Merging Fields into new field using python and eliminating space in before and after the field using field calculator

Question

Am interested in combining ClASS1 and SUBCLASS1 to form the one combined class. I wrote the expression as follows "() ()" format( !CLASS1!replace(" "","" ),( !SUBCLASS1!replace(" "","" ))as shown in the Image[![field to be combined and expression] [![enter image description here] enter image description here

but after executing I get the following error message error message

• PolyGeo: Please always present errors as text rather than pictures.

Answer 1

If spaces before or after the values in CLASS1 and SUBCLASS1 are the only issue, the expression could be simplified by using the strip method instead:

"{} {}".format(!CLASS1!.strip(), !SUBCLASS1!.strip())

Answer 2

As the error states, your syntax is wrong. I assume you want to replace spaces with commas. Try this line for your expression:

"{} {}".format(!CLASS1!.replace(" ",","),(!SUBCLASS1!.replace(" ",","))

EDIT:

Since I now see what your data looks like, I guess the .strip() option is the nicer choice. If you still want to use the .replace() function try this:

"{} {}".format(!CLASS1!.replace(" ",""),(!SUBCLASS1!.replace(" ",""))

• Delonix R.: Should 0 and 1 be in between the curly brackets? like this: "{0}{1}"... will still work if the curly brackets are empty?
• dru87: the {0} and {1} are only necessary, if you refer to the place markes in a different order. example: "{0} {1} {0}".format("A", "B") will return "A B A". so in this case they are not necessary.
• Bjorn: @DelonixR. if no indices are used in the expression, format will use the parameters in the order they are entered.