On 9/20/2016 9:12 AM, Peter Otten wrote:

在 2016年9月20日星期二 UTC-4上午8:17:13,BartC写道:
On 20/09/2016 13:12, 38016226...@gmail.com wrote:
d = {}
keys = range(256)
vals = map(chr, keys)
map(operator.setitem, [d]*len(keys), keys, vals)


It is from python library. What does [d]*len(keys) mean?
d is the name of dict but put d in [] really confused me.

Where in which 'python library? I cannot findI the above in 2.7 or 3.6 stdlib. The code should be replaced by

It should be noted that the code above is really bad Python.
Better alternatives are the simple loop

d = {}
for i in range(256):
     d[i] = chr(i)

or the dict comprehension

d = {i: chr(i) for i in range(256)}

this.

--
Terry Jan Reedy


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