Remove most uses of module string
diff --git a/Lib/fontTools/ttLib/tables/asciiTable.py b/Lib/fontTools/ttLib/tables/asciiTable.py
index e3a38e1..c65a3b3 100644
--- a/Lib/fontTools/ttLib/tables/asciiTable.py
+++ b/Lib/fontTools/ttLib/tables/asciiTable.py
@@ -1,4 +1,3 @@
-import string
 from . import DefaultTable
 
 
@@ -7,16 +6,16 @@
 	def toXML(self, writer, ttFont):
 		data = self.data
 		# removing null bytes. XXX needed??
-		data = string.split(data, '\0')
-		data = string.join(data, '')
+		data = data.split('\0')
+		data = ''.join(data)
 		writer.begintag("source")
 		writer.newline()
-		writer.write_noindent(string.replace(data, "\r", "\n"))
+		writer.write_noindent(data.replace("\r", "\n"))
 		writer.newline()
 		writer.endtag("source")
 		writer.newline()
 	
 	def fromXML(self, name, attrs, content, ttFont):
-		lines = string.split(string.replace(string.join(content, ""), "\r", "\n"), "\n")
-		self.data = string.join(lines[1:-1], "\r")
+		lines = ''.join(content).replace("\r", "\n").split("\n")
+		self.data = "\r".join(lines[1:-1])