Configuration File Checker

Write a Python program that reads a configuration file and raises custom exceptions with descriptive messages if required configuration keys are missing.

Example 1:

Input: File contents: {"username": "user1", "password": "password1"} 
Output: "Error: Missing key: 'server'."

Example 2:

Input: File contents: {"username": "user1", "password": "password1", "server": "localhost"} 
Output: "Configuration file checked successfully."

Use the json module to read the configuration file.

import json

def check_config(file):
    required_keys = ["username", "password", "server"]
    with open(file, 'r') as f:
        config = json.load(f)
        for key in required_keys:
            if key not in config:
                raise Exception(f"Error: Missing key: '{key}'.")
        return "Configuration file checked successfully."

print(check_config("config1.json"))  # Output: "Error: Missing key: 'server'."
print(check_config("config2.json"))  # Output: "Configuration file checked successfully."


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