units-of-measurement

问题 I'm aware of this post and this library but they didn't help me with these specific cases below. How can I parse measurements like below: I have strings like below; "Square 10 x 3 x 5 mm" "Round 23/22; 24,9 x 12,2 x 12,3" "Square 10x2" "Straight 10x2mm" I'm looking for a Python package or some way to get results like below; >>> a = amazing_parser.parse("Square 10 x 3 x 5 mm") >>> print(a) 10 x 3 x 5 mm Likewise; >>> a = amazing_parser.parse("Round 23/22; 24,9x12,2") >>> print(a) 24,9 x 12,2 I

问题 I'm trying to figure out if there is a good way to manage units in my pandas data. For example, I have a DataFrame that looks like this: length (m) width (m) thickness (cm) 0 1.2 3.4 5.6 1 7.8 9.0 1.2 2 3.4 5.6 7.8 Currently, the measurement units are encoded in column names. Downsides include: column selection is awkward -- df['width (m)'] vs. df['width'] things will likely break if the units of my source data change If I wanted to strip the units out of the column names, is there somewhere

问题 I'm trying to figure out if there is a good way to manage units in my pandas data. For example, I have a DataFrame that looks like this: length (m) width (m) thickness (cm) 0 1.2 3.4 5.6 1 7.8 9.0 1.2 2 3.4 5.6 7.8 Currently, the measurement units are encoded in column names. Downsides include: column selection is awkward -- df['width (m)'] vs. df['width'] things will likely break if the units of my source data change If I wanted to strip the units out of the column names, is there somewhere

问题 I have a numeric JSpinner which accepts values in a specific measuring unit. Now, I'd like to have a special JSpinner behavior: If a user enters a numeric value and appends a specific measuring unit string (e.g. "inch", "pica") then the entered numeric value must be converted into another value (depending on the unit string). This conversion must occur when user leaves the spinner field (focus lost) or if a "commitEdit" occurs in any way. I've tried several variants: Custom document filter,

问题 I realize that you can express relationships with dimensions of units, like [<Measure>] type cc = cm^3 and perform meaningful calculations later. Given some unit of measure type, [<Measure>] type m Is it possible to define a unit in a relationship with a quantity of another unit? For example, // doesn't compile [<Measure>] type mm = 0.001<m> // later let length = 500.0<mm> let length2 = 0.5<m> printfn "%A" (length = length2) // prints true 回答1: In short: no. Units of measure are annotations

问题 I realize that you can express relationships with dimensions of units, like [<Measure>] type cc = cm^3 and perform meaningful calculations later. Given some unit of measure type, [<Measure>] type m Is it possible to define a unit in a relationship with a quantity of another unit? For example, // doesn't compile [<Measure>] type mm = 0.001<m> // later let length = 500.0<mm> let length2 = 0.5<m> printfn "%A" (length = length2) // prints true 回答1: In short: no. Units of measure are annotations

问题 Say I have a set of strings like the following: "5 m^2" "17 sq feet" "3 inches" "89 meters" Is there a Python package which will read such strings, convert them to SI, and return the result in an easily-usable form? For instance: >>> a=dream_parser.parse("17 sq feet") >>> a.quantity 1.5793517 >>> a.type 'area' >>> a.unit 'm^2' 回答1: More recently, pint is a good place to start for most of these. 回答2: Quantulum will do exactly what you described Excerpt from its description: from quantulum

问题 I'm very dubious about datatype of my database, I need to use different unit of measurements because I have different elements and different scales, and I'm sure about the limits used, because I take them from standard elements, but I'm afraid about the variety. Just consider I work with 100 grams of product and take from it all elements, so, I'm sure I can't go over 100 grams for proteins, but i can reach 3500 kilojoule or 3,27 milligrams of iron element. So I need various datatypes I think,

问题 When should I use rem over px? I see a lot of articles saying that I should use REM to respect the user preferences, but the examples always says about font size, not the about the whole style - margin, padding, border, width, height, etc. Took this article of SO as example: Should I use px or rem value units in my CSS? ALL the answers are saying about the font-size, ok, I get it, rem is better for font-size, but what about the other styles? I see that bootstrap uses px to the container class

问题 I would like to convert a transform SVG attribute into a CSS transform . Here it is: <g transform="translate(11.225 164)"/> But CSS requires me to specify units. What is the correct unit to specify? Since it's supposed to be a library, I don't know the width , height or viewport of the <svg> . Thus I can't compute the px or so. 回答1: The default (user) unit is px. One px unit is defined to be equal to one user unit. Thus, a length of "5px" is the same as a length of "5". Per the SVG