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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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Delete the first three rows of a dataframe in pandas
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Use iloc:
df = df.iloc[3:]
will give you a new df without the first three rows.
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How to get active user's UserDetails
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Preamble: Since Spring-Security 3.2 there is a nice annotation @AuthenticationPrincipal described at the end of this answer. This is the best way to go when you use Spring-Security >= 3.2.
When you:
use an older version of Spring-Security,
need to loa...
VSS使用指南 - 开源 & Github - 清泛网 - 专注IT技能提升
...代码的再使用—— 追踪程序基准使得代码可重用。
1.1.3 文件的拆分和共享
在VSS中可以实现一个文件被多个项目共享(share)。在一个项目中对文件的改动可以自动反映到其他共享的项目中去。这正提倡了代码重用。在file菜单中...
Custom Python list sorting
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edited Feb 5 '15 at 17:33
Charlie
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answered Aug 7 '12 at 16:...
How to hash a string into 8 digits?
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answered Apr 15 '13 at 6:17
Raymond HettingerRaymond Hettinger
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How to re-raise an exception in nested try/except blocks?
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As of Python 3 the traceback is stored in the exception, so a simple raise e will do the (mostl...
Why do I get an UnsupportedOperationException when trying to remove an element from a List?
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1032
Quite a few problems with your code:
On Arrays.asList returning a fixed-size list
From the AP...
程序员之网络安全系列（二）：如何安全保存用户密码及哈希算法 - 更多技术 ...
...码试一下上面的第二点 （MD5是一种常用的Hash算法)
2.2.3 :003 > require 'digest/md5.so'
=> true
2.2.3 :004 > puts Digest::MD5.hexdigest('I love you')
e4f58a805a6e1fd0f6bef58c86f9ceb3
=> nil
2.2.3 :005 > puts Digest::MD5.hexdigest('I love you!')
690a8cda8894e37a6fff4d1790d53b...