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Can I set background image and opacity in the same property?

... Two methods: Convert to PNG and make the original image 0.2 opacity (Better method) have a <div> that is position: absolute; before #main and the same height as #main, then apply the background-image and opacity: 0.2; filter: alpha(opacity=20);. ...
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Adding new column to existing DataFrame in Python pandas

... 1091 Use the original df1 indexes to create the series: df1['e'] = pd.Series(np.random.randn(sLeng...
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Adding a column to a data.frame

...p <- as.factor(your.df$group) no h_freq h_freqsq group 1 1 0.40998238 0.06463876 1 2 2 0.98086928 0.33093795 1 3 3 0.28908651 0.74077119 1 4 4 0.10476768 0.56784786 1 5 1 0.75478995 0.60479945 2 6 2 0.26974011 0.95231761 2 7 3 0.53676266 0.74370154...
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Configure Flask dev server to be visible across the network

...s is Flask specific, but when I run an app in dev mode ( http://localhost:5000 ), I cannot access it from other machines on the network (with http://[dev-host-ip]:5000 ). With Rails in dev mode, for example, it works fine. I couldn't find any docs regarding the Flask dev server configuration. Any i...
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How to drop rows of Pandas DataFrame whose value in a certain column is NaN

... AMC 2,22966 gold badges1010 silver badges2828 bronze badges answered Nov 16 '12 at 9:34 eumiroeumiro 1...
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How to select rows with one or more nulls from a pandas DataFrame without listing columns explicitly

I have a dataframe with ~300K rows and ~40 columns. I want to find out if any rows contain null values - and put these 'null'-rows into a separate dataframe so that I could explore them easily. ...
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How do I list all versions of a gem available at a remote site?

... 205 Well, it was easier than I thought (well, not really, let's say as easy as it should be): gem ...
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How to change the output color of echo in Linux

... 30 Answers 30 Active ...
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How does Dijkstra's Algorithm and A-Star compare?

... answered Aug 26 '09 at 5:18 leizleiz 3,63622 gold badges2020 silver badges1616 bronze badges ...
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Extracting specific columns in numpy array

... | edited Aug 23 at 10:39 cs95 231k6060 gold badges391391 silver badges456456 bronze badges answere...