ERROR 010328: Syntax error at or near symbol ).

Question

Hi im pretty new to python but im developing a code to identify automatic release zones for avalanches. i have the code working every time when i use the specific directory but when changing it to a generic directory so it can be used with different data sets with minimal changes other than changing the workspace i keep getting syntax errors ive managed to get the code working up to this point (shown below) but cant work out why it keeps presenting me with the error. # Process: Release raster... curv_plan_1 = workspace + "\curv_plan_1" slope = workspace + "\slope" dem_resample = workspace + "\dem_resample" InExpression1 = workspace + "\rel_rast" + " = con((" + curv_plan_1 + " < 3) and (" + slope + " >= 30) and (" + slope + "<= 60) and (" + dem_resample + " > 900), 1, 0) " print InExpression1 gp.MultiOutputMapAlgebra_sa(InExpression1) Here is the print and error output that it comes with. H:\Internship_Tom_Waddington\old_code\data el_rast = con((H:\Internship_Tom_Waddington\old_code\data\curv_plan_1 < 3) and (H:\Internship_Tom_Waddington\old_code\data\slope >= 30) and (H:\Internship_Tom_Waddington\old_code\data\slope<= 60) and (H:\Internship_Tom_Waddington\old_code\data\dem_resample > 900), 1, 0) Traceback (most recent call last): File "H:\Internship_Tom_Waddington\old_code\codes\path_my_old_25a.py", line 79, in gp.MultiOutputMapAlgebra_sa(InExpression1) ExecuteError: ERROR 010328: Syntax error at or near symbol ). ERROR 010267: Syntax error in parsing grid expression. Failed to execute (MultiOutputMapAlgebra).

LornaMurison · Answer

I've found that with things like the raster calculator, Arc is VERY finicky about syntax.  Things like not having spaces in between each argument can throw it off.
I would play around with it in the raster calculator until you can get it to work and then try again in python.

MicrosoftTeams-image.png

VictorZhou1_0-1633662292078.png

tomwaddington · Answer

I tried what you suggested and now i get this error message. ('H:\Internship_Tom_Waddington\old_code\data\rel_rast = con((H:\Internship_Tom_Waddington\old_code\data\curv_plan_1', ' < 3) and (H:\Internship_Tom_Waddington\old_code\data\slope', ' >= 30) and (H:\Internship_Tom_Waddington\old_code\data\slope', '<= 60) and (H:\Internship_Tom_Waddington\old_code\data\dem_resample', ' > 900), 1, 0) ') Traceback (most recent call last): File "H:\Internship_Tom_Waddington\old_code\codes\path_my_old_25a.py", line 79, in gp.MultiOutputMapAlgebra_sa(InExpression1) RuntimeError: Object: Error in executing tool >>>

LornaMurison · Answer

I am not very familiar with map algebra, but it seems like you might need something like a comma in between your input files and the (<3, >=30 etc...) condition. Like:H:\Internship_Tom_Waddington\old_code\data\rel_rast = con((H:\Internship_Tom_Waddington\old_code\data\curv_plan_1, < 3) and (H:\Internship_Tom_Waddington\old_code\data\slope, >= 30) and (H:\Internship_Tom_Waddington\old_code\data\slope,<= 60) and (H:\Internship_Tom_Waddington\old_code\data\dem_resample, > 900), 1, 0)