How Do I Convert a Hexadecimal String to an Integer in Python?

Hexadecimal String to Integer Conversion in Python

Problem:

How can we convert a hexadecimal string representation into an integer value in Python?

Answer:

To convert a hex string to an integer in Python, we can use the int() function. However, we need to consider the presence or absence of the "0x" prefix in the hex string.

Without "0x" Prefix:

If the hex string does not have the "0x" prefix, we need to explicitly specify the base as hexadecimal (base-16) using the second argument of the int() function:

x = int("deadbeef", 16)  # Hex string without "0x" prefix

With "0x" Prefix:

When the hex string has the "0x" prefix, Python can automatically recognize it as a hexadecimal value:

x = int("0xdeadbeef", 0)  # Hex string with "0x" prefix, base=0

Note that the second parameter (base) must be explicitly set to 0 to enable the prefix-guessing behavior of int(). If the base is omitted, int() will default to base-10, assuming the input is a decimal number.

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