Use context manager

--HG--
extra : amend_source : 5e98bee2918d9eeb073c8c896a849c5f68da6634

setuptools/package_index.py

@@ -632,7 +632,7 @@ class PackageIndex(Environment):
                     shutil.copy2(filename, dst)
                     filename=dst
 
-            file = open(os.path.join(tmpdir, 'setup.py'), 'w')
+            with open(os.path.join(tmpdir, 'setup.py'), 'w') as file:
                 file.write(
                     "from setuptools import setup\n"
                     "setup(name=%r, version=%r, py_modules=[%r])\n"
@@ -641,7 +641,6 @@ class PackageIndex(Environment):
                         os.path.splitext(basename)[0]
                     )
                 )
-            file.close()
             return filename
 
         elif match:
@@ -660,7 +659,7 @@ class PackageIndex(Environment):
     def _download_to(self, url, filename):
         self.info("Downloading %s", url)
         # Download the file
-        fp, tfp, info = None, None, None
+        fp, info = None, None
         try:
             checker = HashChecker.from_url(url)
             fp = self.open_url(strip_fragment(url))
@@ -677,7 +676,7 @@ class PackageIndex(Environment):
                 sizes = get_all_headers(headers, 'Content-Length')
                 size = max(map(int, sizes))
                 self.reporthook(url, filename, blocknum, bs, size)
-            tfp = open(filename,'wb')
+            with open(filename,'wb') as tfp:
                 while True:
                     block = fp.read(bs)
                     if block:
@@ -691,7 +690,6 @@ class PackageIndex(Environment):
             return headers
         finally:
             if fp: fp.close()
-            if tfp: tfp.close()
 
     def reporthook(self, url, filename, blocknum, blksize, size):
         pass    # no-op
@@ -1040,9 +1038,8 @@ def local_open(url):
         files = []
         for f in os.listdir(filename):
             if f=='index.html':
-                fp = open(os.path.join(filename,f),'r')
+                with open(os.path.join(filename,f),'r') as fp:
                     body = fp.read()
-                fp.close()
                 break
             elif os.path.isdir(os.path.join(filename,f)):
                 f+='/'