On Mac, while xlwings allows you to run multiple instances of Excel, it’s a feature that is not officially supported by Excel for Mac: Unlike on Windows, Excel will not ask you to open a read-only version of a file if it is already open in another instance. This means that you need to watch out yourself so that the same file is not being overwritten from different instances.

On Windows, if you want to change the version of Excel that xlwings talks to, go to Control Panel > Programs and Features and Repair the Office version that you want as default.

Camera focal lengthchart

Only used by xlwings Server: you can provide the name of a function that will be called with the value of the pressed button as argument. The function has to exist on the client side, i.e., in VBA or JavaScript.

True if Excel is in interactive mode. If you set this property to False, Excel blocks all input from the keyboard and mouse (except input to dialog boxes that are displayed by your code). Read/write Boolean. NOTE: Not supported on macOS.

Focal length

Returns or sets a boolean value that determines whether the app is visible. The default leaves the state unchanged or sets visible=True if the object doesn’t exist yet.

Shortfocal length

Turn screen updating off to speed up your script. You won’t be able to see what the script is doing, but it will run faster. Remember to set the screen_updating property back to True when your script ends.

Longer focal lengths correspond to higher magnification and vice-versa. Wide-angle lenses with short focal lengths have low magnification, which means you have to get physically close to an average-size subject to fill the frame. But that also means you can fit large subjects in the frame without having to shoot from a distance. Telephoto lenses with long focal lengths have high magnification, so you can fill the frame with subjects that are further away from the camera.

With long focal lengths, foreground and background objects will often appear to be closer together in the final image. This effect is sometimes called “telephoto compression”, although it is not actually caused by the lens itself. What really happens is that when using a telephoto lens, you will need to be further away from your subjects. So, relative to the distance from the camera to the foreground and background subjects, they actually are closer together. Another way of saying this is that since both the foreground and background objects are at a considerable distance from the camera, their relative sizes in the final image will be closer to reality. When shooting with a wide-angle lens you normally need to get close to the foreground subject so that it is sufficiently large in the frame, which is why more distant objects look comparatively smaller. The difference in apparent perspective is actually a result of how far you are from your subject.

Focal length camera

Writes the values of all key word arguments to the output file according to the template and the variables contained in there (Jinja variable syntax). Following variable types are supported:

Focal length, or focal length range in the case of zooms, will usually be the foremost consideration when choosing a lens for a specific photograph or type of photography. The focal length of a lens determines two characteristics that are very important to photographers: magnification and angle of view.

focallength中文

* Focal length in ( ): equivalent focal length when mounted on interchangeable-lens digital cameras with 35 mm full-frame sensors

The focal length of a lens is defined as the distance from its secondary principal point to its rear focal point when focus is set to infinity. The secondary principal point is one of six “cardinal points” that are used as points of reference in an optical lens (front and rear focal points, primary and secondary nodal points, and primary and secondary principal points). There’s no predefined location for the secondary principal point in a compound lens—it could be somewhere inside the lens barrel or at some point outside the barrel, depending on the design of the lens—so there’s no easy way to accurately measure the focal length of a lens yourself.

Gets or sets the status of the cut or copy mode. Accepts False for setting and returns None, copy or cut when getting the status.

Mac-only, use the full path to the Excel application, e.g. /Applications/Microsoft Office 2011/Microsoft Excel or /Applications/Microsoft Excel

Context manager that allows you to easily change the app’s properties temporarily. Once the code leaves the with block, the properties are changed back to their previous state. Note: Must be used as context manager or else will have no effect. Also, you can only use app properties that you can both read and write.

An app corresponds to an Excel instance and should normally be used as context manager to make sure that everything is properly cleaned up again and to prevent zombie processes. New Excel instances can be fired up like so:

howis a“wide anglefocallength” ora“telephotofocallength” determined?

focallength是什么

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The default value is True. Set this property to False to suppress prompts and alert messages while code is running; when a message requires a response, Excel chooses the default response.

[1] Secondary principal point of lens  [2] Focal length  [3] Angle of view (measured diagonally)  [4] Focal plane (image sensor plane)

Returns None when used with xlwings Server, otherwise the value of the pressed button in lowercase: "ok", "cancel", "yes", "no".

What is focal length oflens

The “Focal length vs. angle of view” comparison illustrates this relationship for both 35 mm full frame and APS-C format cameras.

“Angle of view” describes how much of the scene in front of the camera will be captured by the camera’s sensor. In slightly more technical terms, it is the angular extent of the scene captured on the sensor, measured diagonally. It is important to remember that angle of view is entirely determined by both the focal length of the lens and the format of the camera’s sensor, so the angle of view you get from any given lens will be different on 35 mm full-frame and APS-C format cameras. Different lenses of equal focal length will always have the same angle of view when used with the same-size sensor.

This corresponds to MsgBox in VBA, shows an alert/message box and returns the value of the pressed button. For xlwings Server, instead of returning a value, the function accepts the name of a callback to which it will supply the value of the pressed button.

A dictionary of xlwings.Book parameters, for details see: xlwings.Book. For example: book_settings={'update_links': False}.