Why This Happens
Accessing a dictionary with dict['key'] raises KeyError if the key is not present. Unlike JavaScript which returns undefined, Python dicts raise an exception.
The Problem
user = {'name': 'Alice', 'email': 'alice@example.com'}
print(user['username'])The Fix
user = {'name': 'Alice', 'email': 'alice@example.com'}
print(user.get('username', 'N/A'))Step-by-Step Fix
- 1
Use .get() with a default
Replace dict['key'] with dict.get('key', default).
- 2
Check key existence
Use 'key' in dict before accessing.
- 3
Inspect the dictionary
Print dict.keys() to see available keys.
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