如何用Python3的requests库发送含图片与文本的MultipartForm请求？

To replicate your Node.js multipart POST request in Python using the requests library, here's a straightforward, equivalent implementation:

Step 1: Import Required Libraries #

Start by importing the necessary modules for HTTP requests and JSON serialization:

import requests
import json

Step 2: Define Variables and Helper Logic #

Recreate your original variables and the RequestData function (adjust the function body to match your Node.js logic):

file_path = "xxx.jpeg"
text = "xxx"
api_url = "http://xxx"

def request_data(text_input):
    # Replace this with your actual RequestData implementation from Node.js
    return {"text_content": text_input}

Step 3: Prepare Multipart Form Data #

Use a list of tuples to construct your multipart parts—this preserves the order of parts (matching your Node.js code) and supports custom content types:

# Add your authorization header (replace with real credentials/token)
headers = {
    "Authorization": "YourAuthTokenOrCredentialsHere"
}

# Safely handle the image file with a `with` block to avoid resource leaks
with open(file_path, "rb") as image_file:
    multipart_parts = [
        # Image part: matches Node.js's Content-Disposition and Content-Type
        ("file", (file_path, image_file, "image/jpeg")),
        # JSON payload part: custom content type, no filename needed
        ("payload", (None, json.dumps(request_data(text)), "application/specified-content-type-xxx"))
    ]
    
    # Send the POST request
    response = requests.post(api_url, files=multipart_parts, headers=headers)

Step 4: Process the Response #

Handle the API response based on your needs:

# Check request success
print(f"Status Code: {response.status_code}")

# Parse JSON response if applicable
try:
    response_json = response.json()
    print("Response Data:", response_json)
except ValueError:
    print("Non-JSON Response:", response.text)

Key Details to Note: #

• Part Order: Using a list ensures the image is sent first, followed by the JSON payload—this matches your Node.js code and may be required by the API.
• Custom Content Type: The JSON part uses None as the filename (since it's not a file) and explicitly sets your custom content type.
• File Safety: The with statement automatically closes the image file after the request completes.
• Authorization: Don't forget to replace the placeholder in the headers dictionary with your actual authorization token or credentials.

If your original Node.js code specified a different name for the JSON payload in Content-Disposition (it wasn't included in your snippet), replace "payload" in the second tuple with that name.

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