Flake8 maintenance: Lasio: part 1

[dcslagel]

Description:

This change covers flake8 changes for the first of the Lasio files.
This is part of Flake8 maintenance for Lasio code #564

• lasio/examples.py
• lasio/excel.py

This pull request makes changes suggested by flake8.

encoding.py

examples.py:81:30: F821 undefined name 'encoding_kwargs'
examples.py:82:28: F821 undefined name 'encoding_kwargs'

excel.py

excel.py:106:5: E741 ambiguous variable name 'l'
excel.py:135:17: E741 ambiguous variable name 'l'
excel.py:138:13: E722 do not use bare 'except'

Test Results

Name                       Stmts   Miss  Cover
----------------------------------------------
lasio/__init__.py             28      6    79%
lasio/convert_version.py      20     20     0%
lasio/defaults.py             12      0   100%
lasio/examples.py             42     10    76%
lasio/excel.py                88     34    61%
lasio/exceptions.py            6      0   100%
lasio/las.py                 495     63    87%
lasio/las_items.py           220     30    86%
lasio/las_version.py          69     23    67%
lasio/reader.py              470     19    96%
lasio/writer.py              200      9    96%
----------------------------------------------
TOTAL                       1650    214    87%
Coverage XML written to file coverage.xml



--------------------------------------------------- benchmark: 1 tests --------------------------------------------------
Name (time in ms)                 Min       Max      Mean  StdDev    Median     IQR  Outliers     OPS  Rounds  Iterations
-------------------------------------------------------------------------------------------------------------------------
test_read_v12_sample_big     125.2639  126.7751  125.8339  0.4944  125.7579  0.6141       3;0  7.9470       8           1
-------------------------------------------------------------------------------------------------------------------------

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Let me know if this change could be accepted (or rejected) or
needs some additional changes to be approved and merged.

Thank you,
DC