def demo():
    """demo is used to demonstrate typical examples about this class."""
    demostr = """
import clubear as cb
#clubear.csv is generated by cb.manager.demo()
pm=cb.pump('clubear.csv')
pm.qlist=['height','logsales','price','weight']
pt=cb.plot(pm)
pt.hist('logsales')
pt.size('region')
pt.corr()
pt.mu(y='logsales',x='region')
pt.std(y='logsales',x='gender')
pt.box(y='logsales',x='gender')
pt.gbox(y='logsales',x='price')
"""
    print(demostr)
