''' Purpose: continue string manipulation introduction
'''

print()

# Operator [] is the string index operator -- it provides access to
# a string subsequence. Depending upon its operands it is all called
# subscripting and slicing. Here we only care about subscripting.
# The subscript is an index value. In Python index values start at 0.

print( "### [] is the string index operator" )
s = "obliviator"

n = len( s )

print( "s =", s, )
print( "    0123456789" )

print()

print( "n = len( s ) =", n )

print()

# Remember this!! Indexes start at 0!
# The last index is the length of the sequence - 1
# 10 characters in your string? the first letter is at index
# 0 and the last character is at index (len(string)- 1) so at index 9
# If we tell you to find the last character in a string,
# do NOT do s[len(s)] or s[n] if n = len(s)

# TAKEAWAY: FIRST CHARACTER AT INDEX 0 LAST CHARACTER AT INDEX len(s)-1
# where s is a string.

# s = "1112"
# s[0] = '1' s[1] = '1' s[2] = '1' s[3] = '2'
# s = "CS 1112" with a space!
# s[0] = 'C' s[1] = 'S' s[2] = ' ' s[3] = '1' s[4] = '1' s[5] = '1' s[6] = '2'
print( "### If the [] operand is an integer value, it is subscripting" )
x = s[ 0 ]
y = s[ 4 ]
z = s[ n-1 ]

print( "s[ 0 ] = ", x )
print( "s[ 4 ] = ", y )
print( "s[ n-1 ] = ", z )