没有做客户端过滤或POST一次性map/reduce(这会导致表扫描),有没有办法查询标记为tagA 或 tagB?
为什么我不能使用mod_rewrite与此类似的规则:
RewriteEngine On
RewriteCond %{ENV:did_rewrite} !=true
RewriteCond %{REQUEST_URI} ^(.*)/
RewriteRule (.*) %1/foo.php?original=$1 [E=did_rewrite:true]
为了防止递归?
当我转过身时RewriteLogLevel,我看到:
[.../initial] (3) [perdir /.../test/] strip per-dir prefix: /.../test/stuff -> stuff [.../initial] (3) [perdir /.../test/] applying pattern '(.*)' to uri 'stuff' [.../initial] (4) [perdir /.../test/] RewriteCond: input='' pattern='!=true' => matched [.../initial] (4) [perdir /.../test/] RewriteCond: input='/test/stuff' pattern='(.*)/' => matched [.../initial] (2) [perdir /.../test/] rewrite 'stuff' -> '/test/foo.php?original=stuff' [.../initial] (5) setting env variable 'did_rewrite' to 'true' [.../initial] (3) split uri=/test/foo.php?original=stuff -> uri=/test/foo.php, args=original=stuff …
是否有可能改变IPython使用的漂亮的打印机?
我想切换默认的漂亮的打印机pprint++,我更喜欢嵌套结构之类的东西:
In [42]: {"foo": [{"bar": 42}, {"bar": 16}] * 3, "bar": [1,2,3,4,5]}
Out[42]:
{'bar': [1, 2, 3, 4, 5],
'foo': [{'bar': 42},
{'bar': 16},
{'bar': 42},
{'bar': 16},
{'bar': 42},
{'bar': 16}]}
In [43]: pprintpp.pprint({"foo": [{"bar": 42}, {"bar": 16}] * 5, "bar": [1,2,3,4,5]})
{
'bar': [1, 2, 3, 4, 5],
'foo': [
{'bar': 42},
{'bar': 16},
{'bar': 42},
{'bar': 16},
{'bar': 42},
{'bar': 16},
{'bar': 42},
{'bar': 16},
{'bar': 42},
{'bar': 16},
],
}
Run Code Online (Sandbox Code Playgroud) 我正在尝试使用np.polyfit一个相当简单的数据集,但它的相关幅度相当大:
和代码:
import numpy as np
import matplotlib as plt
fit = np.polyfit(xvals, yvals, 1)
f = np.poly1d(fit)
plt.scatter(xvals, yvals, color="blue", label="input")
plt.scatter(xvals, f(yvals), color="red", label="fit")
plt.legend()
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我究竟做错了什么?我怎样才能提高合身度?
原始数据:
xvals = array([ 0, 1, 2, 3, 4, 5, 7, 8, 9, 10, 11, 12, 14,
15, 16, 17, 18, 20, 21, 22, 23, 24, 25, 27, 28, 29,
30, 31, 32, 34, 35, 36, 37, 38, 40, 41, 42, 43, 44,
45, 47, 48, 49, 50, 51, 52, …Run Code Online (Sandbox Code Playgroud) 我正在分析一些Flash代码,其中一种占用大量时间的方法是BitmapData.ctor.那是什么错误的?
例如,当我cursor.execute() 按照记录使用时:
>>> from django.db import connection
>>> cur = connection.cursor()
>>> cur.execute("DROP TABLE %s", ["my_table"])
django.db.utils.DatabaseError: near "?": syntax error
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当不使用Django的参数替换时,查询按预期工作:
>>> cur.execute("DROP TABLE my_table")
django.db.utils.DatabaseError: no such table: my_table
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我究竟做错了什么?如何使参数化查询起作用?
笔记:
;并没有帮助%s应该使用,而不是SQLite ?(Django转换%s为?)在Python中,我习惯于能够在代码中的任何位置启动调试器,然后在实时对象(调用方法,类似的东西)上查看.有没有办法,使用NetBeans来做到这一点?
例如,我希望能够突破foo = bar().baz().blamo()并运行bar(),bar().baz()并bar().baz().blamo()看看他们做了什么.
在Python中,这就是我要做的:
...
import pdb; pdb.set_trace()
foo = bar().baz().blamo()
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然后它会给我一个提示,我可以输入内容:
(pdb) bar()
... some objet ...
(pdb) bar() + 42
...
Run Code Online (Sandbox Code Playgroud) 我想在函数内动态创建语法规则.例如,类似于:
fun! DoStuff(word)
syntax match Error '\<'.word.'\>' contained
... other stuff ...
endf
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但是,显然*不起作用.那么......我怎么能这样做?
*:据我所知,Vim脚本仍然是伏都教