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Changing column names of a data frame
...k it was asked for data.frame, not data.table
– Helix123
Apr 16 '15 at 19:15
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Fragment lifecycle - which method is called upon show / hide?
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123
Similar to activity lifecycle, Android calls onStart() when fragment becomes visible. onStop()...
How to suppress scientific notation when printing float values?
...s really what you want? I don't: >>> print('{:f}'.format(0.000000123)) 0.000000
– duality_
May 22 '18 at 10:06
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Failed to build gem native extension (installing Compass)
...by-2.1.2 as 1.9.3 is no longer being updated
– timelf123
Aug 13 '14 at 16:47
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Java: parse int value from a char
...n be converted into int(0 to 9), e.g., '5'-'0' gives int 5.
String str = "123";
int a=str.charAt(1)-'0';
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How do I access command line arguments in Python?
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123
import sys
sys.argv[1:]
will give you a list of arguments (not including the name of the py...
What is difference between instantiating an object using new vs. without
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The line:
Time t (12, 0, 0);
... allocates a variable of type Time in local scope, generall...
Regex, every non-alphanumeric character except white space or colon
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Try this:
[^a-zA-Z0-9 :]
JavaScript example:
"!@#$%* ABC def:123".replace(/[^a-zA-Z0-9 :]/g, ".")
See a online example:
http://jsfiddle.net/vhMy8/
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构建高并发高可用的电商平台架构实践 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...系统任务。存储引擎层有很多种，mysql提供了存储引擎的插件式结构，支持多种存储引擎，用的最广泛的是innodb和myisamin；inodb主要面向OLTP方面的应用，支持事务处理，myisam不支持事务，表锁，对OLAP操作速度快。
以下主要针对in...