1 files changed, 51 insertions, 52 deletions

diff --git a/src/python/grpcio/support.py b/src/python/grpcio/support.py
index b226e690fd..a228ba4a48 100644
--- a/src/python/grpcio/support.py
+++ b/src/python/grpcio/support.py
@@ -27,7 +27,6 @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-
 import os
 import os.path
 import shutil
@@ -38,7 +37,6 @@ from distutils import errors
 
 import commands
 
-
 C_PYTHON_DEV = """
 #include <Python.h>
 int main(int argc, char **argv) { return 0; }
@@ -55,69 +53,70 @@ Could not find <Python.h>. This could mean the following:
     (check your environment variables or try re-installing?)
 """
 
-C_CHECKS = {
-  C_PYTHON_DEV: C_PYTHON_DEV_ERROR_MESSAGE,
-}
+C_CHECKS = {C_PYTHON_DEV: C_PYTHON_DEV_ERROR_MESSAGE,}
+
 
 def _compile(compiler, source_string):
-  tempdir = tempfile.mkdtemp()
-  cpath = os.path.join(tempdir, 'a.c')
-  with open(cpath, 'w') as cfile:
-    cfile.write(source_string)
-  try:
-    compiler.compile([cpath])
-  except errors.CompileError as error:
-    return error
-  finally:
-    shutil.rmtree(tempdir)
+    tempdir = tempfile.mkdtemp()
+    cpath = os.path.join(tempdir, 'a.c')
+    with open(cpath, 'w') as cfile:
+        cfile.write(source_string)
+    try:
+        compiler.compile([cpath])
+    except errors.CompileError as error:
+        return error
+    finally:
+        shutil.rmtree(tempdir)
+
 
 def _expect_compile(compiler, source_string, error_message):
-  if _compile(compiler, source_string) is not None:
-    sys.stderr.write(error_message)
-    raise commands.CommandError(
-        "Diagnostics found a compilation environment issue:\n{}"
+    if _compile(compiler, source_string) is not None:
+        sys.stderr.write(error_message)
+        raise commands.CommandError(
+            "Diagnostics found a compilation environment issue:\n{}"
             .format(error_message))
 
+
 def diagnose_compile_error(build_ext, error):
-  """Attempt to diagnose an error during compilation."""
-  for c_check, message in C_CHECKS.items():
-    _expect_compile(build_ext.compiler, c_check, message)
-  python_sources = [
-      source for source in build_ext.get_source_files()
-      if source.startswith('./src/python') and source.endswith('c')
-  ]
-  for source in python_sources:
-    if not os.path.isfile(source):
-      raise commands.CommandError(
-          ("Diagnostics found a missing Python extension source file:\n{}\n\n"
-           "This is usually because the Cython sources haven't been transpiled "
-           "into C yet and you're building from source.\n"
-           "Try setting the environment variable "
-           "`GRPC_PYTHON_BUILD_WITH_CYTHON=1` when invoking `setup.py` or "
-           "when using `pip`, e.g.:\n\n"
-           "pip install -rrequirements.txt\n"
-           "GRPC_PYTHON_BUILD_WITH_CYTHON=1 pip install .")
-            .format(source)
-          )
+    """Attempt to diagnose an error during compilation."""
+    for c_check, message in C_CHECKS.items():
+        _expect_compile(build_ext.compiler, c_check, message)
+    python_sources = [
+        source for source in build_ext.get_source_files()
+        if source.startswith('./src/python') and source.endswith('c')
+    ]
+    for source in python_sources:
+        if not os.path.isfile(source):
+            raise commands.CommandError((
+                "Diagnostics found a missing Python extension source file:\n{}\n\n"
+                "This is usually because the Cython sources haven't been transpiled "
+                "into C yet and you're building from source.\n"
+                "Try setting the environment variable "
+                "`GRPC_PYTHON_BUILD_WITH_CYTHON=1` when invoking `setup.py` or "
+                "when using `pip`, e.g.:\n\n"
+                "pip install -rrequirements.txt\n"
+                "GRPC_PYTHON_BUILD_WITH_CYTHON=1 pip install .").format(source))
+
 
 def diagnose_attribute_error(build_ext, error):
-  if any('_needs_stub' in arg for arg in error.args):
-    raise commands.CommandError(
-        "We expect a missing `_needs_stub` attribute from older versions of "
-        "setuptools. Consider upgrading setuptools.")
+    if any('_needs_stub' in arg for arg in error.args):
+        raise commands.CommandError(
+            "We expect a missing `_needs_stub` attribute from older versions of "
+            "setuptools. Consider upgrading setuptools.")
+
 
 _ERROR_DIAGNOSES = {
     errors.CompileError: diagnose_compile_error,
     AttributeError: diagnose_attribute_error
 }
 
-def diagnose_build_ext_error(build_ext, error, formatted):
-  diagnostic = _ERROR_DIAGNOSES.get(type(error))
-  if diagnostic is None:
-    raise commands.CommandError(
-        "\n\nWe could not diagnose your build failure. Please file an issue at "
-        "http://www.github.com/grpc/grpc with `[Python install]` in the title."
-        "\n\n{}".format(formatted))
-  else:
-    diagnostic(build_ext, error)
 
+def diagnose_build_ext_error(build_ext, error, formatted):
+    diagnostic = _ERROR_DIAGNOSES.get(type(error))
+    if diagnostic is None:
+        raise commands.CommandError(
+            "\n\nWe could not diagnose your build failure. Please file an issue at "
+            "http://www.github.com/grpc/grpc with `[Python install]` in the title."
+            "\n\n{}".format(formatted))
+    else:
+        diagnostic(build_ext, error)