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TypeError: “unsupported operand type(s) for /: 'int' and 'list'” in QGIS?

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2

0

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

share|improve this question

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 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 | 

2

0

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

share|improve this question

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 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 | 

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

share|improve this question

edited 9 mins ago

Andre Silva

7,735113785

asked Jan 4 at 0:18

CarolinaCarolina

288

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'

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)

share|improve this question

edited 9 mins ago

Andre Silva

7,735113785

asked Jan 4 at 0:18

CarolinaCarolina

288

share|improve this question

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

asked Jan 4 at 0:18

CarolinaCarolina

288

asked Jan 4 at 0:18

CarolinaCarolina

288

1 Answer
1

active

oldest

votes

0

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]

share

answered 8 mins ago

Andre SilvaAndre Silva

7,735113785

add a comment | 

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0

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]

share

answered 8 mins ago

Andre SilvaAndre Silva

7,735113785

add a comment | 

0

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]

share

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]

share

answered 8 mins ago

Andre SilvaAndre Silva

7,735113785

areabh = blayer.getValues('Area_km2')[0][0] # where 'blayer.fields()[0].name()' is the field name 'Area_km2'.

areabh = [f['Area_km2'] for f in blayer.getFeatures()][0]

share

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