given a string start index and end index in python code example

Example 1: python string indexof

s = "mouse"
animal_letter = s.find('s')
print animal_letter

Example 2: python string index of

sentence = 'Python programming is fun.'

result = sentence.index('is fun')
print("Substring 'is fun':", result)

result = sentence.index('Java')
print("Substring 'Java':", result)