Remove references to building TFDV on Python 2.

PiperOrigin-RevId: 315990465

Author: caveness

README.md

@@ -64,14 +64,6 @@ Note that these instructions will install the latest master branch of TensorFlow
 Data Validation. If you want to install a specific branch (such as a release
 branch), pass `-b <branchname>` to the `git clone` command.
 
-When building on Python 2, make sure to strip the Python types in the source
-code using the following commands:
-
-```shell
-pip install strip-hints
-python tensorflow_data_validation/tools/strip_type_hints.py tensorflow_data_validation/
-```
-
 ### 3. Build the pip package
 
 Then, run the following at the project root:
@@ -80,7 +72,7 @@ Then, run the following at the project root:
 sudo docker-compose build manylinux2010
 sudo docker-compose run -e PYTHON_VERSION=${PYTHON_VERSION} manylinux2010
 ```
-where `PYTHON_VERSION` is one of `{27, 35, 36, 37}`.
+where `PYTHON_VERSION` is one of `{35, 36, 37}`.
 
 A wheel will be produced under `dist/`.
 
@@ -117,14 +109,6 @@ Note that these instructions will install the latest master branch of TensorFlow
 Data Validation. If you want to install a specific branch (such as a release branch),
 pass `-b <branchname>` to the `git clone` command.
 
-When building on Python 2, make sure to strip the Python types in the source
-code using the following commands:
-
-```shell
-pip install strip-hints
-python tensorflow_data_validation/tools/strip_type_hints.py tensorflow_data_validation/
-```
-
 ### 3. Build the pip package
 
 TFDV uses Bazel to build the pip package from source. Before invoking the