Run pyupgrade on codebase

https://github.com/asottile/pyupgrade
`pyupgrade --py37-plus`

Author: vrslev

doc/fake__jack.py

@@ -15,7 +15,7 @@ def new_find_library(name):
 ctypes.util.find_library = new_find_library
 
 
-class Fake(object):
+class Fake:
 
     NULL = NotImplemented
 

examples/aliases.py

@@ -17,28 +17,28 @@
 else:
     print('JACK server was already running')
     if client.status.name_not_unique:
-        print('unique client name generated: {}'.format(client.name))
+        print(f'unique client name generated: {client.name}')
 
 ports = client.get_ports()
 
 print('Testing set_alias() ...')
 for i, port in enumerate(ports):
-    alias_name = 'Alias Name {}'.format(i)
-    print("port '{}' => set_alias('{}')".format(port.shortname,alias_name))
+    alias_name = f'Alias Name {i}'
+    print(f"port '{port.shortname}' => set_alias('{alias_name}')")
     port.set_alias(alias_name)
 
 print('Testing aliases property ...')
 for port in ports:
     for i, alias in enumerate(port.aliases):
-        print("port '{}', alias {} => '{}'".format(port.shortname,i,alias))
+        print(f"port '{port.shortname}', alias {i} => '{alias}'")
 
 print('Testing unset_alias() ...')
 for i, port in enumerate(ports):
-    alias_name = 'Alias Name {}'.format(i)
-    print("port '{}' => unset_alias('{}')".format(port.shortname,alias_name))
+    alias_name = f'Alias Name {i}'
+    print(f"port '{port.shortname}' => unset_alias('{alias_name}')")
     port.unset_alias(alias_name)
 
 print('Testing aliases property ...')
 for port in ports:
     for i, alias in enumerate(port.aliases):
-        print("port '{}', alias {} => '{}'".format(port.shortname,i,alias))
+        print(f"port '{port.shortname}', alias {i} => '{alias}'")

examples/chatty_client.py

@@ -7,7 +7,6 @@
 and prints some information whenever they are called.
 
 """
-from __future__ import print_function  # only needed for Python 2.x
 import jack
 
 print('setting error/info functions')
@@ -96,7 +95,7 @@ def xrun(delay):
 try:
     @client.set_property_change_callback
     def property_change(subject, key, changed):
-        print('subject {}: '.format(subject), end='')
+        print(f'subject {subject}: ', end='')
         if not key:
             assert changed == jack.PROPERTY_DELETED
             print('all properties were removed')

examples/midi_monitor.py

@@ -12,7 +12,7 @@
 @client.set_process_callback
 def process(frames):
     for offset, data in port.incoming_midi_events():
-        print('{0}: 0x{1}'.format(client.last_frame_time + offset,
+        print('{}: 0x{}'.format(client.last_frame_time + offset,
                                   binascii.hexlify(data).decode()))
 
 with client:

examples/play_file.py

@@ -10,8 +10,6 @@
 installed for this to work.
 
 """
-from __future__ import division
-from __future__ import print_function
 import argparse
 try:
     import queue  # Python 3.x
@@ -87,7 +85,7 @@ def process(frames):
 
     with sf.SoundFile(args.filename) as f:
         for ch in range(f.channels):
-            client.outports.register('out_{0}'.format(ch + 1))
+            client.outports.register(f'out_{ch + 1}')
         block_generator = f.blocks(blocksize=blocksize, dtype='float32',
                                    always_2d=True, fill_value=0)
         for _, data in zip(range(args.buffersize), block_generator):

examples/showtime.py

@@ -25,7 +25,7 @@ def showtime():
     items = []
     items.append('frame = {}  frame_time = {} usecs = {} '.format(
         pos['frame'], client.frame_time, pos['usecs']))
-    items.append('state: {}'.format(state))
+    items.append(f'state: {state}')
     with suppress(KeyError):
         items.append('BBT: {bar:3}|{beat}|{tick:04}'.format(**pos))
     with suppress(KeyError):
@@ -38,7 +38,7 @@ def showtime():
     with suppress(KeyError):
         video_offset = pos['video_offset']
         if video_offset:
-            items.append(' video@: ({})'.format(video_offset))
+            items.append(f' video@: ({video_offset})')
         else:
             items.append(' no video');
     print(*items, sep='\t')

examples/slow_sync.py

@@ -26,7 +26,7 @@ def slow_sync_callback(state, pos):
             slow.pos = pos.frame
             slow.ready_at = None
             return True
-        print('will be ready in {:.2f} seconds'.format(slow.ready_at - now))
+        print(f'will be ready in {slow.ready_at - now:.2f} seconds')
     elif state == jack.STARTING:
         if slow.pos == pos.frame:
             print('ready')
@@ -38,7 +38,7 @@ def slow_sync_callback(state, pos):
             slow.pos = pos.frame
             slow.ready_at = None
             return True
-        print('will be ready in {:.2f} seconds'.format(slow.ready_at - now))
+        print(f'will be ready in {slow.ready_at - now:.2f} seconds')
         return False
     elif state == jack.ROLLING:
         assert slow.pos != pos.frame
@@ -48,7 +48,7 @@ def slow_sync_callback(state, pos):
             slow.pos = pos.frame
             slow.ready_at = None
             return True
-        print('will catch up in {:.2f} seconds'.format(slow.ready_at - now))
+        print(f'will catch up in {slow.ready_at - now:.2f} seconds')
         return False
     else:
         assert False

examples/thru_client.py

@@ -10,20 +10,10 @@
 
 """
 import sys
-import signal
 import os
 import jack
 import threading
 
-if sys.version_info < (3, 0):
-    # In Python 2.x, event.wait() cannot be interrupted with Ctrl+C.
-    # Therefore, we disable the whole KeyboardInterrupt mechanism.
-    # This will not close the JACK client properly, but at least we can
-    # use Ctrl+C.
-    signal.signal(signal.SIGINT, signal.SIG_DFL)
-else:
-    # If you use Python 3.x, everything is fine.
-    pass
 
 argv = iter(sys.argv)
 # By default, use script name without extension as client name:
@@ -36,7 +26,7 @@
 if client.status.server_started:
     print('JACK server started')
 if client.status.name_not_unique:
-    print('unique name {0!r} assigned'.format(client.name))
+    print(f'unique name {client.name!r} assigned')
 
 event = threading.Event()
 
@@ -59,8 +49,8 @@ def shutdown(status, reason):
 
 # create two port pairs
 for number in 1, 2:
-    client.inports.register('input_{0}'.format(number))
-    client.outports.register('output_{0}'.format(number))
+    client.inports.register(f'input_{number}')
+    client.outports.register(f'output_{number}')
 
 with client:
     # When entering this with-statement, client.activate() is called.

examples/timebase_master.py

@@ -118,7 +118,7 @@ def main(args=None):
             ticks_per_beat=args.ticks_per_beat,
             debug=args.debug)
     except jack.JackError as exc:
-        ap.exit('Could not create timebase master JACK client: {}'.format(exc))
+        ap.exit(f'Could not create timebase master JACK client: {exc}')
 
     with tbmaster:
         if tbmaster.become_timebase_master(args.conditional):

examples/transporter.py

@@ -25,21 +25,21 @@ def main(args=None):
     try:
         client = jack.Client(args.client_name)
     except jack.JackError as exc:
-        ap.exit('Could not create JACK client: {}'.format(exc))
+        ap.exit(f'Could not create JACK client: {exc}')
 
     state = client.transport_state
     result = 0
 
     if args.command == 'status':
-        print('JACK transport state is {}.'.format(state))
+        print(f'JACK transport state is {state}.')
         result = 1 if state == jack.STOPPED else 0
     elif args.command == 'query':
-        print('State: {}'.format(state))
+        print(f'State: {state}')
         info = client.transport_query()[1]
 
         for field in sorted(info):
             label = string.capwords(field.replace('_', ' '))
-            print('{}: {}'.format(label, info[field]))
+            print(f'{label}: {info[field]}')
 
         result = 1 if state == jack.STOPPED else 0
     elif args.command == 'start':