How Can I Safely Convert a String Representation of a Dictionary to a Dictionary in Python?

Converting String Representations of Dictionaries to Dictionaries

In Python, it's often desirable to convert string representations of dictionaries, such as the string representation below, into their corresponding dictionaries:

s = "{'muffin' : 'lolz', 'foo' : 'kitty'}"

Avoid Using 'eval'

While it's possible to use the 'eval' function to evaluate the string expression, this method is discouraged due to security concerns. 'eval' executes any arbitrary code, increasing the risk of vulnerabilities.

Safer Alternatives

To safely convert string dictionaries, consider using the built-in 'ast.literal_eval' function. 'ast.literal_eval' is specifically designed to evaluate literal Python expressions, such as the string representation of dictionaries, tuples, lists, etc.

Example

import ast
ast.literal_eval("{'muffin' : 'lolz', 'foo' : 'kitty'}")

Output:

{'muffin': 'lolz', 'foo': 'kitty'}

Benefits of 'ast.literal_eval'

• Safety: It only evaluates literal expressions, preventing malicious code execution.
• Versatility: It can evaluate not only dictionaries but also lists, tuples, and other Python literal structures.

In comparison to 'eval,' 'ast.literal_eval' provides a safer and more controlled way to convert string representations of dictionaries or other literals into Python objects.

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