Hi, Dan, Thanks very much! It works very well. -- Huayi
On 2015年05月20日 09:39, Dan Drake wrote:
On Wed, 20 May 2015 at 06:27AM +0800, Huayi Wei wrote: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.Try just "dict()": dict(zip(keys, values)) {(0, 1): 0, (1, 2): 1} Here's how zip() works, if you don't already know: https://docs.python.org/3.5/library/functions.html#zip Dan
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