'''
Purpose: quick refresher on Boolean calculations
'''

# determine whether its input pH level is acidic; i.e., less than 7.0
# non-acidic: >= 7.0

# acidity limit
ACIDIC_THRESHOLD = 7.0     # samples less than threshold are acidic

# get pH level of interest
reply = input( 'Enter pH level: ' )
pH = float( reply )   # we want a decimal because the problem asks for a more precise pH instead of just ints

print( )

# determine whether sample is acidic
is_acidic = ( pH < ACIDIC_THRESHOLD )
# compare the input to our ACIDIC_THRESHOLD
# () helps you order things in the way you want to calculate things
#   you can have more than one operators in an expression, we'll get there
#   sometimes, you want to do some operations first before others that's not left to right
# you don't need () if there's only one logical operation
#   we're using () so we can organize our expression better and helps you prepare for other languages
# if pH is less than 7.0, then is_acidic = True because it is a True relationship
# if pH is greater than or equal to 7.0, then is_acidic = False, because the relationship is False
# when we have variables that hold a boolean truth value, we tend to have a verb in front of the name
#   like is_acidic, has_something...

# other operators include
#   greater than ( > ),
#   greater or equal to ( >= ),
#   less than ( < ),
#   less or equal to ( <= ),
#   equal to ( == )
# also give us back boolean truth values

# print result
print( 'is_acidic =', is_acidic )

# all done