api_key property
Use this property to set and retrieve your Eyes license key.
To obtain your API key, see How to obtain your API key.
Syntax
config.api_key = configval
configval = config.api_key
Type:Text
A string that is your API Key.
Remarks
Set this immediately after the Eyes object is created (before calling open).
If you have an environment variable called APPLITOOLS_API_KEY that is set to the value
of your API key, then you do not need to call this method, and Eyes will take the string from the environment value.