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Get list from pandas DataFrame column headers
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edited Apr 3 '19 at 9:51
cs95
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Retrieve only the queried element in an object array in MongoDB collection
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db.test.find({"shapes.color": "red"}, {_id: 0, 'shapes.$': 1});
MongoDB 3.2 Update
Starting with the 3.2 release, you can use the new $filter aggregation operator to filter an array during projection, which has the benefit of including all matches, instead of just the first one.
db.test.aggrega...
Difference between “git checkout ” and “git checkout -- ”
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edited Sep 8 '16 at 13:47
answered Jul 3 '11 at 4:51
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ImageConvertor 扩展：免费图像转换器，支持JPG/PNG/WEBP格式转换和图像处...
...的图像处理功能。
包名：com.kumaraswamy.convertor.aix
版本：3.9
文件大小：6.9 KB
下载链接
com.kumaraswamy.convertor.aix
ImageConvertor.aia - 示例项目
功能概述
ImageConvertor 扩展提供了全面的图像处理和转...
How to get different colored lines for different plots in a single figure?
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432
Matplotlib does this by default.
E.g.:
import matplotlib.pyplot as plt
import numpy as np
x ...
Accessing dict_keys element by index in Python3
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Call list() on the dictionary instead:
keys = list(test)
In Python 3, the dict.keys() method returns a dictionary view object, which acts as a set. Iterating over the dictionary directly also yields keys, so turning a dictionary into a list results in a list of all the keys:
>>> te...
How to detect the currently pressed key?
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163
if ((Control.ModifierKeys & Keys.Shift) != 0)
This will also be true if Ctrl+Shift is dow...
Listing all permutations of a string/integer
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I found the pseudocode on http://www.programmersheaven.com/mb/Algorithms/369713/369713/permutation-algorithm-help/:
makePermutations(permutation) {
if (length permutation < required length) {
for (i = min digit to max digit) {
if (i not in permutation) {
makePermutations(per...