Welcome! This is the documentation for ezdxf 0.8.8, last updated Apr 03, 2018.


  • ezdxf is a Python package to create new DXF files and read/modify/write existing DXF files
  • the intended audience are developers
  • requires Python 2.7 or later, runs on CPython and pypy, maybe on IronPython and Jython
  • OS independent
  • additional required packages: pyparsing
  • MIT-License
  • read/write/new support for DXF versions: R12, R2000, R2004, R2007, R2010, R2013 and R2018
  • additional read support for DXF versions R13/R14 (upgraded to R2000)
  • additional read support for older DXF versions than R12 (upgraded to R12)
  • preserves third-party DXF content
  • additional Fast DXF R12 File/Stream Writer, that creates just an ENTITIES section with support for the basic DXF entities


Documentation of development version at https://ezdxf.mozman.at/docs

Documentation of latest release at http://ezdxf.readthedocs.io/

Source Code: http://github.com/mozman/ezdxf.git

Issue Tracker at GitHub: http://github.com/mozman/ezdxf/issues

Questions and Feedback at Google Groups



Version 0.8.8 - 2018-04-02

  • Release notes: https://ezdxf.mozman.at/release-v0-8-8.html
  • NEW: read/write support for GEODATA entity
  • NEW: support for extension dictionaries
  • NEW: add_spline_control_frame(), create and add B-spline control frame from fit points
  • NEW: add_spline_approx(), approximate B-spline by a reduced count of control points
  • NEW: ezdxf.setup_linetypes(dwg), setup standard line types
  • NEW: ezdxf.setup_styles(dwg), setup standard text styles
  • NEW: LWPolyline.vertices() yields all points as (x, y) tuples in OCS, LWPolyline.dxf.elevation is the z-axis value
  • NEW: LWPolyline.vertices_in_wcs() yields all points as (x, y, z) tuples in WCS
  • NEW: basic __str__() and __repr__() support for DXF entities, returns just DXF type and handle
  • NEW: bulge related function in module ezdxf.algebra.bulge
  • NEW: Object Coordinate System support by DXFEntity.ocs() and OCS() class in module ezdxf.algebra
  • NEW: User Coordinate System support by UCS() class in module ezdxf.algebra
  • CHANGE: DXFEntity.set_app_data() and Entity.set_xdata accept also list of tuples as tags, DXFTag() is not required
  • BUGFIX: entity structure validator excepts group code >= 1000 before XDATA section (used in AutoCAD Civil 3D and AutoCAD Map 3D)

Version 0.8.7 - 2018-03-04

  • Release notes: https://ezdxf.mozman.at/release-v0-8-7.html
  • NEW: entity.get_layout() returns layout in which entity resides or None if unassigned
  • NEW: copy any DXF entity by entity.copy() without associated layout, add copy to any layout you want, by layout.add_entity().
  • NEW: copy entity to another layout by entity.copy_to_layout(layout)
  • NEW: move entity from actual layout to another layout by entity.move_to_layout(layout)
  • NEW: support for splines by control points: add_open_spline(), add_closed_spline(), add_rational_spline(), add_closed_rational_spline()
  • NEW: bspline_control_frame() calculates B-spline control points from fit points, but not the same as AutoCAD
  • NEW: R12Spline add-on, 2d B-spline with control frame support by AutoCAD, but curve is just an approximated POLYLINE
  • NEW: added entity.get_flag_state() and entity.set_flag_state() for easy access to binary coded flags
  • NEW: set new $FINGERPRINTGUID for new drawings
  • NEW: set new $VERSIONGUID on saving a drawing
  • NEW: improved IMAGE support, by adding RASTERVARIABLES entity, use Drawing.set_raster_variables(frame, quality, units)
  • BUGFIX: closing user defined image boundary path automatically, else AutoCAD crashes

Version 0.8.6 - 2018-02-17

  • Release notes: https://ezdxf.mozman.at/release-v0-8-6.html
  • NEW: ezdxf project website: https://ezdxf.mozman.at/
  • CHANGE: create all missing tables of the TABLES sections for DXF R12
  • BUGFIX: entities on new layouts will be saved
  • NEW: Layout.page_setup() and correct ‘main’ viewport for DXF R2000+; For DXF R12 page_setup() exists, but does not provide useful results. Page setup for DXF R12 is still a mystery to me.
  • NEW: Table(), MText(), Ellipse(), Spline(), Bezier(), Clothoid(), LinearDimension(), RadialDimension(), ArcDimension() and AngularDimension() composite objects from dxfwrite as add-ons, these add-ons support DXF R12
  • NEW: geometry builder as add-ons: MeshBuilder(), MeshVertexMerger(), MengerSponge(), SierpinskyPyramid(), these add-ons require DXF R2000+ (MESH entity)
  • BUGFIX: fixed invalid implementation of context manager for r12writer

Version 0.8.5 - 2018-01-28

  • Release notes: https://ezdxf.mozman.at/release-v0-8-5.html
  • CHANGE: block names are case insensitive ‘TEST’ == ‘Test’ (like AutoCAD)
  • CHANGE: table entry (layer, linetype, style, dimstyle, …) names are case insensitive ‘TEST’ == ‘Test’ (like AutoCAD)
  • CHANGE: raises DXFInvalidLayerName() for invalid characters in layer names: <>/”:;?*|=`
  • CHANGE: audit process rewritten
  • CHANGE: skip all comments, group code 999
  • CHANGE: removed compression for unused sections (THUMBNAILSECTION, ACDSDATA)
  • NEW: write DXF R12 files without handles: set dwg.header[‘$HANDLING’]=0, default value is 1
  • added subclass marker filter for R12 and prior files in legacy_mode=True (required for malformed DXF files)
  • removed special check for Leica Disto Unit files, use readfile(filename, legacy_mode=True) (malformed DXF R12 file, see previous point)

Version 0.8.4 - 2018-01-14

  • Release notes: https://ezdxf.mozman.at/release-v0-8-4.html
  • NEW: Support for complex line types with text or shapes
  • NEW: DXF file structure validator at SECTION level, tags outside of sections will be removed
  • NEW: Basic read support for DIMENSION
  • CHANGE: improved exception management, in the future ezdxf should only raise exceptions inherited from DXFError for DXF related errors, previous exception classes still work
    • DXFValueError(DXFError, ValueError)
    • DXFKeyError(DXFError, KeyError)
    • DXFAttributeError(DXFError, AttributeError)
    • DXFIndexError(DXFError, IndexError)
    • DXFTableEntryError(DXFValueError)
  • speedup low level tag reader around 5%, and speedup tag compiler around 5%

Version 0.8.3 - 2018-01-02

  • CHANGE: Lwpolyline - suppress yielding z coordinates if they exists (DXFStructureError: z coordinates are not defined in the DXF standard)
  • NEW: setup creates a script called ‘dxfpp’ (DXF Pretty Printer) in the Python script folder
  • NEW: basic support for DXF format AC1032 introduced by AutoCAD 2018
  • NEW: ezdxf use logging and writes all logs to a logger called ‘ezdxf’. Logging setup is the domain of the application!
  • NEW: warns about multiple block definitions with the same name in a DXF file. (DXFStructureError)
  • NEW: legacy_mode parameter in ezdxf.read() and ezdxf.readfile(): tries do fix coordinate order in LINE entities (10, 11, 20, 21) by the cost of around 5% overall speed penalty at DXF file loading

Version 0.8.2 - 2017-05-01

  • NEW: Insert.delete_attrib(tag) - delete ATTRIB entities from the INSERT entity
  • NEW: Insert.delete_all_attribs() - delete all ATTRIB entities from the INSERT entity
  • BUGFIX: setting attribs_follow=1 at INSERT entity before adding an attribute entity works

Version 0.8.1 - 2017-04-06

  • NEW: added support for constant ATTRIB/ATTDEF to the INSERT (block reference) entity
  • NEW: added ATTDEF management methods to BlockLayout (has_attdef, get_attdef, get_attdef_text)
  • NEW: added (read/write) properties to ATTDEF/ATTRIB for setting flags (is_const, is_invisible, is_verify, is_preset)

Version 0.8.0 - 2017-03-28

  • added groupby(dxfattrib=’‘, key=None) entity query function, it is supported by all layouts and the query result container: Returns a dict, where entities are grouped by a dxfattrib or the result of a key function.
  • added ezdxf.audit() for DXF error checking for drawings created by ezdxf - but not very capable yet
  • dxfattribs in factory functions like add_line(dxfattribs=…), now are copied internally and stay unchanged, so they can be reused multiple times without getting modified by ezdxf.
  • removed deprecated Drawing.create_layout() -> Drawing.new_layout()
  • removed deprecated Layouts.create() -> Layout.new()
  • removed deprecated Table.create() -> Table.new()
  • removed deprecated DXFGroupTable.add() -> DXFGroupTable.new()
  • BUFIX in EntityQuery.extend()

Version 0.7.9 - 2017-01-31

  • BUGFIX: lost data if model space and active layout are called *MODEL_SPACE and *PAPER_SPACE

Version 0.7.8 - 2017-01-22

  • BUGFIX: HATCH accepts SplineEdges without defined fit points
  • BUGFIX: fixed universal line ending problem in ZipReader()
  • Moved repository to GitHub: https://github.com/mozman/ezdxf.git

Version 0.7.7 - 2016-10-22

  • NEW: repairs malformed Leica Disto DXF R12 files, ezdxf saves a valid DXF R12 file.
  • NEW: added Layout.unlink(entity) method: unlinks an entity from layout but does not delete entity from the drawing database.
  • NEW: added Drawing.add_xref_def(filename, name) for adding external reference definitions
  • CHANGE: renamed parameters for EdgePath.add_ellipse() - major_axis_vector -> major_axis; minor_axis_length -> ratio to be consistent to the ELLIPSE entity
  • UPDATE: Entity.tags.new_xdata() and Entity.tags.set_xdata() accept tuples as tags, no import of DXFTag required
  • UPDATE: EntityQuery to support both ‘single’ and “double” quoted strings - Harrison Katz <harrison@neadwerx.com>
  • improved DXF R13/R14 compatibility

Version 0.7.6 - 2016-04-16

  • NEW: r12writer.py - a fast and simple DXF R12 file/stream writer. Supports only LINE, CIRCLE, ARC, TEXT, POINT, SOLID, 3DFACE and POLYLINE. The module can be used without ezdxf.
  • NEW: Get/Set extended data on DXF entity level, add and retrieve your own data to DXF entities
  • NEW: Get/Set app data on DXF entity level (not important for high level users)
  • NEW: Get/Set/Append/Remove reactors on DXF entity level (not important for high level users)
  • CHANGE: using reactors in PdfDefinition for well defined UNDERLAY entities
  • CHANGE: using reactors and IMAGEDEF_REACTOR for well defined IMAGE entities
  • BUGFIX: default name=None in add_image_def()

Version 0.7.5 - 2016-04-03

  • NEW: Drawing.acad_release property - AutoCAD release number for the drawing DXF version like ‘R12’ or ‘R2000’
  • BUGFIX: fixed broken layout setup in repair routine
  • BUGFIX: support for utf-8 encoding on saving, DXF R2007 and later is saved with UTF-8 encoding
  • CHANGE: Drawing.add_image_def(filename, size_in_pixel, name=None), renamed key to name and set name=None for auto-generated internal image name
  • CHANGE: argument order of Layout.add_image(image_def, insert, size_in_units, rotation=0., dxfattribs=None)

Version 0.7.4 - 2016-03-13

  • NEW: support for DXF entity IMAGE (work in progress)
  • NEW: preserve leading file comments (tag code 999)
  • NEW: writes saving and upgrading comments when saving DXF files; avoid this behavior by setting options.store_comments = False
  • NEW: ezdxf.new() accepts the AutoCAD release name as DXF version string e.g. ezdxf.new(‘R12’) or R2000, R2004, R2007, …
  • NEW: integrated acadctb.py module from my dxfwrite package to read/write AutoCAD .ctb config files; no docs so far
  • CHANGE: renamed Drawing.groups.add() to new() for consistent name schema for adding new items to tables (public interface)
  • CHANGE: renamed Drawing.<tablename>.create() to new() for consistent name schema for adding new items to tables, this applies to all tables: layers, styles, dimstyles, appids, views, viewports, ucs, block_records. (public interface)
  • CHANGE: renamed Layouts.create() to new() for consistent name schema for adding new items to tables (internal interface)
  • CHANGE: renamed Drawing.create_layout() to new_layout() for consistent name schema for adding new items (public interface)
  • CHANGE: renamed factory method <layout>.add_3Dface() to add_3dface()
  • REMOVED: logging and debugging options
  • BUGFIX: fixed attribute definition for align_point in DXF entity ATTRIB (AC1015 and newer)
  • Cleanup DXF template files AC1015 - AC1027, file size goes down from >60kb to ~20kb

Version 0.7.3 - 2016-03-06

  • Quick bugfix release, because ezdxf 0.7.2 can damage DXF R12 files when saving!!!
  • NEW: improved DXF R13/R14 compatibility
  • BUGFIX: create CLASSES section only for DXF versions newer than R12 (AC1009)
  • TEST: converted a bunch of R8 (AC1003) files to R12 (AC1009), AutoCAD didn’t complain
  • TEST: converted a bunch of R13 (AC1012) files to R2000 (AC1015), AutoCAD didn’t complain
  • TEST: converted a bunch of R14 (AC1014) files to R2000 (AC1015), AutoCAD didn’t complain

Version 0.7.2 - 2016-03-05

  • NEW: reads DXF R13/R14 and saves content as R2000 (AC1015) - experimental feature, because of the lack of test data
  • NEW: added support for common DXF attribute line weight
  • NEW: POLYLINE, POLYMESH - added properties is_closed, is_m_closed, is_n_closed
  • BUGFIX: MeshData.optimize() - corrected wrong vertex optimization
  • BUGFIX: can open DXF files without existing layout management table
  • BUGFIX: restore module structure ezdxf.const

Version 0.7.1 - 2016-02-21

  • Supported/Tested Python versions: CPython 2.7, 3.4, 3.5, pypy 4.0.1 and pypy3 2.4.0
  • NEW: read legacy DXF versions older than AC1009 (DXF R12) and saves it as DXF version AC1009.
  • NEW: added methods is_frozen(), freeze(), thaw() to class Layer()
  • NEW: full support for DXF entity ELLIPSE (added add_ellipse() method)
  • NEW: MESH data editor - implemented add_face(vertices), add_edge(vertices), optimize(precision=6) methods
  • BUGFIX: creating entities on layouts works
  • BUGFIX: entity ATTRIB - fixed halign attribute definition
  • CHANGE: POLYLINE (POLYFACE, POLYMESH) - on layer change also change layer of associated VERTEX entities

Version 0.7.0 - 2015-11-26

  • Supported Python versions: CPython 2.7, 3.4, pypy 2.6.1 and pypy3 2.4.0
  • NEW: support for DXF entity HATCH (solid fill, gradient fill and pattern fill), pattern fill with background color supported
  • NEW: support for DXF entity GROUP
  • NEW: VIEWPORT entity, but creating new viewports does not work as expected - just for reading purpose.
  • NEW: support for new common DXF attributes in AC1018 (AutoCAD 2004): true_color, color_name, transparency
  • NEW: support for new common DXF attributes in AC1021 (AutoCAD 2007): shadow_mode
  • NEW: extended custom vars interface
  • NEW: dxf2html - added support for custom properties in the header section
  • NEW: query() supports case insensitive attribute queries by appending an ‘i’ to the query string, e.g. ‘*[layer==”construction”]i’
  • NEW: Drawing.cleanup() - call before saving the drawing but only if necessary, the process could take a while.
  • BUGFIX: query parser couldn’t handle attribute names containing ‘_’
  • CHANGE: renamed dxf2html to pp (pretty printer), usage: py -m ezdxf.pp yourfile.dxf (generates yourfile.html in the same folder)
  • CHANGE: cleanup file structure

Indices and tables