Tsviki Hirsh wrote:
>>>dict.fromkeys('at',50)
{'a': 50, 't': 50}
This is obviously not what I wanted.
Not obvious at all. It is precisely what you asked for ;-)
Please read the doc:
5.8. Mapping Types — dict
"classmethod fromkeys(seq[, value])
Create a new dictionary with keys from seq and values set to value."
The purpose of .fromkeys is to create a dict with multiple keys
initially mapped to the one and same value (None by default). If you do
not want that, do not use it.
or nearly as clear:
>>> help(dict.fromkeys)
fromkeys(...)
dict.fromkeys(S[,v]) -> New dict with keys from S and values equal
to v. v defaults to None.
I *strongly* recommend that all beginners peruse the Library Reference
up through Chapter 5. It you are puzzled by the behavior of a builtin
object, go back and look up the specific doc.
What are the alternatives?
If you want {'at':50}, say that.
Terry Jan Reedy
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