ArcGIS Python query syntax

Question

I am struggling with running a simple piece of code using Python in ArcGIS field calculator. I suspect it could be a very simple error and need an extra set of eyes.

For summer months (Dec-Feb) and winter months (Jun-Aug) I would like to check for specific minimum and maximum values in my data and assign them a comment if the query is met. The code that I have written is given below, however, when running the code I get a syntax parsing error.

def Reclass (tmeanJAN,tmeanFEB,tmeanDEC,tmeanJUN,tmeanJUL,tmeanAUG):
 if tmeanJAN and tmeanFEB and tmeanDEC = 28:
 return "Ideal maximum summer temperature"
 elif tmeanJAN and tmeanFEB and tmeanDEC = 18:
 return "Ideal minimum summer temperature"
 elif tmeanJUN and tmeanJUL and tmeanAUG = 23:
 return "Ideal maximum winter temperature"
 elif tmeanJUN and tmeanJUL and tmeanAUG = 8:
 return "Ideal minimum winter temperature"
 else:
 return "N/A"

Called with:

Reclass(!Int_tmeanJAN!, !Int_tmeanFEB!, !Int_tmeanDEC!, !Int_tmeanJUN!, !Int_tmeanJUL!, !Int_tmeanAUG!)

A sample of my dataset is provided in the screenshot: enter image description here

Answer 1

= should be ==

= is for assigning a value to a variable, for example a=10

== is for comparing, 10==10 will be True

But your function wont work as intended:

a = 1
b = 2
c = 1
print a and c and b == 1
False

But:

print a and b and c == 1
True

b isnt 1, but it says True. You are asking are a not null and b not null and c 1, and that is True.

Try this instead:

def Reclass (tmeanJAN,tmeanFEB,tmeanDEC,tmeanJUN,tmeanJUL,tmeanAUG):
 if all(temp==28 for temp in [tmeanJAN, tmeanFEB, tmeanDEC]):
 return "Ideal maximum summer temperature"
 elif all(temp==18 for temp in [tmeanJAN, tmeanFEB, tmeanDEC]):
 return "Ideal minimum summer temperature"
 elif all(temp==23 for temp in [tmeanJUN, tmeanJUL, tmeanAUG]):
 return "Ideal maximum winter temperature"
 elif all(temp==8 for temp in [tmeanJUN, tmeanJUL, tmeanAUG]):
 return "Ideal minimum winter temperature"
 else:
 return "N/A"