How to Convert String to Literal in Python

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In Python, you often encounter situations where you need to convert a string representation of a literal (like a number or a list) into its corresponding literal value. This process is known as string to literal conversion. Python provides several methods to achieve this. In this guide, we will explore different techniques for converting strings to literals.

Using eval() Function

The eval() function in Python evaluates a string as a Python expression and returns the result. It can be used to convert a string representing a literal into the actual literal value. Here's how you can use eval() for this purpose:

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In this example, the string "42" is converted to an integer using eval(), resulting in the literal value 42.

However, it's important to note that using eval() can be risky, especially if the input string is not sanitized. It can execute arbitrary code, making your program vulnerable to code injection attacks.

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Using Specific Conversion Functions

For specific types of literals, Python provides built-in conversion functions like int(), float(), bool(), and list(). You can use these functions to directly convert strings to their corresponding literal types:

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In these examples, the strings representing floating-point numbers and boolean values are converted to their respective literal types using the appropriate conversion functions.

Using json Module (for JSON Strings)

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Conclusion

Remember to validate and sanitize input strings to ensure the security and integrity of your Python programs.