s = set('ABC')
s.add('z')
s.update('BCD')
s.remove('DEF') # error here
s -= set('DEFG')
s = set(‘ABC’) s.add(‘z’) s.update(‘BCD’) s.remove(‘DEF’) # error here s -= set(‘DEFG’)
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s = set('ABC')
s.add('z')
s.update('BCD')
s.remove('DEF') # error here
s -= set('DEFG')
As others pointed out,
'DEF', the set member you’re trying to remove, is not a member of the set, andremove, per the docs, is specified as “Raises KeyError if elem is not contained in the set.”.If you want “missing element” to mean a silent no=op instead, just use discard instead of
remove: that’s the crucial difference between thediscardandremovemethods of sets, and the very reason they both need to exist!