Python Set difference() Method
Example
Return a set that contains the items that only exist in set
  x, and not in set y:
    x = 
    {"apple", "banana", "cherry"}
y = {"google", 
    "microsoft", "apple"}
z = x.difference(y)
    
print(z)
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Definition and Usage
The difference() method returns a set that 
contains the difference between two sets.
Meaning: The returned set contains items that exist only in the first set, and not in both sets.
Syntax
  
    set.difference(set)
  
Parameter Values
| Parameter | Description | 
|---|---|
| set | Required. The set to check for differences in | 
More Examples
Example
Reverse the first example. Return a set that contains the items 
  that only exist in set y, and not in set
  x:
    x = 
    {"apple", "banana", "cherry"}
y = {"google", 
    "microsoft", "apple"}
z = y.difference(x)
    
print(z)
  Try it Yourself »
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