大约有 5,550 项符合查询结果（耗时：0.0229秒） [XML]
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
...
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
7
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What are best practices for validating email addresses on iOS 2.0
...*\\.)+[a-z]{2,4}\\z";
NSString *regex2 = @"^(?=.{1,64}@.{4,64}$)(?=.{6,100}$).*";
NSPredicate *test1 = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", regex1];
NSPredicate *test2 = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", regex2];
return [test1 evaluateWithObject:ema...
How to round a number to significant figures in Python
... can use negative numbers to round integers:
>>> round(1234, -3)
1000.0
Thus if you need only most significant digit:
>>> from math import log10, floor
>>> def round_to_1(x):
... return round(x, -int(floor(log10(abs(x)))))
...
>>> round_to_1(0.0232)
0.02
&g...