s22.py

s1="HelloWorld!"
#Returns lowest index
print (s1.find("o"))#Output:4
print (s1.index("o"))#Output:4
#Returns highest index
print (s1.rfind("o"))#Output:6
print (s1.rindex("o"))#Output:6


#When substring is not found
#Returns -1
print (s1.find("z"))#Output:-1
print (s1.rfind("z"))#Output:-1
#Raises ValueError
#print (s1.index("z"))#Output:ValueError: substring not found
#print (s1.rindex("z"))#Output:ValueError: substring not found


#start and end index is mentioned
print (s1.find("o",3,5))#Output:4
print (s1.rfind("o",3,5))#Output:4
print (s1.index("o",3,5))#Output:4
print (s1.rindex("o",3,5))#Output:4