Merging lines of one feature class from pair coordinates with ArcPy

Question

cursor=arcpy.da.searchCursor("mettaled", "SHAPE@")
for row in cursor:
    geom=row[0]
    for part in geom:
        for pnt in part:
        x,y=pnt.X, pnt.Y
        print x,y

I am trying to merge the intersected line together(one feature class), but the problem is that some of those line having gaps and not intersected 100%. note: I used to do it with 'unsplit line' then 'spatial join' but that didn't work with gaped lines.

Can anyone do that with arcpy like list coordinates of the lines and connect-append the end point with the start of the next line

Answer 1

What will work in this situation since the parts are inline with each other is to take the points from each part and create a new, single ArcPy array and pass that to the Polyline constructor to create a new single-part polyline.

>>> import arcpy
>>> 
>>> install_info = arcpy.GetInstallInfo()
>>> f"{install_info['ProductName']}, {install_info['Version']}"
'ArcGISPro, 2.9.1'
>>> 
>>> # illustrative code for combining multi-part polyline to single-part polyline
>>> multi_polyline = arcpy.FromWKT('MULTILINESTRING((0 0, 2 0, 2 1, 4 1),(8 2, 10 2, 12 4))')
>>> multi_polyline.isMultipart
True
>>> multi_polyline.partCount
2
>>>
>>> single_polyline = arcpy.Polyline(
...     arcpy.Array([vertex for part in multi_polyline for vertex in part])
... )
>>> single_polyline.isMultipart
False
>>> single_polyline.partCount
1
>>>
>>> # modified OP code to combine multi-part polyline to single-part polyline
with arcpy.da.SearchCursor("mettaled", "SHAPE@") as cur:
    for shape, in cur:  # notice the comma after shape for tuple unpacking
        new_shape = arcpy.Polyline(
            arcpy.Array([vertex for part in shape for vertex in part]),
            shape.spatialReference
        )
        cur.updateRow([new_shape])
        
>>>