[fix #542] close file descriptors again

CHANGELOG.md

@@ -1,7 +1,9 @@
 # CHANGELOG
+
 ## Unreleased
 ### Added
 ### Fixed
+- close file descriptors after file operation is finished
 ### Changed
 ### Removed
 

src/pyscipopt/scip.pyx

@@ -10,7 +10,7 @@ cimport cython
 from cpython cimport Py_INCREF, Py_DECREF
 from cpython.pycapsule cimport PyCapsule_New, PyCapsule_IsValid, PyCapsule_GetPointer
 from libc.stdlib cimport malloc, free
-from libc.stdio cimport fdopen
+from libc.stdio cimport fdopen, fclose
 
 from collections.abc import Iterable
 from itertools import repeat
@@ -4101,6 +4101,7 @@ cdef class Model:
         with open(filename, "w") as f:
             cfile = fdopen(f.fileno(), "w")
             PY_SCIP_CALL(SCIPprintBestSol(self._scip, cfile, write_zeros))
+            fclose(cfile)
 
     def writeSol(self, Solution solution, filename="origprob.sol", write_zeros=False):
         """Write the given primal solution to a file.
@@ -4115,6 +4116,7 @@ cdef class Model:
         with open(filename, "w") as f:
             cfile = fdopen(f.fileno(), "w")
             PY_SCIP_CALL(SCIPprintSol(self._scip, solution.sol, cfile, write_zeros))
+            fclose(cfile)
 
     # perhaps this should not be included as it implements duplicated functionality
     #   (as does it's namesake in SCIP)
@@ -4460,6 +4462,7 @@ cdef class Model:
       with open(filename, "w") as f:
           cfile = fdopen(f.fileno(), "w")
           PY_SCIP_CALL(SCIPprintStatistics(self._scip, cfile))
+          fclose(cfile)
 
     def getNLPs(self):
         """gets total number of LPs solved so far"""