ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.al
2018-03-08 11:10
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解决方案
本文中的解决方法，只限于一部分问题，可能不通用。因为楼主在跑python代码时经常遇到这个问题，以前是怎么解决的都已经忘记了，今天又查了一大通，故记录下来：training_examples["latitude_0_to_35"]=1 if (training_examples["latitude"]>=0 and training_examples["latitude"]<=35) else 0 # 想用这样的赋值语句，结果报错了（PS: training_examples是dataframe类型） ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()
故想实现上面的方法，改用如下方案：
training_examples["latitude_0_to_35"]= (training_examples["latitude"]>=0) & (training_examples["latitude"]<=35)
# 此处用 & 应该是因为training_examples["latitude"]存在多个value值，得“按位”比较。如果是单纯的数值用and就是可以的，可见最后的例子。
training_examples["latitude_0_to_35"] = training_examples["latitude_0_to_35"].astype('int')
#这一步是将得到的true和false转化为1和0，直接bool型变为int型
IN: a = 1 if (3>2 and 4>3) else 0
IN: a
OUT: 1
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