diff -r 54dc01ff643b lib-python/2.7/zipfile.py
--- a/lib-python/2.7/zipfile.py	Tue May 02 11:00:13 2017 -0700
+++ b/lib-python/2.7/zipfile.py	Thu May 18 15:27:16 2017 +0300
@@ -622,19 +622,22 @@
         """Read and return up to n bytes.
         If the argument is omitted, None, or negative, data is read and returned until EOF is reached..
         """
-        buf = ''
+        buf = []
+        lenbuf = 0
         if n is None:
             n = -1
         while True:
             if n < 0:
                 data = self.read1(n)
-            elif n > len(buf):
-                data = self.read1(n - len(buf))
+            elif n > lenbuf:
+                data = self.read1(n - lenbuf)
             else:
-                return buf
+                break
             if len(data) == 0:
-                return buf
-            buf += data
+                break
+            lenbuf += len(data)
+            buf.append(data)
+        return ''.join(buf)
 
     def _update_crc(self, newdata, eof):
         # Update the CRC using the given data.
@@ -874,9 +877,7 @@
 
     def namelist(self):
         """Return a list of file names in the archive."""
-        l = []
-        for data in self.filelist:
-            l.append(data.filename)
+        l = [data.filename for data in self.filelist]
         return l
 
     def infolist(self):
@@ -1039,7 +1040,6 @@
         """
         if members is None:
             members = self.namelist()
-
         for zipinfo in members:
             self.extract(zipinfo, path, pwd)
 
@@ -1082,11 +1082,9 @@
             if not os.path.isdir(targetpath):
                 os.mkdir(targetpath)
             return targetpath
-
         with self.open(member, pwd=pwd) as source, \
-             file(targetpath, "wb") as target:
-            shutil.copyfileobj(source, target)
-
+             open(targetpath, "wb") as target:
+            shutil.copyfileobj(source, target, length = 128 * 1024)
         return targetpath
 
     def _writecheck(self, zinfo):