Removing Python 2 support (#381)

Author: hiranya911

.travis.yml

@@ -1,9 +1,9 @@
 language: python
 python:
-  - "2.7"
   - "3.4"
   - "3.5"
   - "3.6"
+  - "3.7"
   - "pypy3.5"
 
 jobs:

CONTRIBUTING.md

@@ -85,7 +85,7 @@ information on using pull requests.
 
 ### Initial Setup
 
-You need Python 2.7 or Python 3.4+ to build and test the code in this repo.
+You need Python 3.4+ to build and test the code in this repo.
 
 We recommend using [pip](https://pypi.python.org/pypi/pip) for installing the necessary tools and
 project dependencies. Most recent versions of Python ship with pip. If your development environment
@@ -227,53 +227,6 @@ pytest --cov --cov-report html
 and point your browser to
 `file:///<dir>/htmlcov/index.html` (where `dir` is the location from which the report was created).
 
-
-### Testing in Different Environments
-
-Sometimes we want to run unit tests in multiple environments (e.g. different Python versions), and
-ensure that the SDK works as expected in each of them. We use
-[tox](https://tox.readthedocs.io/en/latest/) for this purpose.
-
-But before you can invoke tox, you must set up all the necessary target environments on your
-workstation. The easiest and cleanest way to achieve this is by using a tool like
-[pyenv](https://github.com/pyenv/pyenv). Refer to the
-[pyenv documentation](https://github.com/pyenv/pyenv#installation) for instructions on how to
-install it. This generally involves installing some binaries as well as modifying a system level
-configuration file such as `.bash_profile`. Once pyenv is installed, you can install multiple
-versions of Python as follows:
-
-```
-pyenv install 2.7.6        # install Python 2.7.6
-pyenv install 3.3.0        # install Python 3.3.0
-pyenv install pypy2-5.6.0  # install pypy2
-```
-
-Refer to the [`tox.ini`](tox.ini) file for a list of target environments that we usually test.
-Use pyenv to install all the required Python versions on your workstation. Verify that they are
-installed by running the following command:
-
-```
-pyenv versions
-```
-
-To make all the required Python versions available to tox for testing, run the `pyenv local` command
-with all the Python versions as arguments. The following example shows how to make Python versions
-2.7.6, 3.3.0 and pypy2 available to tox.
-
-```
-pyenv local 2.7.6 3.3.0 pypy2-5.6.0
-```
-
-Once your system is fully set up, you can execute the following command from the root of the
-repository to launch tox:
-
-```
-tox
-```
-
-This command will read the list of target environments from `tox.ini`, and execute tests in each of
-those environments. It will also generate a code coverage report at the end of the execution.
-
 ### Repo Organization
 
 Here are some highlights of the directory structure and notable source files

README.md

@@ -41,10 +41,8 @@ requests, code review feedback, and also pull requests.
 
 ## Supported Python Versions
 
-We currently support Python 2.7 and Python 3.4+. However, Python 2.7 support is
-being phased out, and the developers are advised to use latest Python 3.
-Firebase Admin Python SDK is also tested on PyPy and
-[Google App Engine](https://cloud.google.com/appengine/) environments.
+We currently support Python 3.4+. Firebase Admin Python SDK is also tested on
+PyPy and [Google App Engine](https://cloud.google.com/appengine/) environments.
 
 
 ## Documentation

requirements.txt

@@ -2,7 +2,6 @@ pylint == 1.6.4
 pytest >= 3.6.0
 pytest-cov >= 2.4.0
 pytest-localserver >= 0.4.1
-tox >= 3.6.0
 
 cachecontrol >= 0.12.6
 google-api-core[grpc] >= 1.14.0, < 2.0.0dev; platform.python_implementation != 'PyPy'

scripts/prepare_release.sh

@@ -132,7 +132,7 @@ fi
 ##################
 
 echo "[INFO] Running unit tests"
-tox
+pytest ../tests
 
 echo "[INFO] Running integration tests"
 pytest ../integration --cert cert.json --apikey apikey.txt

setup.py

@@ -22,8 +22,8 @@
 
 
 (major, minor) = (sys.version_info.major, sys.version_info.minor)
-if (major == 2 and minor < 7) or (major == 3 and minor < 4):
-    print('firebase_admin requires python2 >= 2.7 or python3 >= 3.4', file=sys.stderr)
+if major != 3 or minor < 4:
+    print('firebase_admin requires python >= 3.4', file=sys.stderr)
     sys.exit(1)
 
 # Read in the package metadata per recommendations from:
@@ -56,13 +56,11 @@
     keywords='firebase cloud development',
     install_requires=install_requires,
     packages=['firebase_admin'],
-    python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*',
+    python_requires='>=3.4',
     classifiers=[
         'Development Status :: 5 - Production/Stable',
         'Intended Audience :: Developers',
         'Topic :: Software Development :: Build Tools',
-        'Programming Language :: Python :: 2',
-        'Programming Language :: Python :: 2.7',
         'Programming Language :: Python :: 3',
         'Programming Language :: Python :: 3.4',
         'Programming Language :: Python :: 3.5',