[issue10839] email module should not allow some header field repetitions
Raymond Hettinger
report at bugs.python.org
Sun Jun 12 17:19:07 EDT 2016
Raymond Hettinger added the comment:
Would you consider raising an exception at least for the case of a "To:" header or perhaps a warning or someother failsafe.
Using __setitem__ for appending instead of replacement is surprising and in the case of LetsEncrypt was a small disaster. There is a docstring explaining what is going on but that typically isn't visible to the user of the square brackets operator.
For Python3.6, I think there should be an alternative API that doesn't use the square brackets operator: add_header, replace_header, remove_header or somesuch. The problem is that square brackets never suggests appending which is what is actually happening.
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<http://bugs.python.org/issue10839>
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