1、问题：服务代码需要python2.6运行，安装的扩展需要python2.7以上
解决：指定版本安装

 pip install SQLAlchemy==1.0.9  -i http://pypi.douban.com/simple  --trusted-host pypi.douban.com

import sqlalchemy
print sqlalchemy.__version__

常用pip源:

  阿里云 http://mirrors.aliyun.com/pypi/simple/
  豆瓣(douban) http://pypi.douban.com/simple/
  清华大学 https://pypi.tuna.tsinghua.edu.cn/simple/
  中国科学技术大学 http://pypi.mirrors.ustc.edu.cn/simple/

2、Tornado 错误 “Global name ‘memoryview’ is not defined”
解决：

pip uninstall tornado
pip install tornado==2.1.1

3、mac python2.7安装pip报错：

Installing collected packages: pip
  WARNING: The scripts pip, pip2 and pip2.7 are installed in '/Users/yongmenggan/Library/Python/2.7/bin' which is not on PATH.
  Consider adding this directory to PATH or, if you prefer to suppress this warning, use --no-warn-script-location.

解决：

echo 'export PATH=/Users/yongmenggan/Library/Python/2.7/bin:$PATH' >>~/.bashrc
source ~/.bashrc

4、pip安装zeroc-ice报错：

src/ice/cpp/src/Ice/ConnectionI.cpp:27:21: 致命错误：.....

解决：
原因是缺失相关依赖包 mcpp、bzip2、expat等
安装相关依赖包：

yum install lmdb-devel mcpp-devel
yum install bzip2-devel
yum install expat-devel

如果提示没有相关包，可以执行以下命令：

yum -y install epel-release
yum update

Python 字符串反转义:

str1 = r"teststr" # 加r反转义
str2 = "teststr" #被转义

python3 UnicodeEncodeError: ‘gbk’ codec can’t encode character ‘\xxx’
print输出乱码：

sys.stdout = io.TextIOWrapper(sys.stdout.buffer,encoding='utf8')

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