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if/else in a list comprehension
How can I do the following in Python?
11 Answers
11
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Deleting queues in RabbitMQ
...s, you may need to install them first.
On Ubuntu:
$ sudo apt-get install python-pip git-core
On Debian:
$ sudo apt-get install python-setuptools git-core
$ sudo easy_install pip
On Windows: To install easy_install, run the MS Windows Installer for setuptools
> easy_install pip
> pip in...
C++常用排序算法汇总 - C/C++ - 清泛网 - 专注C/C++及内核技术
...快速排序
* 不稳定排序，O{nlogn} ~ O{n^2}
* 适合排序大量数据
* 设最左边为基准数
* 右边往左找一个比基准数小的
* 左边往右找一个比基准数大的，和上一步交换
* 碰头后和基准数交换
*
* https://www.tsingfun.com
*************...
Named string formatting in C#
...ues.
var Stuff = new Dictionary<string, object> {
{ "language", "Python" },
{ "#", 2 }
};
var Formatter = new DictionaryFormatProvider();
// Interpret {0:x} where {0}=IDictionary and "x" is hash key
Console.WriteLine string.Format(Formatter, "{0:language} has {0:#} quote types", Stuff)...
What are the rules for evaluation order in Java?
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Am I correct that C++ doesn't guarantee this? What about Python?
– Neil G
Jul 23 '11 at 21:05
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How do I get the path of a process in Unix / Linux
...ath /proc to get the folder you hopefully need.
Here's a short example in Python:
import os
print os.path.join('/proc', str(os.getpid()))
Here's the example in ANSI C as well:
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
int
main(in...
Subprocess changing directory
...g cd .. in a child shell process using subprocess won't change your parent Python script's working directory i.e., the code example in @glglgl's answer is wrong. cd is a shell builtin (not a separate executable), it can change the directory only in the same process.
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Is there YAML syntax for sharing part of a list or map?
...<<", nor the phrase "key type". The << syntax does work in the Python yaml package though. Do you know where I can find out more about these sorts of extra features?
– Ben
Mar 2 '12 at 0:18
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Creating dataframe from a dictionary where entries have different lengths
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In Python 3.x:
import pandas as pd
import numpy as np
d = dict( A = np.array([1,2]), B = np.array([1,2,3,4]) )
pd.DataFrame(dict([ (k,pd.Series(v)) for k,v in d.items() ]))
Out[7]:
A B
0 1 1
1 2 2
2 NaN 3
3 N...
Converting a Pandas GroupBy output from Series to DataFrame
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Is this also true in Python 3? I'm finding a groupby function returning the pandas.core.groupby.DataFrameGroupBy object, not pandas.core.frame.DataFrame.
– Adrian Keister
Sep 10 '18 at 17:31
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