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TypeError: “unsupported operand type(s) for /: 'int' and 'list'” in QGIS?
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In a academic project I've produced a small python script for watershed analysis. This script relates shapefiles attributes and generates a .txt file.
I am trying to adjust the script to use within the QGIS environment. When I use it, it shows the following error:
unsupported operand type (s) for /: 'int' and 'list' See log for more details
In logs we can see:
2019-01-03T21:10:57 2 Uncaught error while executing algorithm
Traceback (most recent call last):
File "C:/PROGRA~1/QGIS2~1.18/apps/qgis-ltr/./python/pluginsprocessingcoreGeoAlgorithm.py", line 203, in execute
self.processAlgorithm(progress)
File "C:/PROGRA~1/QGIS2~1.18/apps/qgis-ltr/./python/pluginsprocessingscriptScriptAlgorithm.py", line 381, in processAlgorithm
exec((script), ns)
File "<string>", line 123, in <module>
File "<string>", line 35, in densidade_rios
TypeError: unsupported operand type(s) for /: 'int' and 'list'
Here is the code:
from qgis.core import *
import math
# Function
def densidade_rios(valor_total_rios, valor_area_bacia):
dr = valor_total_rios / valor_area_bacia
return dr
# Loading dreinage and watershed layers
dlayer = QgsVectorLayer(Drenagem, "drenagem", "ogr")
blayer = QgsVectorLayer(Bacia, "bacia", "ogr")
# Dreinage attributes
dfeatures = dlayer.getFeatures()
# Listing values per column
listdfeatures = list(zip(*dfeatures))
# Max and min order values
maxordem = max(listdfeatures[0])
minordem = min(listdfeatures[0])
# Counting features of channel hierarchy (dreinage layer values)
ordem = minordem
hierarquia = []
while (ordem <= maxordem):
contagem = listdfeatures[0].count(ordem)
hierarquia.append(contagem)
ordem += 1
# Total of rivers - quantity of first order rivers (dreinage layer values)
totalrios = hierarquia[0]
# Watershed attributes
areabh = blayer.getValues(blayer.fields()[0].name())[0]
# Using function
dr = densidade_rios(totalrios, areabh)
Attribute table values of drenagem layer:
Attribute table values of bacia layer:
qgis python pyqgis vector typeerror
edited 9 mins ago
Andre Silva
7,735113785
asked Jan 4 at 0:18
CarolinaCarolina
288
add a comment |
In a academic project I've produced a small python script for watershed analysis. This script relates shapefiles attributes and generates a .txt file.
I am trying to adjust the script to use within the QGIS environment. When I use it, it shows the following error:
unsupported operand type (s) for /: 'int' and 'list' See log for more details
In logs we can see:
2019-01-03T21:10:57 2 Uncaught error while executing algorithm
Traceback (most recent call last):
File "C:/PROGRA~1/QGIS2~1.18/apps/qgis-ltr/./python/pluginsprocessingcoreGeoAlgorithm.py", line 203, in execute
self.processAlgorithm(progress)
File "C:/PROGRA~1/QGIS2~1.18/apps/qgis-ltr/./python/pluginsprocessingscriptScriptAlgorithm.py", line 381, in processAlgorithm
exec((script), ns)
File "<string>", line 123, in <module>
File "<string>", line 35, in densidade_rios
TypeError: unsupported operand type(s) for /: 'int' and 'list'
Here is the code:
from qgis.core import *
import math
# Function
def densidade_rios(valor_total_rios, valor_area_bacia):
dr = valor_total_rios / valor_area_bacia
return dr
# Loading dreinage and watershed layers
dlayer = QgsVectorLayer(Drenagem, "drenagem", "ogr")
blayer = QgsVectorLayer(Bacia, "bacia", "ogr")
# Dreinage attributes
dfeatures = dlayer.getFeatures()
# Listing values per column
listdfeatures = list(zip(*dfeatures))
# Max and min order values
maxordem = max(listdfeatures[0])
minordem = min(listdfeatures[0])
# Counting features of channel hierarchy (dreinage layer values)
ordem = minordem
hierarquia = []
while (ordem <= maxordem):
contagem = listdfeatures[0].count(ordem)
hierarquia.append(contagem)
ordem += 1
# Total of rivers - quantity of first order rivers (dreinage layer values)
totalrios = hierarquia[0]
# Watershed attributes
areabh = blayer.getValues(blayer.fields()[0].name())[0]
# Using function
dr = densidade_rios(totalrios, areabh)
Attribute table values of drenagem layer:
Attribute table values of bacia layer:
qgis python pyqgis vector typeerror
edited 9 mins ago
Andre Silva
7,735113785
asked Jan 4 at 0:18
CarolinaCarolina
288
2
What is the value of areabh = blayer.getValues(blayer.fields()[0].name())[0] ? Perhaps that line has changed and the last [0] has been forgotten. I can't fully understand what it's trying to do, the comments are in a language that I don't know. Both values should be a number type but the 2nd one is a list object at that line.
– Michael Stimson
Jan 4 at 0:44
2
@MichaelStimson you are right. I need one more[0]in the lineareabh = blayer.getValues(blayer.fields()[0].name())[0]to take the value of the list. Because of this it wasn't working, because I was taking all the list, not one value of the list. So, the code have to beareabh = blayer.getValues(blayer.fields()[0].name())[0][0]. Problem solved, the code is working! Thank you!
– Carolina
Jan 4 at 14:24
add a comment |
In a academic project I've produced a small python script for watershed analysis. This script relates shapefiles attributes and generates a .txt file.
I am trying to adjust the script to use within the QGIS environment. When I use it, it shows the following error:
unsupported operand type (s) for /: 'int' and 'list' See log for more details
In logs we can see:
2019-01-03T21:10:57 2 Uncaught error while executing algorithm
Traceback (most recent call last):
File "C:/PROGRA~1/QGIS2~1.18/apps/qgis-ltr/./python/pluginsprocessingcoreGeoAlgorithm.py", line 203, in execute
self.processAlgorithm(progress)
File "C:/PROGRA~1/QGIS2~1.18/apps/qgis-ltr/./python/pluginsprocessingscriptScriptAlgorithm.py", line 381, in processAlgorithm
exec((script), ns)
File "<string>", line 123, in <module>
File "<string>", line 35, in densidade_rios
TypeError: unsupported operand type(s) for /: 'int' and 'list'
Here is the code:
from qgis.core import *
import math
# Function
def densidade_rios(valor_total_rios, valor_area_bacia):
dr = valor_total_rios / valor_area_bacia
return dr
# Loading dreinage and watershed layers
dlayer = QgsVectorLayer(Drenagem, "drenagem", "ogr")
blayer = QgsVectorLayer(Bacia, "bacia", "ogr")
# Dreinage attributes
dfeatures = dlayer.getFeatures()
# Listing values per column
listdfeatures = list(zip(*dfeatures))
# Max and min order values
maxordem = max(listdfeatures[0])
minordem = min(listdfeatures[0])
# Counting features of channel hierarchy (dreinage layer values)
ordem = minordem
hierarquia = []
while (ordem <= maxordem):
contagem = listdfeatures[0].count(ordem)
hierarquia.append(contagem)
ordem += 1
# Total of rivers - quantity of first order rivers (dreinage layer values)
totalrios = hierarquia[0]
# Watershed attributes
areabh = blayer.getValues(blayer.fields()[0].name())[0]
# Using function
dr = densidade_rios(totalrios, areabh)
Attribute table values of drenagem layer:
Attribute table values of bacia layer:
qgis python pyqgis vector typeerror
edited 9 mins ago
Andre Silva
7,735113785
asked Jan 4 at 0:18
CarolinaCarolina
288
In a academic project I've produced a small python script for watershed analysis. This script relates shapefiles attributes and generates a .txt file.
I am trying to adjust the script to use within the QGIS environment. When I use it, it shows the following error:
unsupported operand type (s) for /: 'int' and 'list' See log for more details
In logs we can see:
2019-01-03T21:10:57 2 Uncaught error while executing algorithm
Traceback (most recent call last):
File "C:/PROGRA~1/QGIS2~1.18/apps/qgis-ltr/./python/pluginsprocessingcoreGeoAlgorithm.py", line 203, in execute
self.processAlgorithm(progress)
File "C:/PROGRA~1/QGIS2~1.18/apps/qgis-ltr/./python/pluginsprocessingscriptScriptAlgorithm.py", line 381, in processAlgorithm
exec((script), ns)
File "<string>", line 123, in <module>
File "<string>", line 35, in densidade_rios
TypeError: unsupported operand type(s) for /: 'int' and 'list'
Here is the code:
from qgis.core import *
import math
# Function
def densidade_rios(valor_total_rios, valor_area_bacia):
dr = valor_total_rios / valor_area_bacia
return dr
# Loading dreinage and watershed layers
dlayer = QgsVectorLayer(Drenagem, "drenagem", "ogr")
blayer = QgsVectorLayer(Bacia, "bacia", "ogr")
# Dreinage attributes
dfeatures = dlayer.getFeatures()
# Listing values per column
listdfeatures = list(zip(*dfeatures))
# Max and min order values
maxordem = max(listdfeatures[0])
minordem = min(listdfeatures[0])
# Counting features of channel hierarchy (dreinage layer values)
ordem = minordem
hierarquia = []
while (ordem <= maxordem):
contagem = listdfeatures[0].count(ordem)
hierarquia.append(contagem)
ordem += 1
# Total of rivers - quantity of first order rivers (dreinage layer values)
totalrios = hierarquia[0]
# Watershed attributes
areabh = blayer.getValues(blayer.fields()[0].name())[0]
# Using function
dr = densidade_rios(totalrios, areabh)
Attribute table values of drenagem layer:
Attribute table values of bacia layer:
qgis python pyqgis vector typeerror
qgis python pyqgis vector typeerror
edited 9 mins ago
Andre Silva
7,735113785
asked Jan 4 at 0:18
CarolinaCarolina
288
edited 9 mins ago
Andre Silva
7,735113785
asked Jan 4 at 0:18
CarolinaCarolina
288
edited 9 mins ago
Andre Silva
7,735113785
edited 9 mins ago
Andre Silva
7,735113785
edited 9 mins ago
Andre Silva
7,735113785
7,735113785
asked Jan 4 at 0:18
CarolinaCarolina
288
asked Jan 4 at 0:18
CarolinaCarolina
288
asked Jan 4 at 0:18
CarolinaCarolina
288
288
2
What is the value of areabh = blayer.getValues(blayer.fields()[0].name())[0] ? Perhaps that line has changed and the last [0] has been forgotten. I can't fully understand what it's trying to do, the comments are in a language that I don't know. Both values should be a number type but the 2nd one is a list object at that line.
– Michael Stimson
Jan 4 at 0:44
2
@MichaelStimson you are right. I need one more[0]in the lineareabh = blayer.getValues(blayer.fields()[0].name())[0]to take the value of the list. Because of this it wasn't working, because I was taking all the list, not one value of the list. So, the code have to beareabh = blayer.getValues(blayer.fields()[0].name())[0][0]. Problem solved, the code is working! Thank you!
– Carolina
Jan 4 at 14:24
add a comment |
2
What is the value of areabh = blayer.getValues(blayer.fields()[0].name())[0] ? Perhaps that line has changed and the last [0] has been forgotten. I can't fully understand what it's trying to do, the comments are in a language that I don't know. Both values should be a number type but the 2nd one is a list object at that line.
– Michael Stimson
Jan 4 at 0:44
2
@MichaelStimson you are right. I need one more[0]in the lineareabh = blayer.getValues(blayer.fields()[0].name())[0]to take the value of the list. Because of this it wasn't working, because I was taking all the list, not one value of the list. So, the code have to beareabh = blayer.getValues(blayer.fields()[0].name())[0][0]. Problem solved, the code is working! Thank you!
– Carolina
Jan 4 at 14:24
2
2
What is the value of areabh = blayer.getValues(blayer.fields()[0].name())[0] ? Perhaps that line has changed and the last [0] has been forgotten. I can't fully understand what it's trying to do, the comments are in a language that I don't know. Both values should be a number type but the 2nd one is a list object at that line.
– Michael Stimson
Jan 4 at 0:44
What is the value of areabh = blayer.getValues(blayer.fields()[0].name())[0] ? Perhaps that line has changed and the last [0] has been forgotten. I can't fully understand what it's trying to do, the comments are in a language that I don't know. Both values should be a number type but the 2nd one is a list object at that line.
– Michael Stimson
Jan 4 at 0:44
2
2
@MichaelStimson you are right. I need one more
[0] in the line areabh = blayer.getValues(blayer.fields()[0].name())[0] to take the value of the list. Because of this it wasn't working, because I was taking all the list, not one value of the list. So, the code have to be areabh = blayer.getValues(blayer.fields()[0].name())[0][0]. Problem solved, the code is working! Thank you!– Carolina
Jan 4 at 14:24
@MichaelStimson you are right. I need one more
[0] in the line areabh = blayer.getValues(blayer.fields()[0].name())[0] to take the value of the list. Because of this it wasn't working, because I was taking all the list, not one value of the list. So, the code have to be areabh = blayer.getValues(blayer.fields()[0].name())[0][0]. Problem solved, the code is working! Thank you!– Carolina
Jan 4 at 14:24
add a comment |
1 Answer
1
active
oldest
votes
As mentioned by Michael Stimson the error is because a list was used where a number was expected.
densidade_rios is returning the result of a division, hence areabh (which is the division's denominator) needs to be a value:
areabh = blayer.getValues('Area_km2')[0][0] # where 'blayer.fields()[0].name()' is the field name 'Area_km2'.
Another way of getting areabh would be:
areabh = [f['Area_km2'] for f in blayer.getFeatures()][0]
answered 8 mins ago
Andre SilvaAndre Silva
7,735113785
add a comment |
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1 Answer
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1 Answer
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active
oldest
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oldest
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active
oldest
votes
As mentioned by Michael Stimson the error is because a list was used where a number was expected.
densidade_rios is returning the result of a division, hence areabh (which is the division's denominator) needs to be a value:
areabh = blayer.getValues('Area_km2')[0][0] # where 'blayer.fields()[0].name()' is the field name 'Area_km2'.
Another way of getting areabh would be:
areabh = [f['Area_km2'] for f in blayer.getFeatures()][0]
answered 8 mins ago
Andre SilvaAndre Silva
7,735113785
add a comment |
As mentioned by Michael Stimson the error is because a list was used where a number was expected.
densidade_rios is returning the result of a division, hence areabh (which is the division's denominator) needs to be a value:
areabh = blayer.getValues('Area_km2')[0][0] # where 'blayer.fields()[0].name()' is the field name 'Area_km2'.
Another way of getting areabh would be:
areabh = [f['Area_km2'] for f in blayer.getFeatures()][0]
answered 8 mins ago
Andre SilvaAndre Silva
7,735113785
add a comment |
As mentioned by Michael Stimson the error is because a list was used where a number was expected.
densidade_rios is returning the result of a division, hence areabh (which is the division's denominator) needs to be a value:
areabh = blayer.getValues('Area_km2')[0][0] # where 'blayer.fields()[0].name()' is the field name 'Area_km2'.
Another way of getting areabh would be:
areabh = [f['Area_km2'] for f in blayer.getFeatures()][0]
answered 8 mins ago
Andre SilvaAndre Silva
7,735113785
As mentioned by Michael Stimson the error is because a list was used where a number was expected.
densidade_rios is returning the result of a division, hence areabh (which is the division's denominator) needs to be a value:
areabh = blayer.getValues('Area_km2')[0][0] # where 'blayer.fields()[0].name()' is the field name 'Area_km2'.
Another way of getting areabh would be:
areabh = [f['Area_km2'] for f in blayer.getFeatures()][0]
answered 8 mins ago
Andre SilvaAndre Silva
7,735113785
answered 8 mins ago
Andre SilvaAndre Silva
7,735113785
answered 8 mins ago
Andre SilvaAndre Silva
7,735113785
answered 8 mins ago
Andre SilvaAndre Silva
7,735113785
7,735113785
add a comment |
add a comment |
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2
What is the value of areabh = blayer.getValues(blayer.fields()[0].name())[0] ? Perhaps that line has changed and the last [0] has been forgotten. I can't fully understand what it's trying to do, the comments are in a language that I don't know. Both values should be a number type but the 2nd one is a list object at that line.
– Michael Stimson
Jan 4 at 0:44
2
@MichaelStimson you are right. I need one more
[0]in the lineareabh = blayer.getValues(blayer.fields()[0].name())[0]to take the value of the list. Because of this it wasn't working, because I was taking all the list, not one value of the list. So, the code have to beareabh = blayer.getValues(blayer.fields()[0].name())[0][0]. Problem solved, the code is working! Thank you!– Carolina
Jan 4 at 14:24