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How Can I Find The Missing Sequence Number in a Field in ArcGIS

MAMDOUHZALAKY

How Can I Find The Missing Sequence Number in a Field in ArcGIS I have thousand numbers on that field ? I have ArcGIS 10.8

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Accepted answers

JohannesLindner

You can do it with a little Python script:

fc = "TestPolygons"  # path the the feature class or name of the layer
field = "IntegerField1"

# get a set of values in the field
values = {row[0] for row in arcpy.da.SearchCursor(fc, [field])}
# get a set of the complete range
complete_values = set(range(min(values), max(values)))
# the difference between these sets are the missing numbers
missing_values = complete_values - values
print(sorted(missing_values))

JohannesLindner

fc = "TestPolygons"  # path the the feature class or name of the layer
field = "IntegerField1"
group_field = "TextField1"

# read the fc
data = [row for row in arcpy.da.SearchCursor(fc, [group_field, field])]

# iterate over the groups
groups = {d[0] for d in data}
for g in sorted(groups):
    # get the values in that group
    values = {d[1] for d in data if d[0] == g}
    # get a set of the complete range
    complete_values = set(range(min(values), max(values)))
    # the difference between these sets are the missing numbers
    missing_values = complete_values - values
    print("Missing values in group {}: {}".format(g, sorted(missing_values)))

All comments

JohannesLindner

You can do it with a little Python script:

fc = "TestPolygons"  # path the the feature class or name of the layer
field = "IntegerField1"

# get a set of values in the field
values = {row[0] for row in arcpy.da.SearchCursor(fc, [field])}
# get a set of the complete range
complete_values = set(range(min(values), max(values)))
# the difference between these sets are the missing numbers
missing_values = complete_values - values
print(sorted(missing_values))

MAMDOUHZALAKY

what should I change in your Python script to work , I create field test to run your Python script but it does not work , I want to know the missing number in field parcel ….I need more details!!!

MAMDOUHZALAKY

JohannesLindner

The script is meant to be run in the Python Window, not in the Fieled Calculator.

Open the ArcMap Python Window
Copy/Paste the script into the window
Change the first two lines
Execute by pressing Enter (may have to press it twice)

Krocha

Hello i am receiving this error message when trying to run.

fc = r"path"
field = "FXSA_ID"

# get a set of values in the field
values = {row[0] for row in arcpy.da.SearchCursor(fc, [field])}
# get a set of the complete range
complete_values = set(range(min(values), max(values)))
# the difference between these sets are the missing numbers
missing_values = complete_values - values
print(sorted(missing_values))

Traceback (most recent call last):
File "<string>", line 7, in <module>
TypeError: '<' not supported between instances of 'NoneType' and 'int'

Krocha

Never mind i got it. I had some fields that did not have a number they were NULL. Had to remove those. Not sure if there is a way to ignore them.

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