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Using Python 3 in virtualenv
... the default version of Python (2.7). On one project, I need to use Python 3.4.
22 Answers
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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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Pandas selecting by label sometimes return Series, sometimes returns DataFrame
... other ways, but in my opinion this is the cleanest.
In [2]: type(df.loc[[3]])
Out[2]: pandas.core.frame.DataFrame
In [3]: type(df.loc[[1]])
Out[3]: pandas.core.frame.DataFrame
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Changing the selected option of an HTML Select element
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329
Vanilla JavaScript
Using plain old JavaScript:
var val = "Fish";
var sel = document.get...
How to pass command line arguments to a rake task
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389
Options and dependencies need to be inside arrays:
namespace :thing do
desc "it does a thing...
What is the most efficient/elegant way to parse a flat table into a tree?
...id, descendant_id) VALUES
(1,1), (1,2), (1,4), (1,6),
(2,2), (2,4),
(3,3), (3,5),
(4,4),
(5,5),
(6,6);
Now you can get a tree starting at node 1 like this:
SELECT f.*
FROM FlatTable f
JOIN ClosureTable a ON (f.id = a.descendant_id)
WHERE a.ancestor_id = 1;
The output (in MySQL c...
Convert floats to ints in Pandas?
...f= pd.DataFrame(range(5), columns=['a'])
df.a = df.a.astype(float)
df
Out[33]:
a
0 0.0000000
1 1.0000000
2 2.0000000
3 3.0000000
4 4.0000000
pd.options.display.float_format = '{:,.0f}'.format
df
Out[35]:
a
0 0
1 1
2 2
3 3
4 4
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How do you run multiple programs in parallel from a bash script?
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psmearspsmears
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Python - Count elements in list [duplicate]
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399
len()
>>> someList=[]
>>> print len(someList)
0
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深入解析ATL - 文档下载 - 清泛网 - 专注IT技能提升
...第1章 你好，ATL
1.1 什么是ATL
1.2 创建COM服务器
1.3 插入COM类
1.4 添加属性和方法
1.5 实现附加接口
1.6 脚本支持
1.7 添加永久性
1.8 添加和激发事件显示全部信息第2版序
第1版序
前言
致谢
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