str) -> dict: def extract(pattern, input_str): match = re.search(pattern, input_str) return match.group(1) if match else None u0 = extract(r"%0%(.*?)%0%", input_str) u1 = extract(r"%1%(.*?)%1%", input_str) u2 = extract(r"%2%(.*?)%2%", input_str) u3 = extract(r"%3%(.*?)%3%", input_str) u4 = extract(r"%4%(.*?)%4%", input_str) u5 = extract(r"%5%(.*?)%5%", input_str) return { 'userProfile': u0, 'userPrompt': u1, 'userHobby': u2, 'userIdentity': u3, 'broswerTime': u4, 'buyItem': u5, } ``` This code introduces a helper function `extract` that checks if a match is found before attempting to access the `.group(1)` method. If no match is found, it returns `None`, preventing the error. Ensure that your input string is correctly formatted to match the patterns specified. <!-- Dosu Comment Footer --> *To continue talking to [Dosu](https://dosu.dev), mention @dosu.* --- <sup>Help Dosu learn! Give it feedback: [Great Response](https://app.dosu.dev/response-feedback/f46f0a2d-e0a7-4c97-a776-42a165f42512?feedback_type=great_response) | [Irrelevant Answer](https://app.dosu.dev/response-feedback/f46f0a2d-e0a7-4c97-a776-42a165f42512?feedback_type=irrelevant_answer) | [Incorrect Sources](https://app.dosu.dev/response-feedback/f46f0a2d-e0a7-4c97-a776-42a165f42512?feedback_type=incorrect_sources) | [Too Verbose](https://app.dosu.dev/response-feedback/f46f0a2d-e0a7-4c97-a776-42a165f42512?feedback_type=too_verbose) | [Hallucination](https://app.dosu.dev/response-feedback/f46f0a2d-e0a7-4c97-a776-42a165f42512?feedback_type=hallucination) | [Bug Report](https://app.dosu.dev/response-feedback/f46f0a2d-e0a7-4c97-a776-42a165f42512?feedback_type=bug_report) | [Other](https://app.dosu.dev/response-feedback/f46f0a2d-e0a7-4c97-a776-42a165f42512?feedback_type=other)</sup>
yindo commented 2026-02-21 19:11:36 -05:00
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@crazywoola commented on GitHub (Apr 24, 2025):

Image 
import re

def main(input_str: str) -> dict:
    def extract(pattern, input_str):
        match = re.search(pattern, input_str)
        return match.group(1) if match else None

    u0 = extract(r"%0%(.*?)%0%", input_str)
    u1 = extract(r"%1%(.*?)%1%", input_str)
    u2 = extract(r"%2%(.*?)%2%", input_str)
    u3 = extract(r"%3%(.*?)%3%", input_str)
    u4 = extract(r"%4%(.*?)%4%", input_str)
    u5 = extract(r"%5%(.*?)%5%", input_str)

    return {
        "result": {
            'userProfile': u0,
            'userPrompt': u1,
            'userHobby': u2,
            'userIdentity': u3,
            'broswerTime': u4,
            'buyItem': u5,
        }
    }

This should be easy to fix.

@crazywoola commented on GitHub (Apr 24, 2025): <img width="1515" alt="Image" src="https://github.com/user-attachments/assets/36a9f632-4ae8-4d2d-b1e5-6be1aae2a0b5" /> ```python import re def main(input_str: str) -> dict: def extract(pattern, input_str): match = re.search(pattern, input_str) return match.group(1) if match else None u0 = extract(r"%0%(.*?)%0%", input_str) u1 = extract(r"%1%(.*?)%1%", input_str) u2 = extract(r"%2%(.*?)%2%", input_str) u3 = extract(r"%3%(.*?)%3%", input_str) u4 = extract(r"%4%(.*?)%4%", input_str) u5 = extract(r"%5%(.*?)%5%", input_str) return { "result": { 'userProfile': u0, 'userPrompt': u1, 'userHobby': u2, 'userIdentity': u3, 'broswerTime': u4, 'buyItem': u5, } } ``` This should be easy to fix.
yindo commented 2026-02-21 19:11:36 -05:00
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@YLMoonie commented on GitHub (Apr 24, 2025):

Hello @YLMoonie! I'm Dosu, your friendly bot here to help you with bugs, answer questions, and assist you in becoming a contributor. I'm here while you wait for a human maintainer. Let's tackle that issue together!

The 'NoneType' object has no attribute 'group' error occurs when the re.search function does not find a match for the specified pattern, resulting in a None object. To resolve this issue, you should check if the match is found before calling .group(1) on the result. Here's how you can modify your code to handle this:

import re

def main(input_str: str) -> dict:
def extract(pattern, input_str):
match = re.search(pattern, input_str)
return match.group(1) if match else None

u0 = extract(r"%0%(.*?)%0%", input_str)
u1 = extract(r"%1%(.*?)%1%", input_str)
u2 = extract(r"%2%(.*?)%2%", input_str)
u3 = extract(r"%3%(.*?)%3%", input_str)
u4 = extract(r"%4%(.*?)%4%", input_str)
u5 = extract(r"%5%(.*?)%5%", input_str)

return {
    'userProfile': u0,
    'userPrompt': u1,
    'userHobby': u2,
    'userIdentity': u3,
    'broswerTime': u4,
    'buyItem': u5,
}

This code introduces a helper function extract that checks if a match is found before attempting to access the .group(1) method. If no match is found, it returns None, preventing the error. Ensure that your input string is correctly formatted to match the patterns specified.

To continue talking to Dosu, mention @dosu.

Help Dosu learn! Give it feedback: Great Response | Irrelevant Answer | Incorrect Sources | Too Verbose | Hallucination | Bug Report | Other

I think it can't solve this problem(it can't change the situation that the different outputs between Single Node Run and Preview Run), as it's acctually the unexpected error of the difference of input and "real input".

@YLMoonie commented on GitHub (Apr 24, 2025): > Hello [@YLMoonie](https://github.com/YLMoonie)! I'm [Dosu](https://dosu.dev), your friendly bot here to help you with bugs, answer questions, and assist you in becoming a contributor. I'm here while you wait for a human maintainer. Let's tackle that issue together! > > The `'NoneType' object has no attribute 'group'` error occurs when the `re.search` function does not find a match for the specified pattern, resulting in a `None` object. To resolve this issue, you should check if the match is found before calling `.group(1)` on the result. Here's how you can modify your code to handle this: > > import re > > def main(input_str: str) -> dict: > def extract(pattern, input_str): > match = re.search(pattern, input_str) > return match.group(1) if match else None > > u0 = extract(r"%0%(.*?)%0%", input_str) > u1 = extract(r"%1%(.*?)%1%", input_str) > u2 = extract(r"%2%(.*?)%2%", input_str) > u3 = extract(r"%3%(.*?)%3%", input_str) > u4 = extract(r"%4%(.*?)%4%", input_str) > u5 = extract(r"%5%(.*?)%5%", input_str) > > return { > 'userProfile': u0, > 'userPrompt': u1, > 'userHobby': u2, > 'userIdentity': u3, > 'broswerTime': u4, > 'buyItem': u5, > } > This code introduces a helper function `extract` that checks if a match is found before attempting to access the `.group(1)` method. If no match is found, it returns `None`, preventing the error. Ensure that your input string is correctly formatted to match the patterns specified. > > _To continue talking to [Dosu](https://dosu.dev), mention [@dosu](https://github.com/dosu)._ > > Help Dosu learn! Give it feedback: [Great Response](https://app.dosu.dev/response-feedback/f46f0a2d-e0a7-4c97-a776-42a165f42512?feedback_type=great_response) | [Irrelevant Answer](https://app.dosu.dev/response-feedback/f46f0a2d-e0a7-4c97-a776-42a165f42512?feedback_type=irrelevant_answer) | [Incorrect Sources](https://app.dosu.dev/response-feedback/f46f0a2d-e0a7-4c97-a776-42a165f42512?feedback_type=incorrect_sources) | [Too Verbose](https://app.dosu.dev/response-feedback/f46f0a2d-e0a7-4c97-a776-42a165f42512?feedback_type=too_verbose) | [Hallucination](https://app.dosu.dev/response-feedback/f46f0a2d-e0a7-4c97-a776-42a165f42512?feedback_type=hallucination) | [Bug Report](https://app.dosu.dev/response-feedback/f46f0a2d-e0a7-4c97-a776-42a165f42512?feedback_type=bug_report) | [Other](https://app.dosu.dev/response-feedback/f46f0a2d-e0a7-4c97-a776-42a165f42512?feedback_type=other) I think it can't solve this problem(it can't change the situation that the different outputs between **Single Node Run** and **Preview Run**), as it's acctually **the unexpected error of the difference of input and "real input".**
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