Please use simple code in python to solve the question!

Write a function is_nneg_float() that checks if string s denotes a non-negative floating point value (not in scientific notation). This function should return True if s contains (at most) one decimal point and one or more digits (and nothing else); and False otherwise. According to this definition an integer should return True.

>>> is_nneg_float("2.15")

True

>>> is_nneg_float("3.")

True

>>> is_nneg_float(".5")

True

>>> is_nneg_float("123")

True

>>> is_nneg_float("-12")

False

>>> is_nneg_float("1e10")

False