Data Structure(2)

Set

Collection of data elements like list or array.

• Unordered
• Elements are not stored by insertion (unexpected order)
• Mutable
• Duplicate entries are not possible

# No Duplicate values -> not working
x = set(['wecode','wework','wecode'])
# Non-duplicate value can be added -> working
x.add('weplay')
# Another duplicates -> not working
x.add('weplay')

• It's for fast lookup

Structure of hash

• Elements are not stored in order in hash