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Equivalent of .try() for a hash to avoid “undefined method” errors on nil? [duplicate]
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edited May 1 '13 at 4:29
mkenyon
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Return multiple columns from pandas apply()
...ue) + ' MB'
s['size_gb'] = locale.format("%.1f", s['size'] / 1024.0 ** 3, grouping=True) + ' GB'
return s
df_test = df_test.append(rows_list)
df_test = df_test.apply(sizes, axis=1)
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How to initialise a string from NSData in Swift
...tastring = NSString(data: fooData, encoding: NSUTF8StringEncoding)
Swift 3 or newer:
let datastring = NSString(data: fooData, encoding: String.Encoding.utf8.rawValue)
This doc explains the syntax.
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Why is there no tuple comprehension in Python?
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You can use a generator expression:
tuple(i for i in (1, 2, 3))
but parentheses were already taken for … generator expressions.
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How to keep keys/values in same order as declared?
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What is non-blocking or asynchronous I/O in Node.js?
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Synchronous vs Asynchronous
Synchronous execution usually refers to code executing in sequenc...
How to split a long regular expression into multiple lines in JavaScript?
...,[\]\\.,;:\\s@\"]+)*)',
'|(\\".+\\"))@((\\[[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\.',
'[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\\.)+',
'[a-zA-Z]{2,}))$'].join(''));
Notes:
when converting the expression literal to a string you need to ...
Clang optimization levels
On gcc, the manual explains what -O3 , -Os , etc. translate to in terms of specific optimisation arguments ( -funswitch-loops , -fcompare-elim , etc.)
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深入理解 x86/x64 的中断体系 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...，offset 在低端，segment 在高端，整个 IVT 表从地址 0x0 - 0x3FF，占据了 1024 个字节，即 1K bytes
1.2 改变中断向量表地址
事实上，我们完全可以在实模式下更改 IVT 的地址，下面的代码作为示例：
; ******************************...