''' Purpose: deepen variable manipulation understanding
'''

# first generation
generation  = 1
nbr_rabbits = 2

#generation  = generation + 1
#nbr_rabbits = nbr_rabbits * 2 # Any red stuff is usually a syntax error, but can be other kinds of error like this traceback error.

print( 'Generation: ', generation  ) # An identifier ends when it sees a character that is not a letter or a number.
print( 'Rabbits:    ', nbr_rabbits ) # Identifiers in good looking code end in a space.

input()

# next generation
generation  = generation + 1 # Python evaluates the right side of the equals sign first. Right associative
nbr_rabbits = nbr_rabbits * 2 # This works because = assigns in programming. It is not the traditional algebraic equals.

print( 'Generation: ', generation  )
print( 'Rabbits:    ', nbr_rabbits )

input()

# next generation
generation  = generation + 1 # You could do this faster, but you haven't learned it yet. We will get there. :)
nbr_rabbits = nbr_rabbits * 2

print( 'Generation: ', generation  )
print( 'Rabbits:    ', nbr_rabbits )

input()

# next generation
generation  = generation + 1
nbr_rabbits = nbr_rabbits * 2

print( 'Generation: ', generation  )
print( 'Rabbits:    ', nbr_rabbits )

input()

# next generation
generation  = generation + 1
nbr_rabbits = nbr_rabbits * 2

print( 'Generation: ', generation  )
print( 'Rabbits:    ', nbr_rabbits )

input()

# Whats in the bottom window is a description of the output.
#  It does not necessarily have the same number of lines as the actual program.