如何用Python循环替换URL中的用户ID并获取接口返回数据？

Hey Todd! Glad you're working on automating this API call. Let's break down how to replace that hardcoded user ID in your URL with a loop that goes through all the IDs you need.

Step 1: Define your list of user IDs #

First, create a list of all the user IDs you want to fetch data for. This could be a static list, or you might load it from a file/database—whatever fits your use case.

Step 2: Use a URL template with dynamic formatting #

Instead of hardcoding the user ID in the URL, turn it into a template where you can plug in each ID dynamically. Python's string formatting options (like f-strings or str.format()) make this clean and straightforward.

Step 3: Loop through each ID and handle API requests #

Wrap your request logic in a loop that iterates over each user ID. We'll also add basic error handling to catch cases where the request fails (like a 404 or network issue) so your script doesn't crash halfway through.

Here's the revised code with all these changes:

import requests
import json

# Step 1: List of user IDs you want to process
user_ids = [12345, 67890, 11223, 44556]  # Add all your target user IDs here

# Step 2: URL template with a placeholder for user_id
url_template = "https://api.abc.com/users/{user_id}?api_key=5632lkjgdlg&_format=_show"

# Step 3: Loop through each user ID to make API calls
for user_id in user_ids:
    try:
        # Replace the placeholder with the current user ID
        current_url = url_template.format(user_id=user_id)
        # Send GET request and parse JSON response
        response = requests.get(current_url)
        response.raise_for_status()  # Trigger error for HTTP status codes like 404/500
        data = response.json()
        
        # Print the full user JSON (formatted for readability)
        print(f"=== User ID {user_id} Data ===")
        print(json.dumps(data['user'], indent=2))
        print("\n")
        
    except requests.exceptions.RequestException as e:
        print(f"Failed to fetch data for user ID {user_id}: {str(e)}")
    except KeyError:
        print(f"User ID {user_id} response doesn't contain a 'user' key")

Key Details to Note: #

• Dynamic URL Construction: Using str.format() makes it explicit which part of the URL is being replaced. Alternatively, you could use an f-string directly: f"https://api.abc.com/users/{user_id}?api_key=..."—both work equally well.
• Error Handling: The try/except blocks handle common issues like network failures, invalid HTTP responses, or missing keys in the JSON response. This keeps your script robust even if some user IDs return errors.
• Readable Output: Adding indent=2 to json.dumps() formats the printed JSON into a human-readable structure instead of a single messy line.

If you need to load user IDs from an external source (like a CSV or text file), feel free to ask—I can add an example for that too!

内容的提问来源于stack exchange，提问作者Todd