Drop hard dependency on smart_open (#81)

docs/quick-start.rst

@@ -1,8 +1,8 @@
 Quick Start
 ===========
 
-To demonstrate the features of this library we will use a test file
-available at this remote location:
+To demonstrate the features of this library we will use a test file at an HTTPS endpoint.
+To follow along, ensure you have the `smart_open` library installed!
 
 .. code-block:: python
 

docs/sample_sheet.rst

@@ -16,4 +16,3 @@ API Reference
     :members:
     :undoc-members:
     :show-inheritance:
-

pyproject.toml

@@ -1,6 +1,5 @@
 [tool.black]
 line-length = 79
-py36 = true
 skip-string-normalization = true
 include = '\.pyi?$'
 exclude = '''

sample_sheet/__init__.py

@@ -1,4 +1,5 @@
 import csv
+import importlib
 import json
 import os
 import re
@@ -23,7 +24,11 @@
 )
 
 from requests.structures import CaseInsensitiveDict
-from smart_open import smart_open  # type: ignore
+
+try:
+    from smart_open import smart_open as open  # type: ignore
+except ImportError:
+    pass
 from tabulate import tabulate  # type: ignore
 from terminaltables import SingleTable
 
@@ -384,7 +389,7 @@ class SampleSheet(object):
 
     Args:
         path:  Any path supported by :class:`pathlib.Path` and/or
-            :class:`smart_open.smart_open`.
+            :class:`smart_open.smart_open` when `smart_open` is installed.
 
     """
 
@@ -471,7 +476,7 @@ def _parse(self, path: Union[Path, str]) -> None:
         section_name: str = ''
         sample_header: Optional[List[str]] = None
 
-        with smart_open(path, encoding=self._encoding) as handle:
+        with open(path, encoding=self._encoding) as handle:
             lines = list(csv.reader(handle, skipinitialspace=True))
 
         for i, line in enumerate(lines):

sample_sheet/_version.py

@@ -0,0 +1 @@
+__version__ = '0.9.0'

setup.py

@@ -1,28 +1,36 @@
 import setuptools
+import sys
 
 from pathlib import Path
-from setuptools import find_packages
+
+PACKAGE: str = 'sample_sheet'
+
+if sys.version_info < (3, 6):
+    sys.exit(f'Python < 3.6 will not be supported.')
+
+
+def this_version() -> str:
+    """Read the variable `__version__` from the module itself."""
+    contents = Path('sample_sheet/_version.py').read_text()
+    *_, version = contents.strip().split()
+    return version
+
 
 setuptools.setup(
     name='sample-sheet',
-    version='0.8.0',
+    version=this_version(),
     author='clintval',
     author_email='valentine.clint@gmail.com',
     description='An Illumina Sample Sheet parsing library',
     url='https://github.com/clintval/sample-sheet',
-    download_url='https://github.com/sample-sheet/archive/v0.8.0.tar.gz',
+    download_url=f'https://github.com/sample-sheet/archive/v{this_version()}.tar.gz',
     long_description=Path('README.md').read_text(),
     long_description_content_type='text/markdown',
     license='MIT',
     zip_safe=True,
-    packages=find_packages(),
-    install_requires=[
-        'click',
-        'requests',
-        'smart_open>=1.5.4',
-        'tabulate',
-        'terminaltables',
-    ],
+    packages=setuptools.find_packages(where='./'),
+    install_requires=['click', 'requests', 'tabulate', 'terminaltables'],
+    extras_require={'smart_open': ['smart_open>=1.5.4']},
     scripts=['scripts/sample-sheet'],
     keywords='illumina samplesheet sample sheet parser bioinformatics',
     classifiers=[

tox.ini

@@ -8,6 +8,7 @@ envlist =
     py36-docs
 
 [testenv]
+extras = smart_open
 description = run the test suite with (basepython)
 deps = -rtest-requirements.txt
 commands = pytest {posargs}