diff -ur v12/ezyaml.c v13/ezyaml.c
--- v12/ezyaml.c	2018-09-08 17:12:53.000000000 +0900
+++ v13/ezyaml.c	2018-09-08 18:08:45.000000000 +0900
@@ -475,7 +475,7 @@
 /**/
 
 struct obj *dump_list(struct obj *lst, int idt);
-struct obj *dump_value(struct obj *obj);
+struct obj *dump_value(struct obj *obj, int dic_right);
 struct obj *dump_other(struct obj *obj, int idt);
 struct obj *dump_obj(struct obj *obj, int idt);
 
@@ -500,7 +500,7 @@
 			str = dump_dict(v, idt+2);
 		}else{
 			str = str_append(str, " ");
-			tmp = dump_value(v);
+			tmp = dump_value(v, 1);
 			str = str_append( str, obj_buf(tmp) );
 			obj_del(tmp);
 		}
@@ -569,7 +569,7 @@
 }
 
 struct obj *
-dump_value(struct obj *obj)
+dump_value(struct obj *obj, int dic_right)
 {
 	if(obj->typ == OBJ_TYP_STR){
 		struct obj *str;
@@ -578,6 +578,17 @@
 		int q1 = strchr(s, '\'') != NULL;
 		int cl = strchr(s, ':') != NULL;
 
+		if(cl && dic_right){
+			char *t = s;
+			cl = 0;
+			while( ( t = strchr(t, ':') ) ){
+				t++;
+				if(*t == '\0' || t[0] == ' '){
+					cl = 1;
+					break;
+				}
+			}
+		}
 		if(q2 && q1){
 			s = cp_replace(s, "'", "\\'");
 			q1 = 0;
@@ -602,7 +613,7 @@
 	}
 
 	if(obj->typ == OBJ_TYP_BOOL){
-		return str_new(obj->any.i ? "True" : "False");
+		return str_new(obj->any.i ? "true" : "false");
 	}
 	if(obj->typ == OBJ_TYP_INT){
 		char buf[1024];
@@ -620,7 +631,7 @@
 struct obj *
 dump_other(struct obj *obj, int idt)
 {
-	struct obj *str = dump_value(obj);
+	struct obj *str = dump_value(obj, 0);
 	char *s = malloc(idt+1);
 	memset(s, ' ', idt);
 	s[idt] = '\0';
diff -ur v12/ezyaml.py v13/ezyaml.py
--- v12/ezyaml.py	2018-09-06 02:13:01.000000000 +0900
+++ v13/ezyaml.py	2018-09-08 18:08:45.000000000 +0900
@@ -206,7 +206,7 @@
 			lines.append(s)
 			s = dump_dict(v, idt+2)
 		else:
-			s += ' ' + dump_value(v)
+			s += ' ' + dump_value(v, dic_right=True)
 		lines.append(s)
 	return '\n'.join(lines)
 
@@ -228,10 +228,18 @@
 
 	return False
 
-def dump_value(obj):
+def dump_value(obj, dic_right=False):
 	if type(obj) == str:
 		s = obj
 		(q2, q1, cl) = map( lambda t: t in s, ('"', "'", ':') )
+		if cl and dic_right:
+			t = s
+			cl = False
+			while ':' in t:
+				t = t[ t.index(':')+1 : ]
+				if not t or t[0] == ' ':
+					cl = True
+					break
 		if q2 and q1:
 			s = s.replace("'", "\\'")
 			q1 = False
@@ -246,8 +254,12 @@
 	if type(obj) == dict:
 		return '{}'
 
-	if obj == None:
+	if obj is None:
 		return 'null'
+	if obj is True:
+		return 'true'
+	if obj is False:
+		return 'false'
 
 	return '{}'.format(obj)