Merge pull request #94 from tommilligan/py38

Update examples and tests for Python 3.8 compatibility

Author: madzak

.travis.yml

@@ -5,5 +5,6 @@ python:
   - "3.5"
   - "3.6"
   - "3.7"
+  - "3.8"
 install: pip install tox-travis
 script: tox

README.md

@@ -60,7 +60,7 @@ formatter = CustomJsonFormatter('one;two')
 
 # is equivalent to:
 
-formatter = jsonlogger.JsonFormatter('(one) (two)')
+formatter = jsonlogger.JsonFormatter('%(one)s %(two)s')
 ```
 
 You can also add extra fields to your json output by specifying a dict in place of message, as well as by specifying an `extra={}` argument.
@@ -82,7 +82,7 @@ class CustomJsonFormatter(jsonlogger.JsonFormatter):
         else:
             log_record['level'] = record.levelname
 
-formatter = CustomJsonFormatter('(timestamp) (level) (name) (message)')
+formatter = CustomJsonFormatter('%(timestamp)s %(level)s %(name)s %(message)s')
 ```
 
 Items added to the log record will be included in *every* log message, no matter what the format requires.

setup.py

@@ -25,6 +25,7 @@
         'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
+        'Programming Language :: Python :: 3.8',
         'Topic :: System :: Logging',
     ]
 )

tests/tests.py

@@ -63,7 +63,7 @@ def testFormatKeys(self):
             'threadName'
         ]
 
-        log_format = lambda x: ['%({0:s})'.format(i) for i in x]
+        log_format = lambda x: ['%({0:s})s'.format(i) for i in x]
         custom_format = ' '.join(log_format(supported_keys))
 
         fr = jsonlogger.JsonFormatter(custom_format)

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py34, py35, py36, py37
+envlist = py34, py35, py36, py37, py38
 
 [testenv]
 commands = python -m unittest discover