Make s3fs / boto optional

[TomAugspurger]

Currently s3fs and boto3 are required dependencies of dask_deltatable. Can they be put in an s3 or aws optional requirements list?

This diff should do the trick

diff --git a/dask_deltatable/core.py b/dask_deltatable/core.py
index f833c16..1fa85ac 100644
--- a/dask_deltatable/core.py
+++ b/dask_deltatable/core.py
@@ -6,7 +6,6 @@ from urllib.parse import urlparse
 import dask
 import dask.dataframe as dd
 import pyarrow.parquet as pq
-from boto3 import Session
 from dask.base import tokenize
 from dask.dataframe.io import from_delayed
 from dask.delayed import delayed
@@ -172,6 +171,8 @@ class DeltaTableWrapper(object):
 def _read_from_catalog(
     database_name: str, table_name: str, **kwargs
 ) -> dd.core.DataFrame:
+    from boto3 import Session
+
     if ("AWS_ACCESS_KEY_ID" not in os.environ) and (
         "AWS_SECRET_ACCESS_KEY" not in os.environ
     ):
diff --git a/requirements.txt b/requirements.txt
index d12c835..5233228 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,4 @@
 dask[dataframe,distribuited]
-boto3
 deltalake==0.6.3
 fsspec==2022.10.0
 pyarrow==10.0.0
-s3fs==2022.10.0
diff --git a/setup.py b/setup.py
index f4428f8..3fe0698 100644
--- a/setup.py
+++ b/setup.py
@@ -5,6 +5,7 @@ from setuptools import setup
 with open("README.md", "r", encoding="utf-8") as f:
     long_description = f.read()
 
+
 setup(
     name="dask-deltatable",
     version="0.3rc",
@@ -17,7 +18,10 @@ setup(
     long_description_content_type="text/markdown",
     python_requires=">=3.7",
     install_requires=open("requirements.txt").read().strip().split("\n"),
-    extras_require={"dev": ["pytest", "requests", "pytest-cov>=2.10.1"]},
+    extras_require={
+        "dev": ["pytest", "requests", "pytest-cov>=2.10.1"],
+        "s3": ["s3fs==2022.10.0", "boto3"],
+    },
     package_data={"dask_deltatable": ["*.pyi" "__init__.pyi", "core.pyi"]},
     include_package_data=True,
     zip_safe=False,

[jrbourbeau]

Closed via #9