This works:
sage: *for* i *in* [ZZ,QQ,RR]:
....: print('empty string in',i,':','' *in* i)
....:
empty string in Integer Ring : False
empty string in Rational Field : False
empty string in Real Field with 53 bits of precision : False
This gives an error:
sage: '' *in* CC
[…]
^
SyntaxError: invalid syntax
Why?
TIA,
Guillermo
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