Fix misc minor issues

check/pylint

@@ -11,4 +11,4 @@
 cd "$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 cd "$(git rev-parse --show-toplevel)"
 
-pylint --rcfile=dev_tools/conf/.pylintrc $@ src dev_tools examples
+pylint --rcfile=dev_tools/conf/.pylintrc $@ src dev_tools

src/openfermion/__init__.py

@@ -77,7 +77,6 @@
     sy_operator,
     sz_operator,
     majorana_operator,
-    number_operator,
 )
 
 from openfermion.linalg import (

src/openfermion/hamiltonians/richardson_gaudin_test.py

@@ -16,7 +16,7 @@
 
 from openfermion.hamiltonians import RichardsonGaudin
 from openfermion.ops import QubitOperator
-from openfermion.transforms import get_fermion_operator
+#from openfermion.transforms import get_fermion_operator
 from openfermion.transforms import jordan_wigner
 from openfermion.linalg import get_sparse_operator
 from openfermion import get_fermion_operator, InteractionOperator, normal_ordered

src/openfermion/resource_estimates/sf/factorize_sf.py

@@ -1,5 +1,6 @@
 # coverage:ignore
-""" Single factorization of the ERI tensor """
+"""Single factorization of the ERI tensor"""
+import sys
 import numpy as np
 from openfermion.resource_estimates.utils import eigendecomp
 

src/openfermion/transforms/opconversions/term_reordering_test.py

@@ -50,7 +50,7 @@ def test_form(self):
         random_operator = get_fermion_operator(random_interaction_operator(n_qubits))
         chemist_operator = chemist_ordered(random_operator)
         for term, _ in chemist_operator.terms.items():
-            if len(term) == 2 or not len(term):
+            if len(term) == 2 or not term:
                 pass
             else:
                 self.assertTrue(term[0][1])