Add Python 3.8 and Black.

.travis.yml

@@ -1,19 +1,21 @@
 sudo: false
 language: python
-dist: xenial
 python:
   - "2.7"
   - "3.5"
   - "3.6"
   - "3.7"
+  - "3.8"
 
 install:
   - pip install pipenv
-  - pipenv install --dev
+  - pipenv install --dev --skip-lock
 
 script:
   - pipenv run python -m pytest --cov-report term-missing --cov=pytac
   - pipenv run flake8
+  # Run black if it has been installed (Python 3.6 and up).
+  - if pipenv run which black > /dev/null 2>&1 ; then pipenv run black --check pytac test; fi
 
 after_success:
   - coveralls

Pipfile

@@ -14,6 +14,7 @@ sphinx = "*"
 sphinx-rtd-theme = "*"
 pytest-lazy-fixture = "*"
 testfixtures = "*"
+black = {version = "==19.10b0", markers = "python_version>='3.6'" }
 
 [packages]
 numpy = "*"

README.rst

@@ -8,6 +8,8 @@
    :target: https://badge.fury.io/py/pytac
 .. image:: https://img.shields.io/pypi/pyversions/pytac.svg
    :target: https://badge.fury.io/py/pytac
+.. image:: https://img.shields.io/badge/code%20style-black-000000.svg
+    :target: https://github.com/ambv/black
 
 
 Python Toolkit for Accelerator Controls (Pytac) is a Python library for working

pytac/__init__.py

@@ -1,21 +1,38 @@
 """Pytac: Python Toolkit for Accelerator Controls."""
 # PV types.
-SP = 'setpoint'
-RB = 'readback'
+SP = "setpoint"
+RB = "readback"
 # Unit systems.
-ENG = 'engineering'
-PHYS = 'physics'
+ENG = "engineering"
+PHYS = "physics"
 # Data Source types.
-SIM = 'simulation'
-LIVE = 'live'
+SIM = "simulation"
+LIVE = "live"
 # Default argument flag.
-DEFAULT = 'default'
+DEFAULT = "default"
 
 
-from . import (data_source, device, element, exceptions, lattice, load_csv,
-               units, utils)  # noqa: E402
+from . import (  # noqa: 402
+    data_source,
+    device,
+    element,
+    exceptions,
+    lattice,
+    load_csv,
+    units,
+    utils,
+)
+
 """Error 402 is suppressed as we cannot import these modules at the top of the
 file as the strings above must be set first or the imports will fail.
 """
-__all__ = ["data_source", "device", "element", "exceptions", "lattice",
-           "load_csv", "units", "utils"]
+__all__ = [
+    "data_source",
+    "device",
+    "element",
+    "exceptions",
+    "lattice",
+    "load_csv",
+    "units",
+    "utils",
+]

pytac/cothread_cs.py

@@ -14,6 +14,7 @@ class CothreadControlSystem(ControlSystem):
 
     **Methods:**
     """
+
     def __init__(self, timeout=1.0):
         self._timeout = timeout
 
@@ -35,7 +36,7 @@ def get_single(self, pv, throw=True):
         try:
             return caget(pv, timeout=self._timeout, throw=True)
         except ca_nothing:
-            error_msg = 'Cannot connect to {}.'.format(pv)
+            error_msg = "Cannot connect to {}.".format(pv)
             if throw:
                 raise ControlSystemException(error_msg)
             else:
@@ -62,15 +63,15 @@ def get_multiple(self, pvs, throw=True):
         failures = []
         for result in results:
             if isinstance(result, ca_nothing):
-                logging.warning('Cannot connect to {}.'.format(result.name))
+                logging.warning("Cannot connect to {}.".format(result.name))
                 if throw:
                     failures.append(result)
                 else:
                     return_values.append(None)
             else:
                 return_values.append(result)
         if throw and failures:
-            error_msg = '{} caget calls failed.'.format(len(failures))
+            error_msg = "{} caget calls failed.".format(len(failures))
             raise ControlSystemException(error_msg)
         return return_values
 
@@ -93,7 +94,7 @@ def set_single(self, pv, value, throw=True):
             caput(pv, value, timeout=self._timeout, throw=True)
             return True
         except ca_nothing:
-            error_msg = 'Cannot connect to {}.'.format(pv)
+            error_msg = "Cannot connect to {}.".format(pv)
             if throw:
                 raise ControlSystemException(error_msg)
             else:
@@ -128,12 +129,12 @@ def set_multiple(self, pvs, values, throw=True):
             if not stat.ok:
                 return_values.append(False)
                 failures.append(stat)
-                logging.warning('Cannot connect to {}.'.format(stat.name))
+                logging.warning("Cannot connect to {}.".format(stat.name))
             else:
                 return_values.append(True)
         if failures:
             if throw:
-                error_msg = '{} caput calls failed.'.format(len(failures))
+                error_msg = "{} caput calls failed.".format(len(failures))
                 raise ControlSystemException(error_msg)
             else:
                 return return_values

pytac/cs.py

@@ -9,6 +9,7 @@ class ControlSystem(object):
 
     **Methods:**
     """
+
     def get_single(self, pv, throw):
         """Get the value of a given PV.
 

pytac/data_source.py

@@ -1,7 +1,6 @@
 """Module containing pytac data source classes."""
 import pytac
-from pytac.exceptions import (DataSourceException, FieldException,
-                              HandleException)
+from pytac.exceptions import DataSourceException, FieldException, HandleException
 
 
 class DataSource(object):
@@ -17,6 +16,7 @@ class DataSource(object):
 
     **Methods:**
     """
+
     def get_fields(self):
         """Get all the fields represented by this data source.
 
@@ -75,6 +75,7 @@ class DataSourceManager(object):
 
     **Methods:**
     """
+
     def __init__(self):
         self._data_sources = {}
         self._uc = {}
@@ -125,8 +126,9 @@ def add_device(self, field, device, uc):
             self._data_sources[pytac.LIVE].add_device(field, device)
             self._uc[field] = uc
         except KeyError:
-            raise DataSourceException("No device data source on manager {0}."
-                                      .format(self))
+            raise DataSourceException(
+                "No device data source on manager {0}.".format(self)
+            )
 
     def get_device(self, field):
         """Get the device for the given field.
@@ -147,8 +149,9 @@ def get_device(self, field):
         try:
             return self._data_sources[pytac.LIVE].get_device(field)
         except KeyError:
-            raise DataSourceException("No device data source on manager {0}."
-                                      .format(self))
+            raise DataSourceException(
+                "No device data source on manager {0}.".format(self)
+            )
 
     def get_unitconv(self, field):
         """Get the unit conversion option for the specified field.
@@ -165,8 +168,10 @@ def get_unitconv(self, field):
         try:
             return self._uc[field]
         except KeyError:
-            raise FieldException("No unit conversion option for field {0} on "
-                                 "manager {1}.".format(field, self))
+            raise FieldException(
+                "No unit conversion option for field {0} on "
+                "manager {1}.".format(field, self)
+            )
 
     def set_unitconv(self, field, uc):
         """set the unit conversion option for the specified field.
@@ -177,8 +182,14 @@ def set_unitconv(self, field, uc):
         """
         self._uc[field] = uc
 
-    def get_value(self, field, handle=pytac.RB, units=pytac.DEFAULT,
-                  data_source=pytac.DEFAULT, throw=True):
+    def get_value(
+        self,
+        field,
+        handle=pytac.RB,
+        units=pytac.DEFAULT,
+        data_source=pytac.DEFAULT,
+        throw=True,
+    ):
         """Get the value for a field.
 
         Returns the value of a field on the manager. This value is uniquely
@@ -209,17 +220,25 @@ def get_value(self, field, handle=pytac.RB, units=pytac.DEFAULT,
         try:
             data_source = self._data_sources[data_source]
             value = data_source.get_value(field, handle, throw)
-            return self._uc[field].convert(value, origin=data_source.units,
-                                           target=units)
+            return self._uc[field].convert(
+                value, origin=data_source.units, target=units
+            )
         except KeyError:
-            raise DataSourceException("No data source type {0} on manager {1}."
-                                      .format(data_source, self))
+            raise DataSourceException(
+                "No data source type {0} on manager {1}.".format(data_source, self)
+            )
         except FieldException:
-            raise FieldException("No field {0} on manager {1}.".format(field,
-                                                                       self))
-
-    def set_value(self, field, value, handle=pytac.SP, units=pytac.DEFAULT,
-                  data_source=pytac.DEFAULT, throw=True):
+            raise FieldException("No field {0} on manager {1}.".format(field, self))
+
+    def set_value(
+        self,
+        field,
+        value,
+        handle=pytac.SP,
+        units=pytac.DEFAULT,
+        data_source=pytac.DEFAULT,
+        throw=True,
+    ):
         """Set the value for a field.
 
         This sets a value on the machine or the simulation. If handle,units or
@@ -248,18 +267,18 @@ def set_value(self, field, value, handle=pytac.SP, units=pytac.DEFAULT,
         try:
             data_source = self._data_sources[data_source]
         except KeyError:
-            raise DataSourceException("No data source type {0} on manager {1}."
-                                      .format(data_source, self))
+            raise DataSourceException(
+                "No data source type {0} on manager {1}.".format(data_source, self)
+            )
         try:
-            value = self._uc[field].convert(value, origin=units,
-                                            target=data_source.units)
+            value = self._uc[field].convert(
+                value, origin=units, target=data_source.units
+            )
             data_source.set_value(field, value, throw)
         except KeyError:
-            raise FieldException("No field {0} on manager {1}.".format(field,
-                                                                       self))
+            raise FieldException("No field {0} on manager {1}.".format(field, self))
         except FieldException:
-            raise FieldException("No field {0} on manager {1}.".format(field,
-                                                                       self))
+            raise FieldException("No field {0} on manager {1}.".format(field, self))
 
 
 class DeviceDataSource(DataSource):
@@ -275,6 +294,7 @@ class DeviceDataSource(DataSource):
 
     **Methods:**
     """
+
     def __init__(self):
         self._devices = {}
         self.units = pytac.ENG
@@ -303,8 +323,7 @@ def get_device(self, field):
         try:
             return self._devices[field]
         except KeyError:
-            raise FieldException("No field {0} on data source {1}."
-                                 .format(field, self))
+            raise FieldException("No field {0} on data source {1}.".format(field, self))
 
     def get_fields(self):
         """Get all the fields from the data_source.
@@ -333,8 +352,7 @@ def get_value(self, field, handle, throw=True):
         try:
             return self._devices[field].get_value(handle, throw)
         except KeyError:
-            raise FieldException("No field {0} on data source {1}."
-                                 .format(field, self))
+            raise FieldException("No field {0} on data source {1}.".format(field, self))
 
     def set_value(self, field, value, throw=True):
         """Set the value of a readback or setpoint PV for a field from the
@@ -352,5 +370,4 @@ def set_value(self, field, value, throw=True):
         try:
             self._devices[field].set_value(value, throw)
         except KeyError:
-            raise FieldException("No field {0} on data source {1}."
-                                 .format(field, self))
+            raise FieldException("No field {0} on data source {1}.".format(field, self))