From 76137308ab41e1b0c714a7407143648463cdde6f Mon Sep 17 00:00:00 2001
From: bxdd <bxddream@gmail.com>
Date: Tue, 29 Sep 2020 21:30:04 +0800
Subject: [PATCH] add the cython import error log in repository directory

---
 docs/start/initialization.rst |  3 ++-
 docs/start/installation.rst   |  3 ---
 qlib/data/ops.py              | 10 ++++++++--
 3 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/docs/start/initialization.rst b/docs/start/initialization.rst
index 24b270d62..00d5dd477 100644
--- a/docs/start/initialization.rst
+++ b/docs/start/initialization.rst
@@ -28,7 +28,8 @@ Please follow the steps below to initialize ``Qlib``.
         provider_uri = "~/.qlib/qlib_data/cn_data"  # target_dir
         qlib.init(provider_uri=provider_uri, region=REG_CN)
     
-
+.. note::
+   Do not import qlib package in the repository directory  of ``Qlib``, otherwise, errors may occur.
 
 Parameters
 -------------------
diff --git a/docs/start/installation.rst b/docs/start/installation.rst
index 48daad310..063363766 100644
--- a/docs/start/installation.rst
+++ b/docs/start/installation.rst
@@ -27,9 +27,6 @@ Please follow the steps below to install ``Qlib``:
 
 .. note::
    It's recommended to use anaconda/miniconda to setup the environment. ``Qlib`` needs lightgbm and pytorch packages, use pip to install them.
-
-.. note::
-   Do not import qlib in the root directory of ``Qlib``, otherwise, errors may occur.
    
 
 
diff --git a/qlib/data/ops.py b/qlib/data/ops.py
index ca85baf6c..717f73701 100644
--- a/qlib/data/ops.py
+++ b/qlib/data/ops.py
@@ -9,10 +9,16 @@ import numpy as np
 import pandas as pd
 
 from .base import Expression, ExpressionOps
-from ._libs.rolling import rolling_slope, rolling_rsquare, rolling_resi
-from ._libs.expanding import expanding_slope, expanding_rsquare, expanding_resi
 from ..log import get_module_logger
 
+try:
+    from ._libs.rolling import rolling_slope, rolling_rsquare, rolling_resi
+    from ._libs.expanding import expanding_slope, expanding_rsquare, expanding_resi
+except ImportError as err:
+    print(err)
+    print('Do not import qlib package in the repository directory')
+    exit(-1)
+
 __all__ = (
     "Ref",
     "Max",