如何修复python中系列错误的真值

Question

if train['Item_Fat_Content']=='LF':
    train['Item_Fat_Content']='Low Fat'

error :

The truth value of a Series is ambiguous. Use a.empty, a.bool(), a.item(), a.any() or a.all().

Answer 1

You are asking whether the entire column ['Item_Fat_Content'] is LF , which isn't a meaningful comparison. Instead, you can use str.replace :

train['Item_Fat_Content']=train['Item_Fat_Content'].str.replace('LF', 'Low Fat')