Question

I am running isympy within emacs shell (emacs 24, debian, snapshot)
I do not have much experience with Python!! The following is driving me nuts:

In [77]: k=0

In [78]: for i in range(3):
   ....: for j in range(3):
   ....:     if i <= j:
   ....:        for l in range(6):
   ....:            J[k,l] = diff(Y[i,j], vars[l])
   ....:        k = k+1
   ....:     else:
   ....:        pass
   ....:     continue
   ....: 

IndentationError: unindent does not match any outer indentation level

(I have tried MANY variations on this!)

I do believe the code is correct, but isympy do not think so!!

¿What is wrong?

Answer 1

The second for-loop needs to be indented from the first, so instead of

In [78]: for i in range(3):
   ....: for j in range(3):

have

In [78]: for i in range(3):
   ....:    for j in range(3):

Also, the

else:
   pass 

doesn’t really do anything and could be deleted. It’s not clear that continue does much here either.

Another frequent culprit is an inadvertent mixture of blanks and tabs. PEP 8 – The Style Guide for Python recommends the use of blanks for indentation over tabs.