This Python programming

Write a program that turns a sentence into camel case. The first word is lowercase, the rest of the words have their initial letter capitalized, and all of the words are joined together. For example, with the input "fOnt proCESSOR and ParsER", your program will output "fontProcessorAndParser".

print a warning message if the input will not produce a valid Python variable name. You don't need to be exhaustive in checking, but test for a few common issues, such as starting with a number, or containing invalid characters such as # or + or ".

Test your program, and comment your code.