diff -ur v1/ezyaml.py v2/ezyaml.py
--- v1/ezyaml.py	2018-08-29 13:48:48.000000000 +0900
+++ v2/ezyaml.py	2018-08-30 22:20:21.000000000 +0900
@@ -3,13 +3,55 @@
 import sys
 
 def err(t, s):
-	sys.stderr.write('err {} "{}\n"'.format(t, s))
+	sys.stderr.write('err {} "{}"\n'.format(t, s))
 	sys.exit(1)
 
+qts = ('"', "'")
+
+def parse(s):
+	lst = ['']
+	in_esc = False
+	qt = None
+
+	while s:
+		(c, s) = ( s[:1], s[1:] )
+
+		if not in_esc and c == '\\':
+			esc = True
+			continue
+		if in_esc:
+			in_esc = False
+			lst[-1] += c
+			continue
+		if qt:
+			if c in qts:
+				lst[-1] += c
+				lst += ''
+				qt = None
+				continue
+		elif c in qts:
+			qt = c
+			if lst[-1]:
+				lst += ''
+		lst[-1] += c
+
+	while len(lst) > 1 and lst[-1] == '':
+		lst.pop()
+	return lst
+
+def find_colon_idx(s):
+	idx = 0
+	lst = parse(s)
+	for s in lst:
+		if ( s[:1] not in qts  ) and ( ':' in s ):
+			return idx + s.index(':')
+		idx += len(s)
+	return -1
+
 def get_kind(s):
 	if s.startswith('- '):
 		return 'list'
-	if ':' in s:
+	if find_colon_idx(s) >= 0:
 		return 'dict'
 	return 'other'
 
@@ -28,22 +70,23 @@
 		if idt_ == idt+2:
 			return get_dict(idt_, lines)
 		elif idt_ > idt:
-			err('indent', s)
+			err('indent dict', s)
 	elif kind_ == 'list':
 		if idt_ == idt+2 or idt_ == idt:
 			return get_list(idt_, lines)
 		elif idt_ > idt:
-			err('indent', s)
+			err('indent list', s)
 	else:
 		if idt_ == idt+2:
 			return get_other(idt_, lines)
 		elif idt_ >= idt:
-			err('indent', s)
+			err('indent other', s)
 	return None
 
 def get_dict(idt, lines):
 	s = lines.pop(0)[idt:]
-	(k, v) = s.split(':')
+	idx = find_colon_idx(s)
+	(k, v) = ( s[:idx], s[idx+1:] )
 	k = get_value( k.strip() )
 	v = get_value( v.strip() )
 
@@ -81,8 +124,8 @@
 	except ValueError:
 		pass
 
-	(h, t) = ( s[:1], s[-1:] )
-	if h == t and h in ('"', "'"):
+	lst = parse(s)
+	if len(lst) == 1 and s[:1] in qts:
 		s = s[1:-1]
 	return s
 
@@ -135,10 +178,18 @@
 	return '\n'.join(lines)
 
 def dump_value(obj):
-	s = '{}'.format(obj)
-	if type(obj) == str and type( get_value(s) ) != str:
-		s = "'" + s + "'"
-	return s
+	if type(obj) == str:
+		s = obj
+		(q2, q1, cl) = map( lambda t: t in s, ('"', "'", ':') )
+		if q2 and q1:
+			s = s.replace("'", "\\'")
+			q1 = False
+		if q2 or q1 or cl:
+			qt = '"' if q1 else "'"
+			s = qt + s + qt
+		return s
+
+	return '{}'.format(obj)
 
 def dump_other(obj, idt):
 	return (' ' * idt) + dump_value(obj)
@@ -156,8 +207,9 @@
 
 if __name__ == "__main__":
 	obj = load( sys.stdin.read() )
-	print('load obj\n{}'.format(obj))
 
 	s = dump(obj)
-	print('dump\n{}'.format(s))
+	print(s)
+
+	sys.stderr.write( '{}\n'.format(obj) )
 # EOF