GDAL algorithm provider How to do it. Working with Vector Data Let Us Help You. Select one of the folders called plugins within the python folder in either the main user directory or the QGIS program directory.
Python / C API 參考手冊 — Python 說明文件
Python 手冊. Beta: These features are tagged as Beta because the API may change based on user feedback, because the performance needs to improve, or because coverage across operators is not yet complete.
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Parts of the documentation: What's new in Python 2. Indices and tables: Global Module Index quick access to all modules General Index all functions, classes, terms Glossary the most important terms explained Search page search this documentation Complete Table of Contents lists all sections and subsections Meta information: Reporting bugs About the documentation History and License of Python Copyright.
Download Download these documents Docs by version Python 3. The Python Software Foundation is a non-profit corporation. Please donate. Last updated on Jun 19, Found a bug? First, you must make sure that PyQGIS is installed for your platform, and then set up some required system environment variables. In this recipe, we will walk you through the additional steps required beyond the normal QGIS installation to prepare your system for development.
The steps for each platform are provided, which also include the different styles of Linux package managers. The Windows installers install everything you need for Python development, including Python itself. However, on Linux distributions and Mac OS X, you may need to manually install the Python modules for the system installation of Python. On Linux, you have the option to compile from the source or you can just specify the Python QGIS interface to be installed through your package manager.
For Linux distributions based on the Debian Linux package manager, which includes Ubuntu and Debian, use the following command in a shell:.
Now, append the QGIS shared library directory to the runtime search path. Note that this location can vary depending on your particular system configuration:. This recipe uses the default QGIS paths on each platform. The libraries on Windows are stored in a different location than in the case of other platforms. To locate the path, you can check the current working directory of the Python console:. Select Python Console from the Plugins menu, which appears in the lower-right corner of the QGIS application window, as shown in the following screenshot:.
Perform the following steps to find the path needed for this recipe on all the platforms besides Windows:. You can test out ideas or just do some quick automation. In the following steps, we'll open the QGIS Python console, create a vector layer in memory, and display it on the map:. From the Plugins menu, select Python Console. This example uses a memory layer to avoid interacting with any data on disk or a network to keep things simple.
Without this declaration, QGIS will prompt you to choose one. There are three parts or levels of abstraction to create even a single point on the map canvas, as shown here:. First, create a layer that is of the type geometry. Next, set up a data provider to accept the data source. The layer type is memory , meaning that you can define the geometry and the attributes inline in the code rather than in an external data source.
In this recipe, we just define the geometry and skip the defining of any attributes. It provides a script management dialog that allows you to easily load, create, edit, and run scripts for large-scale QGIS automation. Then, run the plugin from the Plugin menu to open the ScriptRunner dialog. Configure a default editor to edit scripts using the following steps:.
Find the gear icon that represents the ScriptRunner Preferences settings dialog box and click on it. Click on the … button to browse to the location of a text editor on your system. Click on the OK button in the Preferences dialog.
In the ScriptRunner dialog, click on the New Script icon, as shown in the following screenshot:. Verify that the new script is loaded in ScriptRunner. Verify that the memory layer polygon was added to the QGIS map, as shown in the following screenshot:.
ScriptRunner is a simple but powerful idea. It allows you to build a library of automation scripts and use them from within QGIS, but without the overhead of building a plugin or a standalone application. Eclipse allows you to have multiple Python interpreters configured for different Python environments. When you install PyDev, it automatically finds the installed system Python installations. This recipe uses Eclipse and PyDev.
You can use the latest version of either package that is supported by your operating system. All platforms besides Windows rely on the system Python interpreter.
The following steps describe how to set up the interpreter on the Windows version of Eclipse:. From the Window menu, select Preferences.
On OS X, you must click on the Eclipse menu to find the preferences menu. In the pane on the left-hand side of the Preferences window, click on the plus sign next to PyDev. From the list of PyDev preferences, select Interpreter Python. In the pane labelled Python Interpreters, click on the New button. When you click on the OK button, Eclipse will attempt to automatically add every Python library it finds to the Python path for this interpreter configuration. We need to control which libraries are added to prevent conflicts.
Click on the Deselect All button and then click on OK :. Eclipse will issue a warning dialog because you haven't selected any core libraries. Click on the Proceed anyways button, as shown here:. Apart from adding the Python interpreter, you must also add the module paths needed by PyQGIS using the following steps.
For each path in the returned lists, click on the New Folder button in Eclipse's Libraries pane for your QGIS interpreter, and browse to that folder until all the paths have been added. If a given folder does not exist on your system, simply ignore it, as shown here:. The following steps will allow Eclipse to suggest the possible methods and properties of QGIS objects as you type; this feature is known as autocomplete :.
Click on the New button. In the Builtin to add dialog, type qgis :. The following is an example from a Windows machine:. Eclipse and PyDev use only the information you provide to run a script in the Eclipse workspace. This approach is very similar to the popular Python tool virtualenv , which provides a clean environment when writing and debugging code to ensure that you don't waste time troubleshooting issues caused by the environment. Kindle Cloud Reader Read instantly in your browser. Customers also viewed these products.
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Library Reference keep this under your pillow. Language Reference describes syntax and language elements. Python Setup and Usage how to use Python on different platforms. Distributing Python Modules publishing modules for installation by others. FAQs frequently asked questions with answers! Global Module Index quick access to all modules. General Index all functions, classes, terms. Glossary the most important terms explained.
Search page search this documentation. Complete Table of Contents lists all sections and subsections. This document is for an old version of Python that is no longer supported. You should upgrade and read the Python documentation for the current stable release. Navigation index modules Python » Python 2. Python 2. Return time object with same hour, minute, second and microsecond.
Return time object with same hour, minute, second, microsecond, and tzinfo members. If datetime instance d is naive, this is the same as d. Time Object replace [hour[, minute[, second[, microsecond[, tzinfo]]]]] Return a time with the same value, except for those members given new values by whichever keyword arguments are specified.
Read n items as machine values from the file object f and append them to the end of the array. Appends items from the string, interpreting the string as an array of machine values as if it had been read from a file using the fromfile method. Extends this array with data from the given unicode string.
Write all items as machine values to the file object f. Convert the array to an ordinary list with the same items. Convert the array to an array of machine values and return the string representation the same sequence of bytes that would be written to a file by the tofile method. Return fmod x, y , as defined by the platform C library. Return the mantissa and exponent of x as the pair m, e.
Return an accurate floating point sum of values in the iterable. Check if the float x is positive or negative infinity. Return the Real value x truncated to an Integral usually a long integer.
With one argument, return the natural logarithm of x to base e. Hyperbolic Functions acosh x Return the inverse hyperbolic cosine of x. Constants math. Random Functions betavariate alpha,beta Beta distribution.