MAINT: Use isort and black

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,4 +1,4 @@
 - [ ] closes #xxxx
 - [ ] tests added / passed
-- [ ] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
+- [ ] passes `black --check pandas_datareader`
 - [ ] added entry to docs/source/whatsnew/vLATEST.txt

.travis.yml

@@ -35,15 +35,17 @@ matrix:
 
 install:
   - source ci/pypi-install.sh;
-  - pip install codecov coveralls beautifulsoup4 flake8
   - pip list
   - python setup.py install
 
 script:
+
   - if [[ -n "${TEST_TYPE+x}" ]]; then export MARKERS="-m ${TEST_TYPE}"; fi
   - pytest -s -r xX "${MARKERS}" --cov-config .coveragerc --cov=pandas_datareader --cov-report xml:/tmp/cov-datareader.xml --junitxml=/tmp/datareader.xml
-  - flake8 --version
-  - flake8 pandas_datareader
+  - |
+    if [[ "$TRAVIS_PYTHON_VERSION" != 2.7 ]]; then
+      black --check pandas_datareader
+    fi
 
 after_script:
   - |

ci/pypi-install.sh

@@ -1,15 +1,19 @@
 #!/usr/bin/env bash
 
-echo "PyPI install"
-
 pip install pip --upgrade
-pip install numpy=="$NUMPY" pytz python-dateutil coverage setuptools html5lib lxml pytest pytest-cov wrapt
+pip install numpy=="$NUMPY" pytz python-dateutil coverage setuptools html5lib lxml pytest pytest-cov wrapt codecov coveralls beautifulsoup4 isort
+
+if [[ "$TRAVIS_PYTHON_VERSION" != 2.7 ]]; then
+  pip install black
+fi
+
 if [[ "$PANDAS" == "MASTER" ]]; then
   PRE_WHEELS="https://7933911d6844c6c53a7d-47bd50c35cd79bd838daf386af554a83.ssl.cf2.rackcdn.com"
   pip install --pre --upgrade --timeout=60 -f "$PRE_WHEELS" pandas
 else
   pip install pandas=="$PANDAS"
 fi
+
 if [[ "$DOCBUILD" ]]; then
   pip install sphinx ipython matplotlib sphinx_rtd_theme doctr
 fi

pandas_datareader/__init__.py

@@ -1,24 +1,60 @@
 from ._version import get_versions
-from .data import (DataReader, Options, get_components_yahoo,
-                   get_dailysummary_iex, get_data_enigma, get_data_famafrench,
-                   get_data_fred, get_data_moex, get_data_quandl,
-                   get_data_stooq, get_data_yahoo, get_data_yahoo_actions,
-                   get_iex_book, get_iex_symbols, get_last_iex,
-                   get_markets_iex, get_nasdaq_symbols, get_quote_yahoo,
-                   get_recent_iex, get_records_iex, get_summary_iex,
-                   get_tops_iex, get_data_tiingo, get_iex_data_tiingo,
-                   get_data_alphavantage)
+from .data import (
+    DataReader,
+    Options,
+    get_components_yahoo,
+    get_dailysummary_iex,
+    get_data_alphavantage,
+    get_data_enigma,
+    get_data_famafrench,
+    get_data_fred,
+    get_data_moex,
+    get_data_quandl,
+    get_data_stooq,
+    get_data_tiingo,
+    get_data_yahoo,
+    get_data_yahoo_actions,
+    get_iex_book,
+    get_iex_data_tiingo,
+    get_iex_symbols,
+    get_last_iex,
+    get_markets_iex,
+    get_nasdaq_symbols,
+    get_quote_yahoo,
+    get_recent_iex,
+    get_records_iex,
+    get_summary_iex,
+    get_tops_iex,
+)
 
-__version__ = get_versions()['version']
+__version__ = get_versions()["version"]
 del get_versions
 
-__all__ = ['__version__', 'get_components_yahoo', 'get_data_enigma',
-           'get_data_famafrench', 'get_data_yahoo',
-           'get_data_yahoo_actions', 'get_quote_yahoo',
-           'get_iex_book', 'get_iex_symbols', 'get_last_iex',
-           'get_markets_iex', 'get_recent_iex', 'get_records_iex',
-           'get_summary_iex', 'get_tops_iex',
-           'get_nasdaq_symbols', 'get_data_quandl', 'get_data_moex',
-           'get_data_fred', 'get_dailysummary_iex',
-           'get_data_stooq', 'DataReader', 'Options',
-           'get_data_tiingo', 'get_iex_data_tiingo', 'get_data_alphavantage']
+__all__ = [
+    "__version__",
+    "get_components_yahoo",
+    "get_data_enigma",
+    "get_data_famafrench",
+    "get_data_yahoo",
+    "get_data_yahoo_actions",
+    "get_quote_yahoo",
+    "get_iex_book",
+    "get_iex_symbols",
+    "get_last_iex",
+    "get_markets_iex",
+    "get_recent_iex",
+    "get_records_iex",
+    "get_summary_iex",
+    "get_tops_iex",
+    "get_nasdaq_symbols",
+    "get_data_quandl",
+    "get_data_moex",
+    "get_data_fred",
+    "get_dailysummary_iex",
+    "get_data_stooq",
+    "DataReader",
+    "Options",
+    "get_data_tiingo",
+    "get_iex_data_tiingo",
+    "get_data_alphavantage",
+]

pandas_datareader/_utils.py

@@ -1,7 +1,8 @@
 import datetime as dt
 
-import requests
 from pandas import to_datetime
+import requests
+
 from pandas_datareader.compat import is_number
 
 
@@ -33,7 +34,7 @@ def _sanitize_dates(start, end):
     if end is None:
         end = dt.datetime.today()
     if start > end:
-        raise ValueError('start must be an earlier date than end')
+        raise ValueError("start must be an earlier date than end")
     return start, end