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使用如下方法对DataFrame进行数据过虑：
import pandas as pd
data = pd.read_csv('Haiti.csv')
print data[data['LATITUDE']>18 and data['LATITUDE']<20]或
import pandas as pd
data = pd.read_csv('Haiti.csv')
print data[data.LATITUDE>18 and data.LATITUDE<20]均会出现错误“ValueError: The truth value of a Series is ambiguous. Use a.empty, a.bool(), a.item(), a.any() or a.all().”
正确的做法是：
import pandas as pd
data = pd.read_csv('Haiti.csv')
print data[(data.LATITUDE>18) & (data.LATITUDE<20)]