Python Built-in Methods – Python Set copy() Method

Python Set copy() Method

Copies the set shallowly


The copy() method returns the Shallow copy of the specified set.



Basic Example

# Copy set 'S' to 'x'
S = {'red', 'green', 'blue'}
x = S.copy()
# 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
# Prints {'blue', 'green'}
# 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.


set copy method vs assignment statement


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()
# Prints {'blue', 'green', 'red'}
# Prints {'blue', 'green'}


Python Example for Beginners

Two Machine Learning Fields

There are two sides to machine learning:

  • Practical Machine Learning:This is about querying databases, cleaning data, writing scripts to transform data and gluing algorithm and libraries together and writing custom code to squeeze reliable answers from data to satisfy difficult and ill defined questions. It’s the mess of reality.
  • Theoretical Machine Learning: This is about math and abstraction and idealized scenarios and limits and beauty and informing what is possible. It is a whole lot neater and cleaner and removed from the mess of reality.

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