Python Collection Set

Source: Internet
Author: User
Tags new set shallow copy

# Set auto-weight, but no value, only key
s = Set ([3, 5, 9, ten]) # Create a collection of values

t = Set ("Hello") # Creates a collection of unique characters

x = ' x '

A = T | the set of S # T and S

b = Intersection of T & S # T and S

c = T -S # differential set (items in T, but not in s)

D = t ^ s # symmetric difference set (items in t or S, but not both)

# Basic Operation:

T.add (' x ') # Add an item

S.update ([Ten, Panax Notoginseng]) # Add multiple items in S

# Use Remove () to delete an item:

T.remove (' H ')

Len (s)
# The length of the set

X in S
# Test if X is a member of S

X not in S
# Test if X is not a member of S

S.issubset (t)
S <= t
# Test if every element in S is in t

S.issuperset (t)
S >= t
# Test if every element in T is in S

S.union (t)
s | T
# Returns a new set containing each element in S and T

S.intersection (t)
S & T
# Returns a new set containing the common elements in S and T

S.difference (t)
# Returns a new set containing elements in s but not in t

S.symmetric_difference (t)
s ^ t
# Returns a new set containing elements that are not duplicates in S and T

S.copy ()
# Returns a shallow copy of set "s"

Python Collection Set

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