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How to merge dictionaries of dictionaries?
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147
this is actually quite tricky - particularly if you want a useful error message when things ar...
嵌套块验证失败：未知的代码块类型: procedures_ifreturn，已拒绝添加 - AI...
...p; <comment pinned=\"false\" h=\"80\" w=\"160\">计算一个非负整数的阶乘。\n输入：n (数字)\n返回：n! (数字)</comment>\n <statement name=\"STACK\">\n <block type=\"controls_if\">...
Converting file size in bytes to human-readable string
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19 Answers
19
Active
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Is a Java hashmap search really O(1)?
I've seen some interesting claims on SO re Java hashmaps and their O(1) lookup time. Can someone explain why this is so? Unless these hashmaps are vastly different from any of the hashing algorithms I was bought up on, there must always exist a dataset that contains collisions.
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JavaScript % (modulo) gives a negative result for negative numbers
According to Google Calculator (-13) % 64 is 51 .
11 Answers
11
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XDocument.ToString() drops XML Encoding Tag
...st
{
static void Main()
{
string xml = @"<?xml version='1.0' encoding='utf-8'?>
<Cooperations>
<Cooperation />
</Cooperations>";
XDocument doc = XDocument.Parse(xml);
StringBuilder builder = new StringBuilder();
using (TextWriter wri...
Closing multiple issues in Github with a commit message
I know you can close issues by putting closes #1 or fixes #1 in the commit message. What is the best way to close multiple issues in the same commit message?
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How do I check the difference, in seconds, between two dates?
...es, use total_seconds like this:
import datetime as dt
a = dt.datetime(2013,12,30,23,59,59)
b = dt.datetime(2013,12,31,23,59,59)
(b-a).total_seconds()
86400.0
#note that seconds doesn't give you what you want:
(b-a).seconds
0
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