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Compare double to zero using epsilon
...grammer is intending. Assuming 64-bit IEEE 754, in your example same(0, 1e-100) returns false, which is probably not what the programmer wants. The programmer probably rather wants some small threshold to test for equality, e.g. +/-1e-6 or +/-1e-9, instead of +/-nextafter.
– vi...
Emacs bulk indent for Python
...pply it 10 times.
(I know it doesn't sound like much, but try re-indenting 100 lines of garbage literal without missing down-arrow, and then having to go up 5 lines and repeat things ;) ).
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Get difference between two lists
...f x not in s]
Performance test
import timeit
init = 'temp1 = list(range(100)); temp2 = [i * 2 for i in range(50)]'
print timeit.timeit('list(set(temp1) - set(temp2))', init, number = 100000)
print timeit.timeit('s = set(temp2);[x for x in temp1 if x not in s]', init, number = 100000)
print timeit...
Android: Expand/collapse animation
...View, 2000, 200);
// Collapsing the View
collapse(yourView, 2000, 100);
Easy enough!
Thanks LenaYan for the initial code!
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Similarity String Comparison in Java
...
The common way of calculating the similarity between two strings in a 0%-100% fashion, as used in many libraries, is to measure how much (in %) you'd have to change the longer string to turn it into the shorter:
/**
* Calculates the similarity (a number within 0 and 1) between two strings.
*/
p...
Mysql error 1452 - Cannot add or update a child row: a foreign key constraint fails
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100
I had the same issue with my MySQL database but finally, I got a solution which worked for me....
Get top 1 row of each group
...one to many, but want to filter out all except a one to one. Scenario: For 100 members, give me each their best phone number (where each could have several numbers). This is where Apply excels. Less reads = less disk access = better performance. Given my experience is with poorly designed non-normal...
MySQL复制的概述、安装、故障、技巧、工具 - 数据库(内核) - 清泛网 - 专注...
...务器配置文件（缺省：/etc/my.cnf）：
[mysqld]
server_id = 100
log_bin = mysql-bin
log_bin_index = mysql-bin.index
sync_binlog = 1
innodb_flush_log_at_trx_commit = 1
innodb_support_xa = 1
注：一定要保证主从服务器各自的server_id唯一，避免冲突。
注：如...
Automatically update version number
...y to always get back to the codebase that generated the assembly (e.g. 1.4.100.1502 was built from revision 1502).
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Why does i = i + i give me 0?
... @Taemyr Probably, but then he could have replaced true with i<10000 :)
– Bernhard
Jun 12 '14 at 10:12
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