Skip to main content

_PyErr_ReplaceException for virtualenv in Python 2.7

After upgraded Python 2.7 to latest version, it may occur to _PyErr_ReplaceException sometimes in virtualenv created by former version of python. For example:


>>> import io
Traceback (most recent call last):
  File "", line 1, in 
  File "/usr/lib/python2.7/io.py", line 51, in 
    import _io
ImportError: /home/ubuntu/ikaka/leanStudy/venv/lib/python2.7/lib-dynload/_io.so: undefined symbol: _PyErr_ReplaceException
This is because the virtualenv had copied the python executable binary but linked lib directory. So just replace the python executable binary in virtualenv with the one in /usr/lib, like


cp /usr/bin/python /bin/python
Labels:

Comments

Post a Comment

Popular posts from this blog

A simple implementation of DTW(Dynamic Time Warping) in C#/python

DTW(Dynamic Time Warping) is a very useful tools for time series analysis. This is a very simple (but not very efficient) c# implementation of DTW, the source code is available at  https://gist.github.com/1966342  . Use the program as below: double[] x = {9,3,1,5,1,2,0,1,0,2,2,8,1,7,0,6,4,4,5}; double[] y = {1,0,5,5,0,1,0,1,0,3,3,2,8,1,0,6,4,4,5}; SimpleDTW dtw = new SimpleDTW(x,y); dtw.calculateDTW(); The python implementation is available at  https://gist.github.com/3265694  . from python-dtw import Dtw import math dtw = Dtw([1, 2, 3, 4, 6], [1, 2, 3, 5],           distance_func=lambda x, y: math.fabs(x - y)) print dtw.calculate() #calculate the distance print dtw.get_path() #calculate the mapping path
14 comments
Read more

Install mysql-python with mariadb

mysql-python requires libmysqlclient-dev in ubuntu, but the installation of mariadb will have the lib with unmet dependenccies, so the error of "mysql_config not found" may occurred if you install mysql-python via pip. The case is that mariadb has a compatible package, if you have the ppa setup as in  http://downloads.mariadb.org/ . Just "sudo apt-get install libmariadbclient-dev".
2 comments
Read more

PrefixSpan source code in python

The prefixspan is a key algorithm for mining sequential patterns. I have implemented the algorithm in Python. The algorithm is based on the following paper: Jian Pei, Jiawei Han, Senior Member, Behzad Mortazavi-asl, Jianyong Wang, Helen Pinto, Qiming Chen, Umeshwar Dayal. Mining Sequential Patterns by Pattern-Growth: The PrefixSpan Approach. IEEE Transactions on Knowledge and Data Engineering, 2004. or their conference paper You may download the source code at the following addresses: Link1
4 comments
Read more