'''
Purpose: introduce decision making
'''

# determine chrysanthemum color given an input soil pH level
#       acidic soil produces pink chrysanthemums
#   non-acidic soil produces blue chrysanthemums

# acidity threshold

ACIDIC_THRESHOLD = 7.0     # samples less than threshold are acidic

# get soil pH level of interst
reply = input( 'Enter soil pH level: ' )

pH = float( reply )

print( )

# analyze and report effect on chrysanthemums
#   if acidic print 'pink';  otherwise print 'blue'

# keyword if followed by test expression in parentheses and then by a colon.
# if the first test expression evaluates to true the indented code is executed

#color = 'blue'

if ( pH < ACIDIC_THRESHOLD ):
    color = 'pink'
    #print ( 'pink') You can have multiple lines of code underneath and if

# if the  first test expression evaluates to false  and the in the elif test expression evals to true
# the indented code below the elif is executed
elif ( pH == ACIDIC_THRESHOLD ):
    color = 'purple'

#elif (pH > ACIDIC_THRESHOLD): # This works but can lead to missed possibilities
#    color = 'blue'

# if both test expressions evaluate to false the indented code below the else is executed
else: # pH greater than 7.0
    color = 'blue'

# Note: the pattern is if, elif, else; the if must come first and the else must come last
# elif allows for a series of possibilities;

print( color )

# all done