On 4/29/2016 6:29 PM, Stephen Hansen wrote:
If isupper/islower were perfect opposites of each-other, there'd be no
need for both. But since characters can be upper, lower, or *neither*,
you run into this situation.
Based upon the official documentation, I was expecting perfect opposites.
str.islower(): "Return true if all cased characters [4] in the string
are lowercase and there is at least one cased character, false otherwise."
https://docs.python.org/3/library/stdtypes.html?highlight=islower#str.islower
str.isupper(): "Return true if all cased characters [4] in the string
are uppercase and there is at least one cased character, false otherwise."
https://docs.python.org/3/library/stdtypes.html?highlight=isupper#str.isupper
Here's the footnote that may or not be relevant to this discussion: "[4]
Cased characters are those with general category property being one of
“Lu” (Letter, uppercase), “Ll” (Letter, lowercase), or “Lt” (Letter,
titlecase)."
A bug in the docs?
Thank you,
Chris R.
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