Question

Hi guys,why after I run this code, the error message shows "expect the intended error" . the numpigs in the third line is marked
def solve(numlegs, numheads):
for numchicks in range (0, numheads):
numpigs = numheads - numchicks
totlegs = 4*numpigs + 2*numchicks
if totlegs == numlegs:
return (numpigs, numchicks)
return (None,None)

def barnyard():
heads = int(raw_input( 'head:'))
legs = int(raw_input('legs'))
pigs, chickens = solve(heads, legs)
if pigs = None:
print('there is no')
else: print (pigs) print(chickens)

Answer 1

Is this python? I believe you need to indent the code within your for-loop too:
def solve(numlegs, numheads):
for numchicks in range (0, numheads):
numpigs = numheads - numchicks
totlegs = 4*numpigs + 2*numchicks
if totlegs == numlegs:
return (numpigs, numchicks)
return (None,None)

Answer 2

Ehm I believe I misread your for-loop, but you have an indentation problem there :) Whatever is in the loop should be indented.

Answer 3

these two lines need another level of indentation:
numpigs = numheads - numchicks
totlegs = 4*numpigs + 2*numchicks

you also have a nasty bug within the last if statement (can you find it?)

Answer 4

@crz1990
use code pasting sites like pastebin.com etc
it`s easier to read and help

Answer 5

else: print (pigs) print(chickens)

This line has two statements after the else:. If this is Python v2.x, print doesn't have parentheses around the argument, that's Python v3.x.

The code that was posted does have indentation errors.

Answer 6

If you put \(\text{```}\) above and below the code, it also formats it properly... though I only suggest this for small bits of code:

```
def solve(numlegs, numheads):
for numchicks in range (0, numheads):
numpigs = numheads - numchicks
totlegs = 4*numpigs + 2*numchicks
if totlegs == numlegs:
return (numpigs, numchicks)
return (None,None)
```

It turns on the "preformatted block" mode in the message.

Answer 7

@e.mccormick shouldn`t return(None, None) be outside the for loop ?

Answer 8

Probably... I was just showing the ``` block quote system, which means I had to copy and paste code here, which made it collapse, so I had to reformat it. The point was that if they use the block quote, those issues with copy and paste do not happen.