update demo & docs

Author: SunRunAway

docs/README.md

@@ -262,7 +262,9 @@ import qiniu.io
 extra = qiniu.io.PutExtra()
 extra.mime_type = "text/plain"
 
-ret, err = qiniu.io.put(uptoken, key, "hello!", extra)
+# data 可以是str或read()able对象
+data = StringIO.StringIO("hello!")
+ret, err = qiniu.io.put(uptoken, key, data, extra)
 if err is not None:
 	error(err)
 	return

docs/demo.py

@@ -1,6 +1,7 @@
 # -*- coding: utf-8 -*-
 import os
 import sys
+import StringIO
 
 # @gist import_io
 import qiniu.io
@@ -112,7 +113,9 @@ def put_binary():
 	extra = qiniu.io.PutExtra()
 	extra.mime_type = "text/plain"
 
-	ret, err = qiniu.io.put(uptoken, key, "hello!", extra)
+	# data 可以是str或read()able对象
+	data = StringIO.StringIO("hello!")
+	ret, err = qiniu.io.put(uptoken, key, data, extra)
 	if err is not None:
 		error(err)
 		return

qiniu/io.py

@@ -20,7 +20,7 @@ class PutExtra(object):
 def put(uptoken, key, data, extra=None):
 	""" put your data to Qiniu
 
-	key, your resource key. if key is None, Qiniu will generate one.
+	If key is None, the server will generate one.
 	data may be str or read()able object.
 	"""
 	fields = {
@@ -55,7 +55,7 @@ def put(uptoken, key, data, extra=None):
 def put_file(uptoken, key, localfile, extra=None):
 	""" put a file to Qiniu
 
-	key, your resource key. if key is None, Qiniu will generate one.
+	If key is None, the server will generate one.
 	"""
 	if extra is not None and extra.check_crc == 1:
 		extra.crc32 = _get_file_crc32(localfile)