Python从文件读取列表：语法与文件格式修正求助

Hey Paul, let's get that hardcoded server list moved to a file so you can scale it easily! I'll walk you through a few simple, reliable methods that should work right away—no more struggling with uncooperative file reads.

Method 1: Simple Text File (Comma-Separated) #

This is the easiest approach, no extra libraries required.

First, create a text file named servers.txt with one server entry per line, separating the domain and tag with a comma:

abc.com,abc
def.com,def
hji.com,hji

Then update your Python code to read this file and build your serverlist:

serverlist = []

# Use a 'with' statement to safely handle file operations (it auto-closes the file)
with open('servers.txt', 'r') as f:
    for line in f:
        # Strip whitespace/newlines and skip empty lines
        cleaned_line = line.strip()
        if not cleaned_line:
            continue
        # Split the line into domain and tag, then add to the list
        domain, tag = cleaned_line.split(',')
        serverlist.append((domain, tag))

# Verify the result matches your original hardcoded list
print(serverlist)

Method 2: CSV File (More Structured) #

If you might expand the data later (or just want a standardized format), use Python's built-in csv module—it handles edge cases like unexpected whitespace automatically.

Create a servers.csv file with the same content as the text file above. Then use this code:

import csv

serverlist = []

with open('servers.csv', 'r') as f:
    # Create a CSV reader to parse the file
    reader = csv.reader(f)
    for row in reader:
        # Ensure each row has exactly two elements before adding
        if len(row) == 2:
            serverlist.append((row[0], row[1]))

print(serverlist)

Method 3: JSON File (Great for Complex Data) #

JSON is perfect if you ever need to add more fields per server (like ports or credentials). First create a servers.json file:

[
    ["abc.com", "abc"],
    ["def.com", "def"],
    ["hji.com", "hji"]
]

Then read it in Python and convert the JSON lists to tuples (to match your original data structure):

import json

with open('servers.json', 'r') as f:
    # Load JSON data and convert each entry to a tuple
    serverlist = [tuple(entry) for entry in json.load(f)]

print(serverlist)

Pro Tips to Avoid Common Headaches #

• File Paths: If your file isn't in the same folder as your script, use the full absolute path (e.g., C:/my_project/servers.txt on Windows or /home/user/my_project/servers.txt on Linux/macOS).
• Error Handling: Add basic checks to catch missing files or malformed lines:

serverlist = []

try:
    with open('servers.txt', 'r') as f:
        for line in f:
            cleaned_line = line.strip()
            if not cleaned_line:
                continue
            parts = cleaned_line.split(',')
            if len(parts) != 2:
                print(f"Skipping invalid line: {cleaned_line}")
                continue
            serverlist.append((parts[0], parts[1]))
except FileNotFoundError:
    print("Oops! Couldn't find the servers.txt file.")
except Exception as e:
    print(f"Something went wrong: {str(e)}")

内容的提问来源于stack exchange，提问作者Paul B