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Vim: What's the difference between let and set?

... :set is for setting options, :let for assigning a value to a variable. It happens that the value for an option is linked to the name of the option prepended by a & (the &option-name construct then behaves very similar to "ordinary" variables). So, the following are equ...
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Python argparse mutual exclusive group

... add_mutually_exclusive_group doesn't make an entire group mutually exclusive. It makes options within the group mutually exclusive. What you're looking for is subcommands. Instead of prog [ -a xxxx | [-b yyy -c zzz]], you'd have:...
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Why does this assert throw a format exception when comparing structures?

I'm trying to assert the equality of two System.Drawing.Size structures, and I'm getting a format exception instead of the expected assert failure. ...
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How to properly URL encode a string in PHP?

I'm making a search page, where you type a search query and the form is submitted to search.php?query=your query . What PHP function is the best and that I should use for encoding/decoding the search query? ...
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What's the best way of structuring data on firebase?

I am new to firebase and I want to know what's the best way of structuring data on it. 3 Answers ...
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What do the different readystates in XMLHttpRequest mean, and how can I use them?

XMLHttpRequest has 5 readyState s, and I only use 1 of them (the last one, 4 ). 5 Answers ...
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How to copy from CSV file to PostgreSQL table with headers in CSV file?

I want to copy a CSV file to a Postgres table. There are about 100 columns in this table, so I do not want to rewrite them if I don't have to. ...
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Implementing slicing in __getitem__

I am trying to implement slice functionality for a class I am making that creates a vector representation. 5 Answers ...
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Cleanest and most Pythonic way to get tomorrow's date?

What is the cleanest and most Pythonic way to get tomorrow's date? There must be a better way than to add one to the day, handle days at the end of the month, etc. ...
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WPF Application that only has a tray icon

I am a total WPF newbie and wonder if anyone could give me some pointers how to write an application that starts minimized to tray. The idea is that it periodically fetches an RSS Feed and creates a Toaster-Popup when there are new feeds. ...