Blacken stragglers

Makefile

@@ -46,15 +46,15 @@ env:
 # Ignoring generated ones with .py extension.
 lint:
 	pylint -rn qiskit test
-	tools/verify_headers.py qiskit test tools
+	tools/verify_headers.py qiskit test tools examples
 	pylint -rn --disable='C0103, C0114, W0621' examples/python/*.py
-	python tools/find_optional_imports.py
+	tools/find_optional_imports.py
 
 style:
-	black --check qiskit test tools
+	black --check qiskit test tools examples setup.py
 
 black:
-	black qiskit test tools
+	black qiskit test tools examples setup.py
 
 # Use the -s (starting directory) flag for "unittest discover" is necessary,
 # otherwise the QuantumCircuit header will be modified during the discovery.

docs/conf.py

@@ -32,19 +32,20 @@
 """
 
 import os
+
 # Set env flag so that we can doc functions that may otherwise not be loaded
 # see for example interactive visualizations in qiskit.visualization.
-os.environ['QISKIT_DOCS'] = 'TRUE'
+os.environ["QISKIT_DOCS"] = "TRUE"
 
 # -- Project information -----------------------------------------------------
-project = 'Qiskit'
-copyright = '2019, Qiskit Development Team'  # pylint: disable=redefined-builtin
-author = 'Qiskit Development Team'
+project = "Qiskit"
+copyright = "2019, Qiskit Development Team"  # pylint: disable=redefined-builtin
+author = "Qiskit Development Team"
 
 # The short X.Y version
-version = ''
+version = ""
 # The full version, including alpha/beta/rc tags
-release = '0.18.0'
+release = "0.18.0"
 
 # -- General configuration ---------------------------------------------------
 
@@ -56,19 +57,19 @@
 # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
 # ones.
 extensions = [
-    'sphinx.ext.napoleon',
-    'sphinx.ext.autodoc',
-    'sphinx.ext.autosummary',
-    'sphinx.ext.mathjax',
-    'sphinx.ext.viewcode',
-    'sphinx.ext.extlinks',
-    'jupyter_sphinx',
-    'sphinx_autodoc_typehints',
-    'reno.sphinxext',
-    'sphinx_panels',
+    "sphinx.ext.napoleon",
+    "sphinx.ext.autodoc",
+    "sphinx.ext.autosummary",
+    "sphinx.ext.mathjax",
+    "sphinx.ext.viewcode",
+    "sphinx.ext.extlinks",
+    "jupyter_sphinx",
+    "sphinx_autodoc_typehints",
+    "reno.sphinxext",
+    "sphinx_panels",
 ]
-html_static_path = ['_static']
-templates_path = ['_templates']
+html_static_path = ["_static"]
+templates_path = ["_templates"]
 html_css_files = []
 
 # -----------------------------------------------------------------------------
@@ -83,7 +84,7 @@
 # -----------------------------------------------------------------------------
 
 autodoc_default_options = {
-    'inherited-members': None,
+    "inherited-members": None,
 }
 
 
@@ -94,9 +95,7 @@
 # A dictionary mapping 'figure', 'table', 'code-block' and 'section' to
 # strings that are used for format of figure numbers. As a special character,
 # %s will be replaced to figure number.
-numfig_format = {
-    'table': 'Table %s'
-}
+numfig_format = {"table": "Table %s"}
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
 #
@@ -107,10 +106,10 @@
 # List of patterns, relative to source directory, that match files and
 # directories to ignore when looking for source files.
 # This pattern also affects html_static_path and html_extra_path.
-exclude_patterns = ['_build', '**.ipynb_checkpoints']
+exclude_patterns = ["_build", "**.ipynb_checkpoints"]
 
 # The name of the Pygments (syntax highlighting) style to use.
-pygments_style = 'colorful'
+pygments_style = "colorful"
 
 # A boolean that decides whether module names are prepended to all object names
 # (for object types where a “module” of some kind is defined), e.g. for
@@ -121,7 +120,7 @@
 # (e.g., if this is set to ['foo.'], then foo.bar is shown under B, not F).
 # This can be handy if you document a project that consists of a single
 # package. Works only for the HTML builder currently.
-modindex_common_prefix = ['qiskit.']
+modindex_common_prefix = ["qiskit."]
 
 # -- Configuration for extlinks extension ------------------------------------
 # Refer to https://www.sphinx-doc.org/en/master/usage/extensions/extlinks.html
@@ -132,16 +131,16 @@
 # The theme to use for HTML and HTML Help pages.  See the documentation for
 # a list of builtin themes.
 #
-html_theme = 'qiskit_sphinx_theme'  # use the theme in subdir 'theme'
+html_theme = "qiskit_sphinx_theme"  # use the theme in subdir 'theme'
 
-#html_sidebars = {'**': ['globaltoc.html']}
-html_last_updated_fmt = '%Y/%m/%d'
+# html_sidebars = {'**': ['globaltoc.html']}
+html_last_updated_fmt = "%Y/%m/%d"
 
 html_theme_options = {
-    'logo_only': True,
-    'display_version': True,
-    'prev_next_buttons_location': 'bottom',
-    'style_external_links': True,
+    "logo_only": True,
+    "display_version": True,
+    "prev_next_buttons_location": "bottom",
+    "style_external_links": True,
 }
 
-autoclass_content = 'both'
+autoclass_content = "both"

examples/python/circuit_draw.py

@@ -25,6 +25,7 @@ def build_bell_circuit():
     qc.measure([0, 1], [0, 1])
     return qc
 
+
 # Create the circuit
 bell_circuit = build_bell_circuit()
 

examples/python/ghz.py

@@ -22,20 +22,20 @@
 # Make a quantum circuit for the GHZ state.
 ###############################################################
 num_qubits = 5
-qc = QuantumCircuit(num_qubits, num_qubits, name='ghz')
+qc = QuantumCircuit(num_qubits, num_qubits, name="ghz")
 
 # Create a GHZ state
 qc.h(0)
-for i in range(num_qubits-1):
-    qc.cx(i, i+1)
+for i in range(num_qubits - 1):
+    qc.cx(i, i + 1)
 # Insert a barrier before measurement
 qc.barrier()
 # Measure all of the qubits in the standard basis
 for i in range(num_qubits):
     qc.measure(i, i)
 
-sim_backend = BasicAer.get_backend('qasm_simulator')
+sim_backend = BasicAer.get_backend("qasm_simulator")
 job = execute(qc, sim_backend, shots=1024)
 result = job.result()
-print('Qasm simulator : ')
+print("Qasm simulator : ")
 print(result.get_counts(qc))

examples/python/ibmq/ghz.py

@@ -22,12 +22,12 @@
 # Make a quantum circuit for the GHZ state.
 ###############################################################
 num_qubits = 5
-qc = QuantumCircuit(num_qubits, num_qubits, name='ghz')
+qc = QuantumCircuit(num_qubits, num_qubits, name="ghz")
 
 # Create a GHZ state
 qc.h(0)
-for i in range(num_qubits-1):
-    qc.cx(i, i+1)
+for i in range(num_qubits - 1):
+    qc.cx(i, i + 1)
 # Insert a barrier before measurement
 qc.barrier()
 # Measure all of the qubits in the standard basis
@@ -41,10 +41,10 @@
 
 # Second version: real device
 least_busy_device = least_busy(
-    provider.backends(simulator=False,
-                      filters=lambda x: x.configuration().n_qubits > 4))
+    provider.backends(simulator=False, filters=lambda x: x.configuration().n_qubits > 4)
+)
 print("Running on current least busy device: ", least_busy_device)
 job = execute(qc, least_busy_device, shots=1024)
 result = job.result()
-print('Physical device (%s) : ' % least_busy_device)
+print("Physical device (%s) : " % least_busy_device)
 print(result.get_counts(qc))

examples/python/ibmq/hello_quantum.py

@@ -30,7 +30,7 @@
 
 # See a list of available local simulators
 print("BasicAer backends: ", BasicAer.backends())
-backend_sim = BasicAer.get_backend('qasm_simulator')
+backend_sim = BasicAer.get_backend("qasm_simulator")
 
 # Compile and run the Quantum circuit on a simulator backend
 job_sim = execute(qc, backend_sim)
@@ -43,9 +43,11 @@
 try:
     provider = IBMQ.load_account()
 except:
-    print("""WARNING: No valid IBMQ credentials found on disk.
+    print(
+        """WARNING: No valid IBMQ credentials found on disk.
              You must store your credentials using IBMQ.save_account(token, url).
-             For now, there's only access to local simulator backends...""")
+             For now, there's only access to local simulator backends..."""
+    )
     exit(0)
 
 # see a list of available remote backends
@@ -55,16 +57,17 @@
 # Compile and run the Quantum Program on a real device backend
 # select those with at least 2 qubits
 try:
-    least_busy_device = least_busy(provider.backends(
-        filters=lambda x: x.configuration().n_qubits >= 2, simulator=False))
+    least_busy_device = least_busy(
+        provider.backends(filters=lambda x: x.configuration().n_qubits >= 2, simulator=False)
+    )
 except:
     print("All devices are currently unavailable.")
 
 print("Running on current least busy device: ", least_busy_device)
 
-#running the job
+# running the job
 job_exp = execute(qc, least_busy_device, shots=1024, max_credits=10)
 result_exp = job_exp.result()
 
 # Show the results
-print('Counts: ', result_exp.get_counts(qc))
+print("Counts: ", result_exp.get_counts(qc))

examples/python/ibmq/qft.py

@@ -27,14 +27,14 @@ def input_state(circ, n):
     """n-qubit input state for QFT that produces output 1."""
     for j in range(n):
         circ.h(j)
-        circ.p(-math.pi/float(2**(j)), j)
+        circ.p(-math.pi / float(2 ** (j)), j)
 
 
 def qft(circ, n):
     """n-qubit QFT on q in circ."""
     for j in range(n):
         for k in range(j):
-            circ.cp(math.pi/float(2**(j-k)), j, k)
+            circ.cp(math.pi / float(2 ** (j - k)), j, k)
         circ.h(j)
 
 
@@ -74,8 +74,8 @@ def qft(circ, n):
 
 # Second version: real device
 least_busy_device = least_busy(
-    provider.backends(simulator=False,
-                      filters=lambda x: x.configuration().n_qubits > 4))
+    provider.backends(simulator=False, filters=lambda x: x.configuration().n_qubits > 4)
+)
 print("Running on current least busy device: ", least_busy_device)
 job = execute([qft3, qft4, qft5], least_busy_device, shots=1024)
 result = job.result()

examples/python/ibmq/using_qiskit_terra_level_0.py

@@ -37,19 +37,19 @@
 qc1 = QuantumCircuit(2, 2)
 qc1.h(0)
 qc1.cx(0, 1)
-qc1.measure([0,1], [0,1])
+qc1.measure([0, 1], [0, 1])
 
 # making another circuit: superpositions
 qc2 = QuantumCircuit(2, 2)
-qc2.h([0,1])
-qc2.measure([0,1], [0,1])
+qc2.h([0, 1])
+qc2.measure([0, 1], [0, 1])
 
 # setting up the backend
 print("(BasicAER Backends)")
 print(BasicAer.backends())
 
 # running the job
-job_sim = execute([qc1, qc2], BasicAer.get_backend('qasm_simulator'))
+job_sim = execute([qc1, qc2], BasicAer.get_backend("qasm_simulator"))
 sim_result = job_sim.result()
 
 # Show the results

examples/python/ibmq/using_qiskit_terra_level_1.py

@@ -40,18 +40,18 @@
 qc1 = QuantumCircuit(2, 2, name="bell")
 qc1.h(0)
 qc1.cx(0, 1)
-qc1.measure([0,1], [0,1])
+qc1.measure([0, 1], [0, 1])
 
 # Making another circuit: superpositions
 qc2 = QuantumCircuit(2, 2, name="superposition")
-qc2.h([0,1])
-qc2.measure([0,1], [0,1])
+qc2.h([0, 1])
+qc2.measure([0, 1], [0, 1])
 
 # Setting up the backend
 print("(Aer Backends)")
 for backend in BasicAer.backends():
     print(backend.status())
-qasm_simulator = BasicAer.get_backend('qasm_simulator')
+qasm_simulator = BasicAer.get_backend("qasm_simulator")
 
 
 # Compile and run the circuit on a real device backend
@@ -87,7 +87,7 @@
 sim_job = qasm_simulator.run(qobj)
 
 # Getting the result
-sim_result=sim_job.result()
+sim_result = sim_job.result()
 
 # Show the results
 print(sim_result.get_counts(qc1))

examples/python/ibmq/using_qiskit_terra_level_2.py

@@ -56,7 +56,7 @@
 print("(Aer Backends)")
 for backend in BasicAer.backends():
     print(backend.status())
-qasm_simulator = BasicAer.get_backend('qasm_simulator')
+qasm_simulator = BasicAer.get_backend("qasm_simulator")
 
 
 # Compile and run the circuit on a real device backend
@@ -97,7 +97,7 @@
 pm.append(CXDirection(coupling_map))
 
 # unroll to single qubit gates
-pm.append(Unroller(['u1', 'u2', 'u3', 'id', 'cx']))
+pm.append(Unroller(["u1", "u2", "u3", "id", "cx"]))
 qc1_new = pm.run(qc1)
 qc2_new = pm.run(qc2)
 

examples/python/initialize.py

@@ -39,7 +39,8 @@
     0,
     0,
     1 / math.sqrt(4) * complex(1, 0),
-    1 / math.sqrt(8) * complex(1, 0)]
+    1 / math.sqrt(8) * complex(1, 0),
+]
 
 circuit.initialize(desired_vector, [0, 1, 2, 3])
 
@@ -54,17 +55,15 @@
 
 # Desired vector
 print("Desired probabilities: ")
-print(str(list(map(lambda x: format(abs(x * x), '.3f'), desired_vector))))
+print(str(list(map(lambda x: format(abs(x * x), ".3f"), desired_vector))))
 
 # Initialize on local simulator
-sim_backend = BasicAer.get_backend('qasm_simulator')
+sim_backend = BasicAer.get_backend("qasm_simulator")
 job = execute(circuit, sim_backend, shots=shots)
 result = job.result()
 
 counts = result.get_counts(circuit)
 
-qubit_strings = [format(i, '0%sb' % 4) for
-                 i in range(2 ** 4)]
+qubit_strings = [format(i, "0%sb" % 4) for i in range(2 ** 4)]
 print("Probabilities from simulator: ")
-print([format(counts.get(s, 0) / shots, '.3f') for
-       s in qubit_strings])
+print([format(counts.get(s, 0) / shots, ".3f") for s in qubit_strings])

examples/python/load_qasm.py

@@ -19,7 +19,7 @@
 print(circ)
 
 # See the backend
-sim_backend = BasicAer.get_backend('qasm_simulator')
+sim_backend = BasicAer.get_backend("qasm_simulator")
 
 
 # Compile and run the Quantum circuit on a local simulator backend