Hi, everyone,
I want to create a sparse matrix, so I need to create a dict first. I
try to use `dict.fromkeys()` to do it, which like following:
```
sage: keys = [(0,1),(1,2)] # the length of keys maybe very long
sage: values = [0,1] # values have the same length as keys
sage: d = dict.fromkeys(keys,values)
sage: d
{(0, 1): [0, 1], (1, 2): [0, 1]}
```
But the result is not what I want, and I want to get this:
```
{(0,1):0,(1,2):1}
```
Does there exist other way to do this? Hope to get your help, thanks
very much.
Best
Huayi
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