python spur ssh - use set command

I am using the below commands to ssh into a windows server and I am trying to use the set command. This is what I am using locally which works:

set ASPERA_SCP_PASS=myPassword
ascp /directory/Test4.mov myAccount@10.1.1.1:/TEST

And here is my python commands:

shell = spur.SshShell(hostname=10.0.0.1, username=Wusername, password=Wpassword, missing_host_key=spur.ssh.MissingHostKey.accept)
result = shell.run(["set", "ASPERA_SCP_PASS=myPassword])
result = shell.run(["ascp.exe", "/directory/Test4.mov", "myAccount@10.1.1.1:/TEST"])

When running the above I am successfully connecting via ssh, but I am getting this error on the set command:

spur.results.RunProcessError: return code: 127
output: b''
stderr output: b'sh: line 0: exec: set: not found\n'