Merge pull request #1118 from skirpichev/3.9

Drop support for CPython 3.7

.github/workflows/test.yml

@@ -8,10 +8,10 @@ jobs:
   test:
     strategy:
       matrix:
-        python-version: [3.7, 3.8, 3.9]
+        python-version: [3.8, 3.9]
         coverage: [false]
         include:
-          - python-version: 3.7
+          - python-version: 3.9
             coverage: true
     runs-on: ubuntu-latest
     env:

.gitignore

@@ -9,6 +9,7 @@
 
 # Regular Python bytecode file
 *.pyc
+__pycache__/
 
 # Optimized Python bytecode file
 *.pyo

.readthedocs.yml

@@ -3,9 +3,9 @@ formats:
     - htmlzip
     - pdf
 build:
-    image: stable
+    image: latest
 python:
-    version: 3.7
+    version: 3.8
     install:
         - method: pip
           path: .

diofant/core/function.py

@@ -1449,6 +1449,7 @@ def mystr(expr, **settings):
                    for _, r in reps):
                 pre += '_'
                 continue
+            reps  # XXX "peephole" optimization, http://bugs.python.org/issue2506
             break
 
         obj = Expr.__new__(cls, expr, *sympify(tuple(zip(variables, point))))

diofant/interactive/session.py

@@ -75,7 +75,6 @@ def visit_Constant(self, node):
                             args=[ast.Str(s=repr(node.n))], keywords=[],
                             starargs=None, kwargs=None)
         return node
-    visit_Num = visit_Constant
 
     def visit_Call(self, node):
         if isinstance(node.func, ast.Name) and node.func.id == 'Float':

diofant/polys/factortools.py

@@ -28,6 +28,7 @@ def _trial_division(self, f, factors):
                 if r.is_zero:
                     f, k = q, k + 1
                 else:
+                    r  # XXX "peephole" optimization, http://bugs.python.org/issue2506
                     break
 
             result.append((factor, k))

diofant/polys/polyfuncs.py

@@ -100,6 +100,7 @@ def symmetrize(F, *gens, **args):
             if _height != -1:
                 monom, coeff = _monom, _coeff
             else:
+                _height  # XXX "peephole" optimization, http://bugs.python.org/issue2506
                 break
 
             exponents = []

diofant/polys/univar.py

@@ -326,6 +326,7 @@ def decompose(self):
                 f, h = result
                 F = [h] + F
             else:
+                result  # XXX "peephole" optimization, http://bugs.python.org/issue2506
                 break
 
         return [f] + F

diofant/simplify/powsimp.py

@@ -321,6 +321,7 @@ def update(b):
                 if (last  # no more radicals in base
                         or len(common_b) == 1  # nothing left to join with
                         or all(k[1] == 1 for k in common_b)):  # no rad's in common_b
+                    common_b  # XXX "peephole" optimization, http://bugs.python.org/issue2506
                     break
                 # see what we can exponentiate base by to remove any radicals
                 # so we know what to search for

diofant/simplify/ratsimp.py

@@ -169,6 +169,7 @@ def _ratsimpmodprime(a, b, allsol, N=0, D=0):
                 if N + D != maxdeg:
                     allsol = [allsol[-1]]
 
+                N  # XXX "peephole" optimization, http://bugs.python.org/issue2506
                 break
 
             steps += 1

diofant/simplify/trigsimp.py

@@ -1025,6 +1025,7 @@ def __trigsimp(expr, deep=False):
                 was = expr
                 if m[a_t] == 0 or \
                         -m[a_t] in m[c].args or m[a_t] + m[c] == 0:
+                    m  # XXX "peephole" optimization, http://bugs.python.org/issue2506
                     break
                 if d in m and m[a_t]*m[d] + m[c] == 0:
                     break

diofant/solvers/ode.py

@@ -2301,6 +2301,7 @@ def checkodesol(ode, sol, func=None, order='auto', solve_for_func=True):
                 s = simplify(num).xreplace(reps).xreplace({_func: func})
                 testnum += 1
         else:
+            testnum  # XXX "peephole" optimization, http://bugs.python.org/issue2506
             break
 
     if not s:
@@ -4601,6 +4602,7 @@ def _solve_undetermined_coefficients(eq, func, order, match):
                 if check*x**mult in trialset:
                     mult += 1
                 else:
+                    mult  # XXX "peephole" optimization, http://bugs.python.org/issue2506
                     break
             trialset.add(check*x**mult)
             notneedset.add(check)

diofant/solvers/utils.py

@@ -124,6 +124,7 @@ def checksol(f, sol, **flags):
             if flags.get('force', True):
                 # don't do a zero check with the positive assumptions in place
                 val = val.subs(reps)
+            val  # XXX "peephole" optimization, http://bugs.python.org/issue2506
             break
 
         if val == was:

diofant/utilities/enumerative.py

@@ -255,6 +255,7 @@ def multiset_partitions_taocp(multiplicities):
                 f[lpart + 1] = b
                 # Return to M2
             else:
+                k  # XXX "peephole" optimization, http://bugs.python.org/issue2506
                 break  # Continue to M4
 
         # M4  Visit a partition

diofant/utilities/iterables.py

@@ -1196,6 +1196,7 @@ def partitions(n, m=None, k=None, size=False):
             if r:
                 ms[r] = 1
                 keys.append(r)
+            r  # XXX "peephole" optimization, http://bugs.python.org/issue2506
             break
         room -= need
         if size:

docs/install.rst

@@ -3,7 +3,7 @@
 Installation
 ------------
 
-The Diofant can be installed on any computer with Python 3.7
+The Diofant can be installed on any computer with Python 3.8
 or above.  You can install latest release with pip::
 
     pip install diofant

setup.cfg

@@ -25,14 +25,13 @@ classifiers = Development Status :: 4 - Beta
               Topic :: Software Development :: Libraries :: Python Modules
               Programming Language :: Python :: 3
               Programming Language :: Python :: 3 :: Only
-              Programming Language :: Python :: 3.7
               Programming Language :: Python :: 3.8
               Programming Language :: Python :: 3.9
               Programming Language :: Python :: Implementation :: CPython
 [options]
 zip_safe = True
 packages = find:
-python_requires = >=3.7
+python_requires = >=3.8
 setup_requires = setuptools>=36.7.0
                  setuptools_scm
                  pip>=9.0.1