Add file_readlines

src/runtime/str.cpp

@@ -1833,6 +1833,23 @@ extern "C" int _PyString_Resize(PyObject** pv, Py_ssize_t newsize) noexcept {
     return 0;
 }
 
+extern "C" void PyString_Concat(register PyObject** pv, register PyObject* w) noexcept {
+    try {
+        if (*pv == NULL)
+            return;
+
+        if (w == NULL || !PyString_Check(*pv)) {
+            *pv = NULL;
+            return;
+        }
+
+        *pv = strAdd((BoxedString*)*pv, w);
+    } catch (ExcInfo e) {
+        setCAPIException(e);
+        *pv = NULL;
+    }
+}
+
 extern "C" void PyString_ConcatAndDel(register PyObject** pv, register PyObject* w) noexcept {
     Py_FatalError("unimplemented");
 }

src/runtime/types.cpp

@@ -1139,6 +1139,8 @@ void setupRuntime() {
 
     closure_cls->freeze();
 
+    setupCAPI();
+
     setupBool();
     setupInt();
     setupLong();
@@ -1206,8 +1208,6 @@ void setupRuntime() {
     setupThread();
     setupGC();
 
-    setupCAPI();
-
     PyType_Ready(&PyCapsule_Type);
 
     initerrno();

test/tests/file.py

@@ -39,6 +39,9 @@ with open('README.md') as f:
     print lines[:5]
     print lines[-5:]
 
+with open('README.md') as f:
+    print len(f.readlines())
+
 # Check that opening a non-existent file results in an IOError.
 try:
    f = open('this-should-definitely-not-exist.txt')
@@ -46,6 +49,6 @@ except IOError as e:
    print str(e)
 
 f = open("/dev/null", "w")
-f.write("hello world")
+print f.write("hello world")
 print f.flush()
-f.close()
+print f.close()