python - Check to ensure a string does not contain multiple values

Question

**Note- I will not just be testing at the end of a string-- need to locate particular substrings anywhere in the string

What is the fastest way to check to make sure a string does not contain multiple values. My current method is inefficient and unpythonic:

if string.find('png') ==-1 and sring.find('jpg') ==-1 and string.find('gif') == -1 and string.find('YouTube') == -1:

Answer 1

Try:

if not any(extension in string for extension in ('jpg', 'png', 'gif')):

which is basically the same as your code, but more elegantly written.