Trac #33213: replace SAGE_TMP in glpk backend.

src/sage/numerical/backends/glpk_backend.pyx

@@ -1807,10 +1807,13 @@ cdef class GLPKBackend(GenericBackend):
             1
             sage: p.add_linear_constraint([[0, 1], [1, 2]], None, 3)
             sage: p.set_objective([2, 5])
-            sage: fnam = os.path.join(SAGE_TMP, "lp_problem.lp")
-            sage: p.write_lp(fnam)
+            sage: import tempfile
+            sage: with tempfile.TemporaryDirectory() as d:
+            ....:     fnam = os.path.join(d, "lp_problem.lp")
+            ....:     _ = p.write_lp(fnam)
+            ....:     len([(x,y) for x,y in enumerate(open(fnam,"r"))])
             ...
-            sage: len([(x,y) for x,y in enumerate(open(fnam,"r"))])
+            9 lines were written
             9
         """
         filename = str_to_bytes(filename, FS_ENCODING, 'surrogateescape')
@@ -1832,10 +1835,13 @@ cdef class GLPKBackend(GenericBackend):
             1
             sage: p.add_linear_constraint([[0, 1], [1, 2]], None, 3)
             sage: p.set_objective([2, 5])
-            sage: fnam = os.path.join(SAGE_TMP, "lp_problem.mps")
-            sage: p.write_mps(fnam, 2)
+            sage: import tempfile
+            sage: with tempfile.TemporaryDirectory() as d:
+            ....:     fnam = os.path.join(d, "lp_problem.mps")
+            ....:     _ = p.write_mps(fnam, 2)
+            ....:     len([(x,y) for x,y in enumerate(open(fnam,"r"))])
             ...
-            sage: len([(x,y) for x,y in enumerate(open(fnam,"r"))])
+            17 records were written
             17
         """
         filename = str_to_bytes(filename, FS_ENCODING, 'surrogateescape')
@@ -2471,11 +2477,13 @@ cdef class GLPKBackend(GenericBackend):
             1
             sage: p.solve()
             0
-            sage: p.print_ranges() # this writes out "ranges.tmp"
+            sage: import tempfile
+            sage: with tempfile.TemporaryDirectory() as d:
+            ....:     fnam = os.path.join(d, "ranges.tmp")
+            ....:     p.print_ranges(fnam)
+            ....:     for ll in open(fnam, "r"):
+            ....:         if ll != '': print(ll)
             ...
-            sage: fnam = os.path.join(SAGE_TMP, "ranges.tmp")
-            sage: for ll in open(fnam, "r"):
-            ....:     if ll != '': print(ll)
             GLPK ... - SENSITIVITY ANALYSIS REPORT                                                                         Page   1
             Problem:
             Objective:  7.5 (MAXimum)
@@ -2496,25 +2504,20 @@ cdef class GLPKBackend(GenericBackend):
                                                         .               +Inf        1.50000          +Inf          +Inf
             End of report
         """
-
-        from sage.misc.misc import SAGE_TMP
-
-        if filename is None:
-            fname = SAGE_TMP + "/ranges.tmp"
-        else:
-            fname = filename
-
+        import os, tempfile
+        f = tempfile.NamedTemporaryFile(delete=False); f.close()
         res = glp_print_ranges(self.lp, 0, 0, 0,
-                               str_to_bytes(fname, FS_ENCODING,
+                               str_to_bytes(f.name, FS_ENCODING,
                                             'surrogateescape'))
-
-        if filename is None:
-            if res == 0:
-                with open(fname) as f:
-                    for line in f:
+        if filename is not None:
+            os.rename(f.name, filename)
+        else:
+            if res == 0:  # success
+                with open(f.name) as fh:
+                    for line in fh:
                         print(line, end=" ")
                 print("\n")
-
+            os.remove(f.name)
         return res
 
     cpdef double get_row_dual(self, int variable):