How should one phrase an error message telling a user that only ASCII characters are allowed?

1. How do you encode non ASCII characters in Python?
2. What is the meaning of no special character?

How do you encode non ASCII characters in Python?

In order to use non-ASCII characters, Python requires explicit encoding and decoding of strings into Unicode. In IBM® SPSS® Modeler, Python scripts are assumed to be encoded in UTF-8, which is a standard Unicode encoding that supports non-ASCII characters.

What is the meaning of no special character?

A special character is one that is not considered a number or letter. Symbols, accent marks, and punctuation marks are considered special characters. Similarly, ASCII control characters and formatting characters like paragraph marks are also special characters.