# File: strfind.py
# Find a substring in a string
#
# Matt Bishop, ECS 10, Fall 2012
#
#
instr = input("Enter a string: ")
# put quotes around the string to show its boundaries when it is printed
prstr = '"' + instr + '"'
# get the substring to find
findstr = input("What do you want to find? ")
# put quotes around the string to show its boundaries when it is printed
prfindstr = '"' + findstr + '"'

#
# find the substring
#
# first, -1 on failure
indx = instr.find(findstr)
if (indx == -1):
    print(prfindstr, "does not occur in", prstr)
else:
    print(prfindstr, "first occurs at position", indx, "in", prstr)
indx = instr.rfind(findstr)
if (indx == -1):
    print(prfindstr, "does not occur in", prstr)
else:
    print(prfindstr, "last occurs at position", indx, "in", prstr)

# next, exceptions if it doesn't occur
try:
    indx = instr.index(findstr)
except ValueError as msg:
    print(prfindstr, "does not occur in", prstr, "--", msg)
else:
    print(prfindstr, "first occurs at position", indx, "in", prstr)
try:
    indx = instr.rindex(findstr)
except ValueError as msg:
    print(prfindstr, "does not occur in", prstr, "--", msg)
else:
    print(prfindstr, "last occurs at position", indx, "in", prstr)