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def printmatriz(lista):
    for a in lista:
        for b in a:
            print('{:<5}'.format(b), end=' ')
        print()
    print('--'*20)
 
 
#Programa principal
a = [[2, 3],
     [4, 6]
]
 
b = [[1, 3, 0],
     [2, 1, 1]
]
 
r = []
rLinhas = len(a)
rColunas = len(b[0])
 
for l in range(rLinhas):
    r.append([])
    for c in range(rColunas):
        val = 
        r[-1].append(val)
 
print('Matriz normal')
printmatriz(a)
print('Matriz multiplicada por {}'.format(m))
printmatriz(r)
 

Traceback (most recent call last):
  File "/usr/lib/python3.5/py_compile.py", line 125, in compile
    _optimize=optimize)
  File "<frozen importlib._bootstrap_external>", line 735, in source_to_code
  File "<frozen importlib._bootstrap>", line 222, in _call_with_frames_removed
  File "./prog.py", line 25
    val = 
         ^
SyntaxError: invalid syntax

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib/python3.5/py_compile.py", line 129, in compile
    raise py_exc
py_compile.PyCompileError:   File "./prog.py", line 25
    val =
         ^
SyntaxError: invalid syntax

Standard output is empty