[Term Entry] Python binascii-module: .hexlify() (#7894)

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* [Term Entry] Python binascii-module: .hexlify()

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Author: mamtawardhani

content/python/concepts/binascii-module/terms/hexlify/hexlify.md

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+---
+Title: '.hexlify()'
+Description: 'Encodes binary data into a hexadecimal (base-16) representation.'
+Subjects:
+  - 'Code Foundations'
+  - 'Computer Science'
+  - 'Data Science'
+Tags:
+  - 'Encoding'
+  - 'Methods'
+  - 'Modules'
+CatalogContent:
+  - 'learn-python-3'
+  - 'paths/computer-science'
+---
+
+The **`.hexlify()`** method from Python’s [`binascii`](https://www.codecademy.com/resources/docs/python/binascii-module) module encodes binary data into a hexadecimal (base-16) ASCII representation. It’s an alias for `binascii.b2a_hex()` and is commonly used to represent binary data in a readable hex format. Each byte of input data is converted into a two-digit hexadecimal value.
+
+## Syntax
+
+```pseudo
+binascii.hexlify(data[, sep[, bytes_per_sep]])
+```
+
+**Parameters:**
+
+- `data` (bytes-like): The binary data to encode.
+- `sep` (optional, single character `str` or `bytes`): A separator to insert between hex groups.
+- `bytes_per_sep` (optional `int`): After every `bytes_per_sep` input bytes, insert `sep`. A negative value will count from the right end.
+
+**Return value:**
+
+Returns a `bytes` object containing the hexadecimal ASCII representation of the input.
+
+> **Note:** The returned object is always twice as long as the original data. If `sep` is provided, it’s inserted at the specified intervals for better readability.
+
+## Example: Converting Binary Data to Hexadecimal
+
+This example encodes a byte string into its hexadecimal equivalent:
+
+```py
+import binascii
+
+message = b'Python3'
+hex_value = binascii.hexlify(message)
+print(hex_value)
+```
+
+The output of this code is:
+
+```shell
+b'507974686f6e33'
+```
+
+This converts each byte of `'Python3'` into a two-character hexadecimal value, producing a readable byte representation.
+
+## Codebyte Example: Converting to Hexadecimal and Decoding to String
+
+This codebyte demonstrates converting binary data into its hexadecimal representation using `.hexlify()`:
+
+```codebyte/python
+import binascii
+
+# Original binary data
+data = b'OpenAI'
+print("Original data:", data)
+
+# Convert to hexadecimal
+hexed = binascii.hexlify(data)
+print("Hexlified:", hexed)
+
+# Convert to a readable string
+print("Hex as string:", hexed.decode('ascii'))
+```