s = "Hello Python!"

print(s.find('H'))
# output: 0

# if more than one occurance, return the first index
print(s.find('o'))
# output : 4

# we can search from the end instead of the beginning
print(s.rfind('o'))
# output : 10

# or we can start searching from a particular location
print(s.find('o', 5))  # start searching from index 5, i.e. the whitespace
# output : 10

# search substring
print(s.find('Pyt'))
# output : 6

# if not found
print(s.find('x'))
# output : -1