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Trending in Stackoverflow

See what the Stackoverflow community is most excited about today.

Date: 2018-01-09

  1. How do I delete (unset) an exported environment variable?

    tags: linux, environment-variables, unset

    967 votes, 3 answers and 547486 views

    \r\n Before installing gnuplot I set the environment variable GNUPLOT_DRIVER_DIR = /home/gnuplot/build/src.\n\nDuring the installation something went wrong; now I want to remove the GNUPLOT_DRIVER_DIR ...\r\n

  2. How can Python iterate over dictionaries with 'for' loops using only the dict keys?

    tags: python, python-2.7, dictionary, key, iteration

    1657 votes, 12 answers and 2233477 views

    \r\n I am a bit puzzled by the following code:\n\nd = {'x': 1, 'y': 2, 'z': 3} \nfor key in d:\n print key, 'corresponds to', d[key]\r\nWhat I don't understand is the key portion. How does Python recognize ...\r\n

  3. A monad is just a monoid in the category of endofunctors, what's the probleⅿ?

    tags: haskell, monads, category-theory, monoids

    570 votes, 5 answers and 107900 views

    \r\n Who first said the following?\r\n A monad is just a monoid in the\n category of endofunctors, what's the\n problem?\r\nAnd on a less important note, is this true and if so could you give an explanation (...\r\n

  4. How do I put the image on the right side of the text in a UIButton?

    tags: ios, user-interface

    185 votes, 22 answers and 95691 views

    \r\n I don't want to use a subview if I can help it. I want a UIButton with a background image, text, and an image in it. Right now when I do that the image is on the left side of the text. The background ...\r\n

  5. Not receiving Google OAuth refresh token

    tags: gdata, gdata-api, access-token

    185 votes, 10 answers and 70120 views

    \r\n I want to get the access token from Google. The Google API says that to get the access token, send the code and other parameters to token generating page, and the response will be a JSON Object like :...\r\n

  6. Rename a table in MySQL

    tags: mysql, database, table-rename

    185 votes, 12 answers and 256295 views

    \r\n Renaming a table is not working in MySQL\n\nRENAME TABLE group TO member;\r\nThe error message is\n\n#1064 - You have an error in your SQL syntax; check the manual that corresponds\n to your MySQL ...\r\n

  7. SQL query to select dates between two dates

    tags: sql, sql-server, tsql, datetime, sql-server-2005

    184 votes, 19 answers and 1195748 views

    \r\n I have a start_date and end_date. I want to get the list of dates in between these two dates. Can anyone help me pointing the mistake in my query.\n\nselect Date,TotalAllowance \nfrom Calculation \nwhere ...\r\n

  8. What is the difference between .NET Core and .NET Standard Class Library project types?

    tags: .net, .net-core, class-library, .net-standard

    250 votes, 7 answers and 44294 views

    \r\n In Visual Studio, there are at least 3 different types of class library you can create:\r\nClass Library (.NET Framework)\nClass Library (.NET Standard)\nClass Library (.NET Core)\r\nWhile the first is what ...\r\n

  9. When to encode space to plus (+) or %20?

    tags: urlencode

    354 votes, 6 answers and 167990 views

    \r\n Sometimes the spaces get URL encoded to the + sign, some other times to %20. What is the difference and why should this happen?\r\n

  10. How to make a SIMPLE C++ Makefile?

    tags: c++, makefile

    201 votes, 8 answers and 272364 views

    \r\n We are required to use a Makefile to pull everything together for our project but our professor never showed us how to.\n\nI only have ONE file, a3driver.cpp.\nThe driver imports a class from a location "...\r\n