ERROR 010328: Syntax error at or near symbol ).

[tomwaddington]

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\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 <module>
    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]

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)

[tomwaddington]

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 <module>
    gp.MultiOutputMapAlgebra_sa(InExpression1)
RuntimeError: Object: Error in executing tool
>>>

[LornaMurison]

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.