Article: Python Hex Function (#1033)

* Create Python-Function-Hex.md

For issue #819

* Update Python-Function-Hex.md

* Update Python-Function-Hex.md

Python-Function-Hex.md

@@ -0,0 +1,23 @@
+# Python hex(x)
+
+`hex(x)` is a built-in function in Python 3 to convert an integer number to a lowercase [hexadecimal](https://www.mathsisfun.com/hexadecimals.html) string prefixed with “0x”.
+
+## Argument
+
+This function takes one argument, `x`, that should be of integer type.
+
+## Return
+
+This function returns a lowercase hexadecimal string prefixed with "0x".
+
+## Example
+
+```python
+print(hex(16))    # prints  0x10
+print(hex(-298))  # prints -0x12a
+print(hex(543))   # prints  0x21f
+```
+
+:rocket: [Run Code](https://repl.it/CV0S)
+
+[Official Documentation](https://docs.python.org/3/library/functions.html#hex)