Fixed issue 6612 by covering ibmq examples by lint check

Make.bat

@@ -42,6 +42,9 @@ GOTO :next
 
 :lint
 pylint qiskit test
+python "tools/verify_headers.py" qiskit test tools examples
+pylint -rn --disable="C0103, W0621, E0611, E0401" examples
+python "tools/find_optional_imports.py"
 IF errorlevel 9009 GOTO :error
 GOTO :next
 

Makefile

@@ -47,7 +47,7 @@ env:
 lint:
 	pylint -rn qiskit test tools
 	tools/verify_headers.py qiskit test tools examples
-	pylint -rn --disable='C0103, C0114, W0621' examples/python/*.py
+	pylint -rn --disable='C0103, W0621, E0611, E0401' examples
 	tools/find_optional_imports.py
 
 style:

examples/__init__.py

@@ -0,0 +1,13 @@
+# This code is part of Qiskit.
+#
+# (C) Copyright IBM 2017.
+#
+# This code is licensed under the Apache License, Version 2.0. You may
+# obtain a copy of this license in the LICENSE.txt file in the root directory
+# of this source tree or at http://www.apache.org/licenses/LICENSE-2.0.
+#
+# Any modifications or derivative works of this code must retain this
+# copyright notice, and modified files need to carry a notice indicating
+# that they have been altered from the originals.
+
+"""Simple examples to demonstrate the usage of Qiskit Terra."""

examples/python/__init__.py

@@ -0,0 +1,13 @@
+# This code is part of Qiskit.
+#
+# (C) Copyright IBM 2017.
+#
+# This code is licensed under the Apache License, Version 2.0. You may
+# obtain a copy of this license in the LICENSE.txt file in the root directory
+# of this source tree or at http://www.apache.org/licenses/LICENSE-2.0.
+#
+# Any modifications or derivative works of this code must retain this
+# copyright notice, and modified files need to carry a notice indicating
+# that they have been altered from the originals.
+
+"""Simple examples to demonstrate the usage of Qiskit Terra."""

examples/python/commutation_relation.py

@@ -10,6 +10,11 @@
 # copyright notice, and modified files need to carry a notice indicating
 # that they have been altered from the originals.
 
+"""
+Example showing how to cancel redundant gates in a quantum circuit using
+Qiskit.
+"""
+
 from qiskit import QuantumCircuit
 
 from qiskit.transpiler import PassManager

examples/python/ibmq/__init__.py

@@ -0,0 +1,14 @@
+# This code is part of Qiskit.
+#
+# (C) Copyright IBM 2017.
+#
+# This code is licensed under the Apache License, Version 2.0. You may
+# obtain a copy of this license in the LICENSE.txt file in the root directory
+# of this source tree or at http://www.apache.org/licenses/LICENSE-2.0.
+#
+# Any modifications or derivative works of this code must retain this
+# copyright notice, and modified files need to carry a notice indicating
+# that they have been altered from the originals.
+
+"""Simple examples to demonstrate the usage of Qiskit Terra on the remote IBMQ
+provider."""

examples/python/ibmq/hello_quantum.py

@@ -13,9 +13,11 @@
 """Example used in the README. In this example a Bell state is made."""
 
 # Import Qiskit
+import sys
 from qiskit import QuantumCircuit
 from qiskit import execute, IBMQ, BasicAer
 from qiskit.providers.ibmq import least_busy
+from qiskit.providers.ibmq.exceptions import IBMQProviderError, IBMQAccountCredentialsNotFound
 
 # Create a Quantum Circuit
 qc = QuantumCircuit(2, 2)
@@ -42,13 +44,13 @@
 # Authenticate for access to remote backends
 try:
     provider = IBMQ.load_account()
-except:
+except IBMQAccountCredentialsNotFound:
     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..."""
     )
-    exit(0)
+    sys.exit()
 
 # see a list of available remote backends
 ibmq_backends = provider.backends()
@@ -60,7 +62,7 @@
     least_busy_device = least_busy(
         provider.backends(filters=lambda x: x.configuration().n_qubits >= 2, simulator=False)
     )
-except:
+except IBMQProviderError:
     print("All devices are currently unavailable.")
 
 print("Running on current least busy device: ", least_busy_device)

examples/python/ibmq/using_qiskit_terra_level_0.py

@@ -16,18 +16,18 @@
 This example shows the most basic way to user Terra. It builds some circuits
 and runs them on both the BasicAer (local Qiskit provider) or IBMQ (remote IBMQ provider).
 
-To control the compile parameters we have provided a transpile function which can be used 
+To control the compile parameters we have provided a transpile function which can be used
 as a level 1 user.
 
 """
 
-import time
 
 # Import the Qiskit modules
 from qiskit import QuantumCircuit
 from qiskit import execute, IBMQ, BasicAer
 from qiskit.providers.ibmq import least_busy
 from qiskit.tools.monitor import job_monitor
+from qiskit.providers.ibmq.exceptions import IBMQProviderError
 
 
 provider = IBMQ.load_account()
@@ -64,7 +64,7 @@
 try:
     # select least busy available device and execute.
     least_busy_device = least_busy(provider.backends(simulator=False))
-except:
+except IBMQProviderError:
     print("All devices are currently unavailable.")
 
 print("Running on current least busy device: ", least_busy_device)

examples/python/ibmq/using_qiskit_terra_level_1.py

@@ -33,6 +33,7 @@
 from qiskit.compiler import transpile, assemble
 from qiskit.providers.ibmq import least_busy
 from qiskit.tools.monitor import job_monitor
+from qiskit.providers.ibmq.exceptions import IBMQProviderError
 
 provider = IBMQ.load_account()
 
@@ -63,7 +64,7 @@
 try:
     # select least busy available device and execute.
     least_busy_device = least_busy(provider.backends(simulator=False))
-except:
+except IBMQProviderError:
     print("All devices are currently unavailable.")
 
 print("Running on current least busy device: ", least_busy_device)

examples/python/ibmq/using_qiskit_terra_level_2.py

@@ -35,6 +35,8 @@
 from qiskit.transpiler.passes import CXDirection
 from qiskit.transpiler.passes import LookaheadSwap
 
+from qiskit.providers.ibmq.exceptions import IBMQProviderError
+
 
 provider = IBMQ.load_account()
 
@@ -68,7 +70,7 @@
 try:
     # select least busy available device and execute.
     least_busy_device = least_busy(provider.backends(simulator=False))
-except:
+except IBMQProviderError:
     print("All devices are currently unavailable.")
 
 print("Running on current least busy device: ", least_busy_device)

tox.ini

@@ -24,6 +24,7 @@ basepython = python3
 commands =
   black --check {posargs} qiskit test tools examples setup.py
   pylint -rn qiskit test tools
+  pylint -rn --disable='C0103, W0621, E0611, E0401' examples
   {toxinidir}/tools/verify_headers.py qiskit test tools examples
   {toxinidir}/tools/find_optional_imports.py
   reno lint