diff --git a/include/pocketpy/pocketpy.h b/include/pocketpy/pocketpy.h
index 955b2a10..117208ad 100644
--- a/include/pocketpy/pocketpy.h
+++ b/include/pocketpy/pocketpy.h
@@ -68,6 +68,8 @@ typedef struct py_Callbacks {
     char* (*importfile)(const char*);
     /// Used by `print` to output a string.
     void (*print)(const char*);
+    /// Flush the output buffer of `print`.
+    void (*flush)();
     /// Used by `input` to get a character.
     int (*getchar)();
 } py_Callbacks;
diff --git a/src/interpreter/vm.c b/src/interpreter/vm.c
index a14e2816..667086f2 100644
--- a/src/interpreter/vm.c
+++ b/src/interpreter/vm.c
@@ -29,6 +29,8 @@ static char* pk_default_importfile(const char* path) {
 
 static void pk_default_print(const char* data) { printf("%s", data); }
 
+static void pk_default_flush() { fflush(stdout); }
+
 static void py_TypeInfo__ctor(py_TypeInfo* self,
                               py_Name name,
                               py_Type index,
@@ -67,6 +69,7 @@ void VM__ctor(VM* self) {
 
     self->callbacks.importfile = pk_default_importfile;
     self->callbacks.print = pk_default_print;
+    self->callbacks.flush = pk_default_flush;
     self->callbacks.getchar = getchar;
 
     self->last_retval = *py_NIL();
diff --git a/src/modules/pkpy.c b/src/modules/pkpy.c
index 79cac762..8b68dafe 100644
--- a/src/modules/pkpy.c
+++ b/src/modules/pkpy.c
@@ -65,6 +65,14 @@ static bool pkpy_is_user_defined_type(int argc, py_Ref argv) {
     return true;
 }
 
+static bool pkpy_enable_full_buffering_mode(int argc, py_Ref argv) {
+    PY_CHECK_ARGC(0);
+    static char buf[1024 * 1024 * 1];
+    setvbuf(stdout, buf, _IOFBF, sizeof(buf));
+    py_newnone(py_retval());
+    return true;
+}
+
 static bool pkpy_currentvm(int argc, py_Ref argv) {
     PY_CHECK_ARGC(0);
     py_newint(py_retval(), py_currentvm());
@@ -411,7 +419,9 @@ static void pk_ComputeThread__register(py_Ref mod) {
 
     py_bindmethod(type, "submit_exec", ComputeThread_submit_exec);
     py_bindmethod(type, "submit_eval", ComputeThread_submit_eval);
-    py_bind(py_tpobject(type), "submit_call(self, eval_src, *args, **kwargs)", ComputeThread_submit_call);
+    py_bind(py_tpobject(type),
+            "submit_call(self, eval_src, *args, **kwargs)",
+            ComputeThread_submit_call);
 
     py_bindmethod(type, "exec", ComputeThread_exec);
     py_bindmethod(type, "eval", ComputeThread_eval);
@@ -453,6 +463,7 @@ void pk__add_module_pkpy() {
 
     py_bindfunc(mod, "memory_usage", pkpy_memory_usage);
     py_bindfunc(mod, "is_user_defined_type", pkpy_is_user_defined_type);
+    py_bindfunc(mod, "enable_full_buffering_mode", pkpy_enable_full_buffering_mode);
 
     py_bindfunc(mod, "currentvm", pkpy_currentvm);
 
diff --git a/src/public/modules.c b/src/public/modules.c
index b4af2af9..b6c5c694 100644
--- a/src/public/modules.c
+++ b/src/public/modules.c
@@ -200,12 +200,12 @@ static bool builtins_input(int argc, py_Ref argv) {
         if(!py_checkstr(argv)) return false;
         prompt = py_tostr(argv);
     }
-    pk_current_vm->callbacks.print(prompt);
+    py_callbacks()->print(prompt);
 
     c11_sbuf buf;
     c11_sbuf__ctor(&buf);
     while(true) {
-        int c = pk_current_vm->callbacks.getchar();
+        int c = py_callbacks()->getchar();
         if(c == '\n' || c == '\r') break;
         if(c == EOF) break;
         c11_sbuf__write_char(&buf, c);
@@ -323,11 +323,15 @@ static bool builtins_round(int argc, py_Ref argv) {
 }
 
 static bool builtins_print(int argc, py_Ref argv) {
-    // print(*args, sep=' ', end='\n')
+    // print(*args, sep=' ', end='\n', flush=False)
     py_TValue* args = py_tuple_data(argv);
     int length = py_tuple_len(argv);
+    PY_CHECK_ARG_TYPE(1, tp_str);
+    PY_CHECK_ARG_TYPE(2, tp_str);
+    PY_CHECK_ARG_TYPE(3, tp_bool);
     c11_sv sep = py_tosv(py_arg(1));
     c11_sv end = py_tosv(py_arg(2));
+    bool flush = py_tobool(py_arg(3));
     c11_sbuf buf;
     c11_sbuf__ctor(&buf);
     for(int i = 0; i < length; i++) {
@@ -340,7 +344,8 @@ static bool builtins_print(int argc, py_Ref argv) {
     }
     c11_sbuf__write_sv(&buf, end);
     c11_string* res = c11_sbuf__submit(&buf);
-    pk_current_vm->callbacks.print(res->data);
+    py_callbacks()->print(res->data);
+    if(flush) py_callbacks()->flush();
     c11_string__delete(res);
     py_newnone(py_retval());
     return true;
@@ -722,7 +727,7 @@ py_TValue pk_builtins__register() {
     py_bindfunc(builtins, "divmod", builtins_divmod);
     py_bindfunc(builtins, "round", builtins_round);
 
-    py_bind(builtins, "print(*args, sep=' ', end='\\n')", builtins_print);
+    py_bind(builtins, "print(*args, sep=' ', end='\\n', flush=False)", builtins_print);
 
     py_bindfunc(builtins, "isinstance", builtins_isinstance);
     py_bindfunc(builtins, "issubclass", builtins_issubclass);