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how to concatenate two dictionaries to create a new one in Python? [duplicate]
...nate the items and call dict on the resulting list:
$ python -mtimeit -s'd1={1:2,3:4}; d2={5:6,7:9}; d3={10:8,13:22}' \
'd4 = dict(d1.items() + d2.items() + d3.items())'
100000 loops, best of 3: 4.93 usec per loop
Fastest: exploit the dict constructor to the hilt, then one update:
$ python -mtim...
Why is MySQL's default collation latin1_swedish_ci?
What is the reasoning behind setting latin1_swedish_ci as the compiled default when other options seem much more reasonable, like latin1_general_ci or utf8_general_ci ?
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Is PHP's count() function O(1) or O(n) for arrays?
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Well, we can look at the source:
/ext/standard/array.c
PHP_FUNCTION(count) calls php_count_r...
Difference between CTE and SubQuery?
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103
In the sub-query vs simple (non-recursive) CTE versions, they are probably very similar. You w...
Unix command to find lines common in two files
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实时预览录制使用指导 · App Inventor 2 中文网
...，将同名事件的处理合并到一个事件积木中。
when Screen1.Initialize() {
Screen1.AskForPermission("android.permission.CAMERA")
Screen1.AskForPermission("android.permission.RECORD_AUDIO")
}
when Screen1.PermissionGranted(权限名称) {
if 权限名称 == "android.permission.C...
Is there a difference between using a dict literal and a dict constructor?
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How to use background thread in swift?
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error: default argument given for parameter 1
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Where's my JSON data in my incoming Django request?
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