''' Purpose: introduce the logical operators
'''

print()

print( '##### Logical values (bool)' )

print()

# True and False are boolean values (a boolean is a new type in Python)
# The same way lists, strings, ints are types, so are booleans.

print( True )
print( False )

print(); input( 'Enter when ready: ' ); print()

print( '##### Logical and' )

a = True
b = False

print()

and1 = ( a and a )
and2 = ( a and b )
and3 = ( b and a )
and4 = ( b and b )

print( a, 'and', a, '=',  and1 )
print( a, 'and', b, '=',  and2 )
print( b, 'and', a, '=',  and3 )
print( b, 'and', b, '=',  and4 )

print(); input( 'Enter when ready: ' ); print()

print()

print( '##### Logical or' )

print()

or1 = ( a or a )
or2 = ( a or b )
or3 = ( b or a )
or4 = ( b or b )

print( a, 'or', a, '=',  or1 )
print( a, 'or', b, '=',  or2 )
print( b, 'or', a, '=',  or3 )
print( b, 'or', b, '=',  or4 )

print(); input( 'Enter when ready: ' ); print()

print( '##### Logical negation' )

print()

negate1 = ( not a )
negate2 = ( not b )

print( 'not', a, '=',  negate1 )
print( 'not', b, '=',  negate2 )

print(); input( 'Enter when ready: ' ); print()

print( '##### Logical inclusion' )

print()

x = [ 3, 1, 4, 1, 5 ]
i = 1
j = 2

has1 = ( i in x )
has2 = ( j in x )

print( i, 'in', x, '=',  has1 )
print( j, 'in', x, '=',  has2 )

print(); input( 'Enter when ready: ' ); print()

print( '##### Logical exclusion' )

print()

x = [ 3, 1, 4, 1, 5 ]
i = 1
j = 2

doesnot1 = ( i not in x )
doesnot2 = ( j not in x )

print( i, 'not in', x, '=',  doesnot1 )
print( j, 'not in', x, '=',  doesnot2 )

# Logical Operators
    # and - both things must be true to be true (otherwise result is false)
    # or - both things must be false to be false (otherwise result is true)
    # not - opposite of true/false result
    # in - see if something is in a sequence (like a character in a string / element in a list)
    # not in - see if something isn't in a sequence (like a character in a string / element in a list)

# Relational operators
    # > greater than
    # < less than
    # >= greater than or equal to
    # <= less than or equal to
    # == equal to
    # != not equal to (different)