Version 0.31 (18 May 2023)

• Many improvements to code style and formatting, and the documentation

• #555 - Fix problem when writing with changed data (different number of depths)

• #554 / #556 - Enable DLM (delimiter) TAB

• #552 - Remove or replace cchardet with chardet

• #530 - Detect hyphens in data section and adjust regexp_subs as needed

• #527 - Remove deprecated functions from las.py: add_curve_raw(), add_curve(), and to_json_old()

• Fix #322 - provide a way to consistently retrieve header items which may
  or may not be present in the header:

  If you try ordinary item-style access,
  as is normal in Python, a KeyError exception will be raised if it is missing:

  >>> permit = las.well['PRMT']
  Traceback (most recent call last):
    File "<stdin>", line 1, in <module>
    File "c:\devapps\kinverarity\projects\lasio\lasio\las_items.py", line 313, in __getitem__
      raise KeyError("%s not in %s" % (key, self.keys()))
  KeyError: "PRMT not in ['STRT', 'STOP', 'STEP', 'NULL', 'COMP', 'WELL', 'FLD', 'LOC', 'PROV', 'SRVC', 'DATE', 'UWI']"

  A better pattern is to use the lasio.SectionItems.get method, which
  allows you to specify a default value in the case of it missing:

  >>> permit = las.well.get('PRMT', 'unknown')
  >>> permit
  HeaderItem(mnemonic="PRMT", unit="", value="unknown", descr="")

  You can use the add=True keyword argument if you would like this
  header item to be added, as well as returned:

  >>> permit = las.well.get('PRMT', 'unknown', add=True)
  >>> las.well
  [HeaderItem(mnemonic="STRT", unit="M", value="0.05", descr="FIRST INDEX VALUE"),
  HeaderItem(mnemonic="STOP", unit="M", value="136.6", descr="LAST INDEX VALUE"),
  HeaderItem(mnemonic="STEP", unit="M", value="0.05", descr="STEP"),
  HeaderItem(mnemonic="NULL", unit="", value="-99999", descr="NULL VALUE"),
  HeaderItem(mnemonic="COMP", unit="", value="", descr="COMP"),
  HeaderItem(mnemonic="WELL", unit="", value="Scorpio E1", descr="WELL"),
  HeaderItem(mnemonic="FLD", unit="", value="", descr=""),
  HeaderItem(mnemonic="LOC", unit="", value="Mt Eba", descr="LOC"),
  HeaderItem(mnemonic="SRVC", unit="", value="", descr=""),
  HeaderItem(mnemonic="CTRY", unit="", value="", descr=""),
  HeaderItem(mnemonic="STAT", unit="", value="SA", descr="STAT"),
  HeaderItem(mnemonic="CNTY", unit="", value="", descr=""),
  HeaderItem(mnemonic="DATE", unit="", value="15/03/2015", descr="DATE"),
  HeaderItem(mnemonic="UWI", unit="", value="6038-187", descr="WUNT"),
  HeaderItem(mnemonic="PRMT", unit="", value="unknown", descr="")]

Version 0.30 (12 May 2022)

• Fixes for #446 (Implement a numpy-based reader for the data section; #452) and #444 (Provide a way to benchmark speed performance of LASFile.read; #449). This leads to a big improvement in speed (e.g. from 1091 msec to 341 msec for
  a large sample file).
• Fixes for #439 (Data section containing non-numeric chars is parsed entirely as str) and #227 (NULL value replacing valid value in DEPT) by allowing different data types for different columns (PRs #459, #460, #461)
• Partially fix #375 (allow writing mnemonics in ~ASCII line; PRs #466, #471, #465)
• Partial fix for #265 (Parse comma-delimited ~ASCII sections; #485)
• Fix #83 (LAS file with more curves defined in ~C section than available in ~A section; #480)
• Improve visibility and access to the Code of Conduct (#469)
• Fix #453 (rounding issues when writing LAS file) (#455)
• Fix #268 (remove side-effects from writer) (#447, #451)
• Documentation updates (#475, #477, #481, #501, #498, #500)
• Fix #473 (Header lines without a period are discarded unnecessarily)
• Fix #472 (Detect and raise IOError exception for LiDAR files; #482)
• Fix #483 (perfomance decrease in DEBUG logging level; #484)
• Fix #478 (:1 :2 should only be appended to mnemonics when using LASFile.read) with #479:
  Add update_curve and replace_curve_item methods to LASFile
• Fix #490 (LAS 2.1 reading error; #491)
• Fix #486 (Adding a citation file, and maybe a DOI; #487)
• Fix #392 (ignore_comments not mentioned in documentation; #495)
• Fix #332: Describe default read_policies in docstring, with #489
• Fix #502 (NumPy type conversion alias deprecation; #503)
• minor performance improvements (#470, )

Version 0.29 (14 April 2021)

• Fix #404 (lasio changes STEP with imprecise floating-point number behaviour; #432)
• Add option len_numeric_field=-1, lhs_spacer=" ", and spacer=" " to writer.py:write (see #412; PR #418)
• Fix #271 (Read quoted strings in data section properly; #423)
• Fix #427 (Change null_policy to handle small non-zero values; #429)
• Fix #417 (Fix parsing for empty ~Other section; #430)
• Fix #402 (fixes issue when unit starts with dot; #403)
• Fix #395 (Update doc examples to reflect new HeaderItem repr; #410)
• Fix #426 (Update urllib.request to be the preferred urllib; #428)
• Add check for pushed tag version to version tests (#396)
• Update GitHub Action Python CI testing (#399, #400)
• Improve las_items.py:HeaderItem.__repr__ truncation logic (#397)
• Remove codecs import (unused) and fix typo (#406)
• Exclude LAS files from GitHubs Language Stats (#411)
• Re-add try-except check around call to reader.read_data_section_iterative() (#401)
• Remove reader.py:read_file_contents - unused code (see #401; #393)
• Add test for timestring with colon in ~Well section (see #419 - PR #420)
• Fix SyntaxWarning in writer.py (#425)
• Add bugfix and feature request issue templates to GitHub repository
• Apply black code style to all Python files (#438, #398)
• Update demo notebook for using logging levels with current behaviour
• Update contributing guide (#437, #441)

Version 0.28 (12 September 2020)

• Major re-write of reader code working towards LAS 3.0 support (#327; #347, #345, #353, #355, #358, #367, #368, #369)
• Fix #377 (writing "None" as the value instead of ""; #377)
• Fix #373 (enable GitHub Actions CI testing on MacOS, Windows, Ubuntu; #374, #387)
• Fix #363 (parse composite units such as "1000 lbf" correctly; #390)
• Fix #319 (allow skipping comment lines in data sections; #391)
• Avoid unnecessary exceptions on reading LAS 3.0 data sections (#385)
• Fix broken ReadTheDocs build

Version 0.27 (4 September 2020)

• Fix #380 (install failed without git installed; #382)

Version 0.26 (31 August 2020)

• This is the final version which works on Python 2.7 (#364)
• Fix #333 (header lines not parsed when colon is in description; #335)
• Fix #359 (sections not found when leading whitespace in line; #360, #361)
• Fix #350 (bug with NULL; #352)
• Fix #339 (0.1IN not recognised as index unit; #340, #349)
• Fix #31 (add command-line script to convert between LAS versions; #329)
• Fix #75 (add Cyrillic variant for metres; #330)
• Fix #326 (Support header-only LAS files--don't lose the last header section before a missing ~A section)
• Improve documentation regarding deleting items and curves (#315, #325)
• Add deprecation markers (#331)
• Align json.dumps and LASFile.to_json() (#328)
• Fixes and updates to setup.py relating to the adoption of setuptools_scm (#312, #317, #318)
• Clean up and background changes related to future LAS 3.0 support: #334, #337, #338, #341, #342, #346, #348, #372

Version 0.25.1 (1 May 2020)

• Shift to setuptools_scm (#311)
• Fix #321 (EOF character causes error on read)
• Fix #182 (remove side-effect LASFile.write causing LASFile.version.VERS to change)
• Fix #310 (remove LASFile.metadata which was not working)

Version 0.25.0

• Add stack_curves() method to allow joining a set of curves into a 2D array (issue #284, PR #293)
• Add lasio.examples module (#296)
• Fix #278 (leading zeroes were being stripped from API/UWI numbers)
• Fix #286 (error on trying to write a file with one row of data)
• Fix #258 (do not catch Ctrl+C when reading file)
• Fix #292 (improve error checking for when trying to write non-2D data)
• Fix #277 (allow pathlib objects to lasio.read)
• Fix #264 (allow periods in mnemonics to be retained in specific cases)
• Fix #201 (adjust descr parsing in ~P section to allow times in the descr, see PR #298)
• Fix #302 (change in str(datetime) handling)
• Fixes to JSON output (#300, #303)
• Fix #304 (add column_fmt argument to LASFile.write method)

Version 0.24.1

• Fix #256 (parse units in brackets and add index_unit kwarg)

Version 0.23

• Fix #259 (error when encoding missing from URL response headers)
• Fix #262 (broken build due to cchardet dependency)