SettingWithCopyWarning：试图在DataFrame的切片副本上设置一个值
[英]SettingWithCopyWarning: A value is trying to be set on a copy of a slice from a DataFrame
问题描述
for i in range(0,len(donor_df)):
if donor_df['cand_nm'][i] == 'Obama, Barack':
donor_df['Party'] = 'Democrat'
else:
donor_df['Party'] = 'Republican'
donor_df is a dataframe want to create a new column named 'party' but its not giving an output 
donor_df是要创建一个名为“ party”的新列的数据donor_df但它没有给出输出
1 个解决方案
解决方案1
1 已采纳 2018-07-06 14:22:19
您正在寻找np.where
donor_df['Party']=np.where(donor_df['cand_nm'] == 'Obama, Barack','Democrat','Republican')
声明:本站的技术帖子网页，遵循CC BY-SA 4.0协议，如果您需要转载，请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.
相关问题
Pandas DataFrame：SettingWithCopyWarning：尝试在DataFrame的切片副本上设置值 - Pandas DataFrame: SettingWithCopyWarning: A value is trying to be set on a copy of a slice from a DataFrame
SettingWithCopyWarning：试图在来自 DataFrame 的切片副本上设置一个值警告 - SettingWithCopyWarning: A value is trying to be set on a copy of a slice from a DataFrame WARNING
对于循环错误，SettingWithCopyWarning：正在尝试在 DataFrame 中的切片副本上设置值 - For loop error, SettingWithCopyWarning: A value is trying to be set on a copy of a slice from a DataFrame
Python：SettingWithCopyWarning：尝试在DataFrame的切片副本上设置值 - Python: SettingWithCopyWarning: A value is trying to be set on a copy of a slice from a DataFrame
更改熊猫列中的值：SettingWithCopyWarning：正在尝试在数据帧错误中的切片副本上设置值 - Changing values in pandas columns: SettingWithCopyWarning: A value is trying to be set on a copy of a slice from a DataFrame error
循环导致错误：“SettingWithCopyWarning：试图在 DataFrame 的切片副本上设置值” - Loop led to Error: 'SettingWithCopyWarning: A value is trying to be set on a copy of a slice from a DataFrame'
SettingWithCopyWarning：试图在 DataFrame 中切片的副本上设置值。 尝试使用 .loc[row_indexer,col_indexer] = value 代替， - SettingWithCopyWarning: A value is trying to be set on a copy of a slice from a DataFrame. Try using .loc[row_indexer,col_indexer] = value instead,
试图在 DataFrame 中的切片副本上设置一个值 - A value is trying to be set on a copy of a slice from a DataFrame
正在尝试在DataFrame的切片副本上设置求解值 - Solving A value is trying to be set on a copy of a slice from a DataFrame
Python Pandas 警告：试图在 DataFrame 的切片副本上设置值 - Python Pandas Warning: A value is trying to be set on a copy of a slice from a DataFrame
相关标签