pset6 similarities more …object does not support item assignment
I'm stuck with pset6 similarities more. When I want to insert the tuples into my matrix, I keep getting the message 'NoneType' object does not support item assignment. If I change none to 0 or to (None, None), I get the same message : int/tuple object does not support item assignment. What am I overlooking?
def distances(a, b):
"""Calculate edit distance from a to b"""
# create matrix of dimensions len(a) + 1 and len(b) + 1 and fill with zeros
matrix = [[None for i in range(len(b) + 1)] for j in range(len(a) + 1)]
matrix[0][0] = (0, None)
for x in range (1, len(a) + 1):
matrix[x][0] = (x, Operation.INSERTED)
for y in range (1, len(b) + 1):
matrix[0][y] = (y, Operation.DELETED)
for x in range(1, len(a) + 1):
for y in range(1, len(b) + 1):
if a[x - 1] == b[y - 1]:
matrix[x][y] = (min(matrix[x - 1][y - 1][0], matrix[x][y - 1][0], matrix[x - 1][y][0]), None)
else:
matrix[x][y][0] = min(matrix[x - 1][y - 1][0] + 1, matrix[x][y - 1][0] + 1, matrix[x - 1][y][0] + 1)
if matrix[x][y][0] == matrix[x - 1][y - 1][0] + 1:
matrix[x][y][1] = Operation.SUBSTITUTED
if matrix[x][y][0] == matrix[x][y - 1][0] + 1:
matrix[x][y][1] = Operation.INSERTED
else:
matrix[x][y][1] = Operation.DELETED
return matrix
python
asked Nov 15 '18 at 2:21
IdaIda
135
add a comment |
I'm stuck with pset6 similarities more. When I want to insert the tuples into my matrix, I keep getting the message 'NoneType' object does not support item assignment. If I change none to 0 or to (None, None), I get the same message : int/tuple object does not support item assignment. What am I overlooking?
def distances(a, b):
"""Calculate edit distance from a to b"""
# create matrix of dimensions len(a) + 1 and len(b) + 1 and fill with zeros
matrix = [[None for i in range(len(b) + 1)] for j in range(len(a) + 1)]
matrix[0][0] = (0, None)
for x in range (1, len(a) + 1):
matrix[x][0] = (x, Operation.INSERTED)
for y in range (1, len(b) + 1):
matrix[0][y] = (y, Operation.DELETED)
for x in range(1, len(a) + 1):
for y in range(1, len(b) + 1):
if a[x - 1] == b[y - 1]:
matrix[x][y] = (min(matrix[x - 1][y - 1][0], matrix[x][y - 1][0], matrix[x - 1][y][0]), None)
else:
matrix[x][y][0] = min(matrix[x - 1][y - 1][0] + 1, matrix[x][y - 1][0] + 1, matrix[x - 1][y][0] + 1)
if matrix[x][y][0] == matrix[x - 1][y - 1][0] + 1:
matrix[x][y][1] = Operation.SUBSTITUTED
if matrix[x][y][0] == matrix[x][y - 1][0] + 1:
matrix[x][y][1] = Operation.INSERTED
else:
matrix[x][y][1] = Operation.DELETED
return matrix
python
asked Nov 15 '18 at 2:21
IdaIda
135
as the error suggests, tuples can't be changed in-place, but they can be overlaid by new tuples. try creating a new tuple and assigning it tomatrix[x][y], rather than assigning the tuple elements themselves
– Garrett
Nov 15 '18 at 5:38
Thanks, it worked!
– Ida
Nov 15 '18 at 19:26
great! I converted my comment to an answer. If you're happy with it, accepting the answer will make the question appear resolved.
– Garrett
Nov 15 '18 at 21:19
add a comment |
I'm stuck with pset6 similarities more. When I want to insert the tuples into my matrix, I keep getting the message 'NoneType' object does not support item assignment. If I change none to 0 or to (None, None), I get the same message : int/tuple object does not support item assignment. What am I overlooking?
def distances(a, b):
"""Calculate edit distance from a to b"""
# create matrix of dimensions len(a) + 1 and len(b) + 1 and fill with zeros
matrix = [[None for i in range(len(b) + 1)] for j in range(len(a) + 1)]
matrix[0][0] = (0, None)
for x in range (1, len(a) + 1):
matrix[x][0] = (x, Operation.INSERTED)
for y in range (1, len(b) + 1):
matrix[0][y] = (y, Operation.DELETED)
for x in range(1, len(a) + 1):
for y in range(1, len(b) + 1):
if a[x - 1] == b[y - 1]:
matrix[x][y] = (min(matrix[x - 1][y - 1][0], matrix[x][y - 1][0], matrix[x - 1][y][0]), None)
else:
matrix[x][y][0] = min(matrix[x - 1][y - 1][0] + 1, matrix[x][y - 1][0] + 1, matrix[x - 1][y][0] + 1)
if matrix[x][y][0] == matrix[x - 1][y - 1][0] + 1:
matrix[x][y][1] = Operation.SUBSTITUTED
if matrix[x][y][0] == matrix[x][y - 1][0] + 1:
matrix[x][y][1] = Operation.INSERTED
else:
matrix[x][y][1] = Operation.DELETED
return matrix
python
asked Nov 15 '18 at 2:21
IdaIda
135
I'm stuck with pset6 similarities more. When I want to insert the tuples into my matrix, I keep getting the message 'NoneType' object does not support item assignment. If I change none to 0 or to (None, None), I get the same message : int/tuple object does not support item assignment. What am I overlooking?
def distances(a, b):
"""Calculate edit distance from a to b"""
# create matrix of dimensions len(a) + 1 and len(b) + 1 and fill with zeros
matrix = [[None for i in range(len(b) + 1)] for j in range(len(a) + 1)]
matrix[0][0] = (0, None)
for x in range (1, len(a) + 1):
matrix[x][0] = (x, Operation.INSERTED)
for y in range (1, len(b) + 1):
matrix[0][y] = (y, Operation.DELETED)
for x in range(1, len(a) + 1):
for y in range(1, len(b) + 1):
if a[x - 1] == b[y - 1]:
matrix[x][y] = (min(matrix[x - 1][y - 1][0], matrix[x][y - 1][0], matrix[x - 1][y][0]), None)
else:
matrix[x][y][0] = min(matrix[x - 1][y - 1][0] + 1, matrix[x][y - 1][0] + 1, matrix[x - 1][y][0] + 1)
if matrix[x][y][0] == matrix[x - 1][y - 1][0] + 1:
matrix[x][y][1] = Operation.SUBSTITUTED
if matrix[x][y][0] == matrix[x][y - 1][0] + 1:
matrix[x][y][1] = Operation.INSERTED
else:
matrix[x][y][1] = Operation.DELETED
return matrix
python
python
asked Nov 15 '18 at 2:21
IdaIda
135
asked Nov 15 '18 at 2:21
IdaIda
135
edited Nov 15 '18 at 19:26
Ida
asked Nov 15 '18 at 2:21
IdaIda
135
asked Nov 15 '18 at 2:21
IdaIda
135
asked Nov 15 '18 at 2:21
IdaIda
135
135
as the error suggests, tuples can't be changed in-place, but they can be overlaid by new tuples. try creating a new tuple and assigning it tomatrix[x][y], rather than assigning the tuple elements themselves
– Garrett
Nov 15 '18 at 5:38
Thanks, it worked!
– Ida
Nov 15 '18 at 19:26
great! I converted my comment to an answer. If you're happy with it, accepting the answer will make the question appear resolved.
– Garrett
Nov 15 '18 at 21:19
add a comment |
as the error suggests, tuples can't be changed in-place, but they can be overlaid by new tuples. try creating a new tuple and assigning it tomatrix[x][y], rather than assigning the tuple elements themselves
– Garrett
Nov 15 '18 at 5:38
Thanks, it worked!
– Ida
Nov 15 '18 at 19:26
great! I converted my comment to an answer. If you're happy with it, accepting the answer will make the question appear resolved.
– Garrett
Nov 15 '18 at 21:19
as the error suggests, tuples can't be changed in-place, but they can be overlaid by new tuples. try creating a new tuple and assigning it to
matrix[x][y], rather than assigning the tuple elements themselves– Garrett
Nov 15 '18 at 5:38
as the error suggests, tuples can't be changed in-place, but they can be overlaid by new tuples. try creating a new tuple and assigning it to
matrix[x][y], rather than assigning the tuple elements themselves– Garrett
Nov 15 '18 at 5:38
Thanks, it worked!
– Ida
Nov 15 '18 at 19:26
Thanks, it worked!
– Ida
Nov 15 '18 at 19:26
great! I converted my comment to an answer. If you're happy with it, accepting the answer will make the question appear resolved.
– Garrett
Nov 15 '18 at 21:19
great! I converted my comment to an answer. If you're happy with it, accepting the answer will make the question appear resolved.
– Garrett
Nov 15 '18 at 21:19
add a comment |
1 Answer
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The tuple object does not support item assignment error message means Python tuples can't be changed in-place, but they can be overlaid by new tuples. Try creating a new tuple and assigning it to matrix[x][y], rather than assigning the tuple elements themselves.
answered Nov 15 '18 at 21:17
GarrettGarrett
22.1k34544
add a comment |
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The tuple object does not support item assignment error message means Python tuples can't be changed in-place, but they can be overlaid by new tuples. Try creating a new tuple and assigning it to matrix[x][y], rather than assigning the tuple elements themselves.
answered Nov 15 '18 at 21:17
GarrettGarrett
22.1k34544
add a comment |
The tuple object does not support item assignment error message means Python tuples can't be changed in-place, but they can be overlaid by new tuples. Try creating a new tuple and assigning it to matrix[x][y], rather than assigning the tuple elements themselves.
answered Nov 15 '18 at 21:17
GarrettGarrett
22.1k34544
add a comment |
The tuple object does not support item assignment error message means Python tuples can't be changed in-place, but they can be overlaid by new tuples. Try creating a new tuple and assigning it to matrix[x][y], rather than assigning the tuple elements themselves.
answered Nov 15 '18 at 21:17
GarrettGarrett
22.1k34544
The tuple object does not support item assignment error message means Python tuples can't be changed in-place, but they can be overlaid by new tuples. Try creating a new tuple and assigning it to matrix[x][y], rather than assigning the tuple elements themselves.
answered Nov 15 '18 at 21:17
GarrettGarrett
22.1k34544
answered Nov 15 '18 at 21:17
GarrettGarrett
22.1k34544
answered Nov 15 '18 at 21:17
GarrettGarrett
22.1k34544
answered Nov 15 '18 at 21:17
GarrettGarrett
22.1k34544
22.1k34544
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as the error suggests, tuples can't be changed in-place, but they can be overlaid by new tuples. try creating a new tuple and assigning it to
matrix[x][y], rather than assigning the tuple elements themselves– Garrett
Nov 15 '18 at 5:38
Thanks, it worked!
– Ida
Nov 15 '18 at 19:26
great! I converted my comment to an answer. If you're happy with it, accepting the answer will make the question appear resolved.
– Garrett
Nov 15 '18 at 21:19