Retention/Intersection Update ( &= ) : Set « Collections « Python Tutorial

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Python Tutorial » Collections » Set 
9.3.14.Retention/Intersection Update ( &= )
s = set('ABC')
u = frozenset(s)
s = set(u)
s &= set('BC')
print s
9.3.Set
9.3.1.Set operations
9.3.2.How to Create and Assign Set Types
9.3.3.How to Access Values in Sets
9.3.4.How to Update Sets
9.3.5.Membership (in, not in)
9.3.6.Set Equality/Inequality
9.3.7.Subset Of/Superset Of
9.3.8.Union ( | )
9.3.9.Intersection ( & )
9.3.10.Difference/Relative Complement ( - )
9.3.11.Symmetric Difference ( ^ )
9.3.12.Mixed Set Type Operations
9.3.13.(Union) Update ( | = )
9.3.14.Retention/Intersection Update ( &= )
9.3.15.Difference Update ( - = )
9.3.16.Symmetric Difference Update ( ^ = )
9.3.17.len() returns the number of elements
9.3.18.set() and frozenset() functions generate mutable and immutable sets, respectively.
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