Question

@MIT 6.00 Lesson 4, def solve2(numLegs, numHeads) doesn't work on my Python 2.7.2. Any idea? @MIT 6.00 Lesson 4, def solve2(numLegs, numHeads) doesn't work on my Python 2.7.2. Any idea? @MIT 6.00 Intro Co…

Answer 1

Any error messages? What is the output of it? Can you paste your code in codepad, so I can check if you indented it correctly or other minor errors like that? I copied the code verbatim and it worked fine for me.

Answer 2

No error message. Any input will result in "There is no solution."
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def solve2(numLegs, numHeads):
solutionFound = False
for numSpiders in range(0, numHeads + 1):
for numChicks in range(0, numHeads -numSpiders + 1):
numPigs = numHeads - numChicks - numSpiders
totLegs = 4*numPigs + 2*numChicks + 8*numSpiders
if totLegs == numLegs:
print 'Number of pigs: ', str(numPigs)
print 'Number of chickens: ', str(numChicks)
print 'Number of spiders:', str(numSpiders)
solutionFound = True
if not solutionFound: print 'There is no solution.'

Answer 3

My own code of doing same thing, without parameters, works just fine.
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def barn():
""" This lists all possible solutions """
numHeads = int(raw_input('Enter number of heads: '))
numLegs = int(raw_input('Enter number of legs: '))
count = 0
for numSpiders in range(0, numHeads + 1):
for numChicks in range(0, numHeads -numSpiders + 1):
numPigs = numHeads - numChicks - numSpiders
totLegs = 4*numPigs + 2*numChicks + 8*numSpiders
if totLegs == numLegs:
count = count + 1
print 'Number', str(count), 'of pigs:', numPigs
print 'Number', str(count), 'of chickens:', numChicks
print 'Number', str(count), 'of spiders:', numSpiders
if count == 0: print 'There is no solution'

Answer 4

Anybody, any clues?

Answer 5

I just copy and pasted your code that wasn't working and it did work for me. Are you trying correct inputs? That's awkward.

Answer 6

You're right, I was making a really stupid mistake, I was always putting in numbers like (10,20)/(numHeads, numLegs) instead of (20,10)/(numLegs, numHeads).

Many thanks, bmp!