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a=[2,3,4,9a] #error
a=[2,3,4,9b] # error
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a=[2,3,4,9j] # okay
a=[2,3,4,9k] # error
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a=[2,3,4,9z] # error
I understand why others are giving errors but why is a=[2,3,4,9j] okay
9jis the imaginary number (complex number) so it is a valid literal. Other ones are not. May be you want strings in which case you should write'9a','9b', etc. with quotes (single or double).