On 14/02/2021 21:50, Chris Green wrote:
It isn't clear from the documentation. Does email.message.get() care
about the case of the header it's getting?
I checking mailing list mails and the "List-Id:" header is a bit
'mixed', i.e. it can be List-Id:, or List-ID: or list-id:, will
email.message.get("List-Id:", "unknown") find all of them?
Let's have a look:
>>> import email.message
>>> email.message.get
Traceback (most recent call last):
File "<pyshell#19>", line 1, in <module>
email.message.get
AttributeError: module 'email.message' has no attribute 'get'
OK, you probably meant
>>> email.message.Message.get
<function Message.get at 0x031AEBB0>
Enter the inspect module for a quick glance at the method's source:
>>> import inspect
>>> print(inspect.getsource(email.message.Message.get))
def get(self, name, failobj=None):
"""Get a header value.
Like __getitem__() but return failobj instead of None when the
field
is missing.
"""
name = name.lower()
for k, v in self._headers:
if k.lower() == name:
return self.policy.header_fetch_parse(k, v)
return failobj
Both the `name` argument and the header keys are converted to lowercase
before the comparison, so yes, the method is case-insensitive (whether
it should be casefold() doesn't matter for ascii-strings).
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