docs: Add Python binascii.crc_hqx() term entry (#7733)

content/python/concepts/binascii-module/terms/crc-hqx/crc-hqx.md

@@ -0,0 +1,76 @@
+---
+Title: '.crc_hqx()'
+Description: 'Computes a 16-bit CRC (CRC-CCITT) checksum of binary data using the CRC-HQX algorithm.'
+Subjects:
+  - 'Computer Science'
+  - 'Data Science'
+Tags:
+  - 'Algorithms'
+  - 'Functions'
+CatalogContent:
+  - 'learn-python-3'
+  - 'paths/computer-science'
+---
+
+The **`.crc_hqx()`** function in Python’s built-in `binascii` module computes a 16-bit Cyclic Redundancy Check (CRC) value using the CRC-HQX algorithm, commonly used in the original Mac OS.
+
+This checksum helps detect errors in data transmission or storage by verifying that the received data matches the original data.
+
+## Syntax
+
+```pseudo
+binascii.crc_hqx(data, value)
+```
+
+**Parameters:**
+
+- `data` (bytes-like object): The binary data for which the CRC value is computed.
+- `value` (integer): An optional 16-bit starting value for the checksum calculation. If omitted, the initial value is `0`.
+
+**Return value:**
+
+Returns a 16-bit integer representing the computed CRC checksum of the input data, according to the CRC-HQX algorithm.
+
+## Example
+
+In this example, the checksum is computed for a byte string, once with a non-zero starting value and once with an initial value of `0`:
+
+```py
+import binascii
+
+data = b"Codecademy Docs"
+initial_crc = 0xAAAA # A common non-zero starting value
+
+# 1. Compute CRC with a starting value (0xAAAA)
+crc_with_initial = binascii.crc_hqx(data, initial_crc)
+
+# 2. Compute CRC starting from 0
+crc_without_initial = binascii.crc_hqx(data, 0)
+
+print(f"Data: {data!r}")
+print(f"CRC (with initial value 0xAAAA): 0x{crc_with_initial:04x}")
+print(f"CRC (starting from 0): 0x{crc_without_initial:04x}")
+```
+
+The output of this code is:
+
+```shell
+Data: b'Codecademy Docs'
+CRC (with initial value 0xAAAA): 0x134c
+CRC (starting from 0): 0x67ce
+```
+
+## Codebyte Example
+
+This example below computes the CRC-HQX checksum for a byte string using a starting value of `0`:
+
+```codebyte/python
+import binascii
+
+data_to_check = b"Python Contributor"
+
+# Calculate the CRC-HQX checksum starting from 0
+checksum = binascii.crc_hqx(data_to_check, 0)
+
+print(f"Checksum: 0x{checksum:04x}")
+```