1.pip install lettuce
2.lettuce的时候报错了
信息主要是：pkg_resources.DistributionNotFound
解决方案：
pip install -U setuptools
3.继续lettuce
c:\Python27\Lib\site-packages>lettuce
c:\Python27\lib\site-packages\fuzzywuzzy\fuzz.py:33: UserWarning: Using slow pure-python SequenceMat
cher. Install python-Levenshtein to remove this warning
warnings.warn('Using slow pure-python SequenceMatcher. Install python-Levenshtein to remove this w
arning')
Oops!
could not find features at \features
说明 lettuce 已经安装成功；因为还没有创建 lettuce 项目，所会提示:“哎在features 目录下不能发现 features”,lettuce 期望在当前目录下创建 features 子目录