Copies the set shallowly
Usage
The copy() method returns the Shallow copy of the specified set.
Syntax
set.copy()
Basic Example
# Copy set 'S' to 'x'
S = {'red', 'green', 'blue'}
x = S.copy()
print(x)
# Prints {'blue', 'green', 'red'}copy() vs Assignment statement
Assignment statement does not copy objects. For example,
old_Set = {'red', 'green', 'blue'}
new_Set = old_Set
new_Set.remove('red')
print(old_Set)
# Prints {'blue', 'green'}
print(new_Set)
# Prints {'blue', 'green'}When you execute new_Set = old_Set, you don’t actually have two sets. The assignment just makes the two variables point to the one set in memory.
So, when you change new_Set, old_Set is also modified. If you want to change one copy without changing the other, use copy() method.
old_Set = {'red', 'green', 'blue'}
new_Set = old_Set.copy()
new_Set.remove('red')
print(old_Set)
# Prints {'blue', 'green', 'red'}
print(new_Set)
# Prints {'blue', 'green'}