假设我想删除所有"周围的字符串.在Python中,我会:
>>> s='"Don\'t need the quotes"'
>>> print s
"Don't need the quotes"
>>> print s.strip('"')
Don't need the quotes
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如果我想删除多个字符,例如"括号:
>> s='"(Don\'t need quotes and parens)"'
>>> print s
"(Don't need quotes and parens)"
>>> print s.strip('"()')
Don't need quotes and parens
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在Java中删除字符串的优雅方法是什么?
以下命令以json格式显示有关上一次git提交的一些元数据:
git show --quiet HEAD --pretty=format:"{\"hash\":\"%h\", \"author\":\"%cn\", \"commit date\":\"%cd\"}"
{
"hash":"0fc0fc0",
"author":"Adam Matan",
"commit date":"Sun Jan 26 12:26:19 2014 +0200"}
}
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有没有办法在UTC/GMT时区中显示日期,例如"Sun Jan 26 10:26:19 2014"?
当我在uwsgi中运行Flask应用程序时,后台线程和应用程序函数在查询同一队列的大小时会看到不同的值.
GET调用返回队列的大小.POST呼叫添加到队列的元素.当应用程序来自shell时python tester.py,我得到了预期的结果:
2014-06-07 14:20:50.677995 Queue size is: 0
127.0.0.1 - - [07/Jun/2014 14:20:51] "POST /addMessage/X HTTP/1.1" 200 -
2014-06-07 14:20:51.679277 Queue size is: 1
2014-06-07 14:20:52.680425 Queue size is: 1
2014-06-07 14:20:53.681566 Queue size is: 1
2014-06-07 14:20:54.682708 Queue size is: 1
127.0.0.1 - - [07/Jun/2014 14:20:55] "POST /addMessage/Y HTTP/1.1" 200 -
2014-06-07 14:20:55.687755 Queue size is: 2
2014-06-07 14:20:56.688867 Queue size is: 2
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但是,当使用app执行时 …
当我CGFontCreateWithDataProvider 在飞机模式下拨打电话时,我的应用会冻结.不是飞机模式,它工作正常.字体存储在设备上,不应该发生网络访问.
在调用此方法加载本地字体文件时:
[self registerIconFontWithURL:[[NSBundle mainBundle] URLForResource:@"FontAwesome" withExtension:@"otf"]];
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的值url在下面的方法是:
文件:///var/mobile/Applications/48D3DA14-235B-4450-A081-7A6BA6116667/Blah.app/FontAwesome.otf
+ (void)registerIconFontWithURL:(NSURL *)url
{
NSAssert([[NSFileManager defaultManager] fileExistsAtPath:[url path]], @"Font file doesn't exist");
CGDataProviderRef fontDataProvider = CGDataProviderCreateWithURL((__bridge CFURLRef)url);
//******Freezes after the next line******
CGFontRef newFont = CGFontCreateWithDataProvider(fontDataProvider);
//******FROZEN******
CGDataProviderRelease(fontDataProvider);
CFErrorRef error;
CTFontManagerRegisterGraphicsFont(newFont, &error);
CGFontRelease(newFont);
}
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iOS 7.1.x,iPhone 5.
我不知道为什么会发生这种情况并且无法找到任何帮助.有没有人知道为什么会发生这种情况?
提前致谢!
使用Python读取Unix域套接字文件类似于普通的TCP套接字:
>>> import socket
>>> import sys
>>>
>>> server_address = '/tmp/tbsocket1' # Analogous to TCP (address, port) pair
>>> sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
>>> sock.connect(server_address)
>>> sock.recv(512)
'*** uWSGI Python tracebacker output ***\n\n'
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由于UDS不是普通文件,因此cat不适用于它们:
$ sudo cat /tmp/tbsocket1
cat: /tmp/tbsocket1: No such device or address
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也没有curl:
$ sudo curl /tmp/tbsocket1
curl: (3) <url> malformed
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如何使用标准命令行工具(如curl)读取或写入Unix域套接字?
PS:在一个奇怪的巧合,一个卷曲补丁建议最近)
请考虑ReStructuredText中的以下列表:
Broken list example
-------------------
#. First do spam
#. Then do ``eggs``
.. note::
Nobody expects the Spanish Inquisistion
#. The list restarts after the note
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在Sphinx中编译列表时,注释后的数字将重置为1:

任何想法如何在一note节后继续编号列表?
可能重复:
递归创建目录
什么是创建导演的java-esque方式,如果存在则不抱怨?
引用该男子mkdir:
-p Create intermediate directories as required... with this option
specified, no error will be reported if a directory given as an
operand already exists.
Run Code Online (Sandbox Code Playgroud) 请考虑下表:
Column | Type |
--------------------+--------------------------+
id | bigint |
creation_time | timestamp with time zone |
...
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像下面这样的查询(更不用说更复杂的JOIN)需要相当长的时间,因为它们需要为每个项计算creation_time :: DATE:
SELECT creation_time::DATE, COUNT(*) FROM items GROUP BY 1;
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如何在时间戳的那一天创建索引 - creation_time::DATE?
我试过了:
CREATE INDEX items_day_of_creation_idx ON items (creation_time)::date;CREATE INDEX items_day_of_creation_idx ON items (creation_time::date);但都失败了:
ERROR: syntax error at or near "::"
Run Code Online (Sandbox Code Playgroud) 我想旋转08-file.pdf使用CLI工具命名的351K PDF .我尝试过imagemagick:
convert 08-file.pdf -rotate 90 08-file-rotated.pdf
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但原始质量:
遭受严重退化:
我试过添加这个-density 300x300参数,但结果是一个2.5M的文件,比原来大一个数量级,这是一个巨大的浪费.
知道如何使用imagemagick无损旋转PDF文件吗?
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