How to solve could not create the virtual machine error of Java Virtual Machine Launcher?
rror: Solution: Remove extra hyphen ‘-‘
Pythonic way to create a long multi-line string
Are you talking about multi-line strings? Easy, use triple quotes to start and end them. You can use single quotes too (3 of them of course at start and end) and treat the resulting string s just like any other string. NOTE: Just as with any string, anything between the starting and ending quotes becomes part of … Read more
Best way to convert string to bytes in Python 3?
If you look at the docs for bytes, it points you to bytearray: bytearray([source[, encoding[, errors]]]) Return a new array of bytes. The bytearray type is a mutable sequence of integers in the range 0 <= x < 256. It has most of the usual methods of mutable sequences, described in Mutable Sequence Types, as well as … Read more
ggplot2 line chart gives “geom_path: Each group consist of only one observation. Do you need to adjust the group aesthetic?”
You only have to add group = 1 into the ggplot or geom_line aes(). For line graphs, the data points must be grouped so that it knows which points to connect. In this case, it is simple — all points should be connected, so group=1. When more variables are used and multiple lines are drawn, the grouping … Read more
Unknown column in ‘field list’ error on MySQL Update query
Try using different quotes for “y” as the identifier quote character is the backtick (“`”). Otherwise MySQL “thinks” that you point to a column named “y”. See also MySQL 5 Documentation
Accessing the index in ‘for’ loops?
Using an additional state variable, such as an index variable (which you would normally use in languages such as C or PHP), is considered non-pythonic. The better option is to use the built-in function enumerate(), available in both Python 2 and 3:
When should I use uuid.uuid1() vs. uuid.uuid4() in python?
uuid1() is guaranteed to not produce any collisions (under the assumption you do not create too many of them at the same time). I wouldn’t use it if it’s important that there’s no connection between the uuid and the computer, as the mac address gets used to make it unique across computers. You can create duplicates by creating … Read more
Python division
You’re using Python 2.x, where integer divisions will truncate instead of becoming a floating point number. You should make one of them a float: or from __future__ import division, which the forces / to adopt Python 3.x’s behavior that always returns a float.
How do I comment out a block of tags in XML?
You can use that style of comment across multiple lines (which exists also in HTML)
How do I redirect to another webpage?
One does not simply redirect using jQuery jQuery is not necessary, and window.location.replace(…) will best simulate an HTTP redirect. window.location.replace(…) is better than using window.location.href, because replace() does not keep the originating page in the session history, meaning the user won’t get stuck in a never-ending back-button fiasco. If you want to simulate someone clicking on a link, use location.href If you … Read more