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Python truth table calculator
from itertools import izip, product, tee
# Logic functions: take and return iterators of truth values
def AND(a, b):
for p, q in izip(a, b):
yield p and q
def OR(a, b):
for p, q in izip(a, b):
yield p or q
def NOT(a):
for p in a:
yield not p
def EQUIV(a, b):
for p, q in izip(a, b):
yield p is q
def IMPLIES(a, b):
for p, q in izip(a, b):
yield (not p) or q
def create(num=2):
''' Returns a list of all of the possible combinations of truth for the given number of variables.
ex. [(T, T), (T, F), (F, T), (F, F)] for two variables '''
return list(product([True, False], repeat=num))
def unpack(data):
''' Regroups the list returned by create() by variable, making it suitable for use in the logic functions.
ex. [(T, T, F, F), (T, F, T, F)] for two variables '''
return [[elem[i] for elem in lst] for i, lst in enumerate(tee(data, len(data[0])))]
def print_result(data, result):
''' Prints the combinations returned by create() and the results returned by the logic functions in a nice format. '''
n = len(data[0])
print headers + "|RESULT"
print '-' * len(headers) + '+------'
for row, result_cell in izip(data, result):
print ''.join({True: 'T', False:'F'}[cell] for cell in row) + '|' + ' ' + {True: 'T', False:'F'}[result_cell]
if __name__ == '__main__':
data = create(num=3)
A, B, C = unpack(data)
result = IMPLIES(A, OR(B, C))
print_result(data, result)
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