''' Purpose: considers the subltety of swapping variable values
'''

# get and echo inputs

reply  = input( 'Enter two words: ' )

# Recall that .split() splits the string into a list of words separated at whitespace
# s = 'I am a string'
# list_words = s.split() -> ['I','am','a','string']

# w1 gets the first word in the list and w2 gets the second word in that list ^ (from the split reply)
w1, w2 = reply.split()

print( )
print( 'w1 =', w1 )
print( 'w2 =', w2 )

print()

# swap the values of w1 and w2

# reply is 'CS 1112'
# w1 is 'CS' and w2 is '1112'

# CORRECT SWAPPING
original_w1 = w1 # w3 is a value just to remember the value of w1 so that we don't lose it!
w1 = w2 # w1 is assigned w2's value: '1112'
print( w1 ) # '1112'
w2 = original_w1 # w2 is assigned w1's original value that we remembered/stored in original_w1
print( w2 ) # 'CS'

# We lost w1's value trying to reassign it like this:
# w1 = w2 '1112'
# w2 = w1 '1112'

# print results

# ANOTHER CORRECT SWAPPING

w1, w2 = w2, w1

# The values from the left side are reassigned to the opposite values
# w1 gets w2's value -> '1112'
# w2 gets w1's value -> 'CS'

print( 'After swapping' )

print()

print( 'w1 =', w1 )
print( 'w2 =', w2 )