我正在尝试使用pandas从数据帧中选择数据类型为整数的三列[“attacktype1”,“attacktype2”,“attacktype3”],并希望将na(0)填充到这些列中,然后将这些列合计到一个新列中。[“total\ u attacks”]
数据集可从以下位置下载: 单击[此处]https://s3.amazonaws.com/datasetsgun/data/terror.csv
我曾经尝试过一次将fillna(0)应用于一列,然后将它们合计到一个新的单列中。你知道吗
我的第一条路:
da1 = pd.read_csv('terror.csv', sep = ',', header=0 , encoding='latin' , na_values=['Missing', ' '])
da1.head()
#Handling missing values
da1['attacktype3'] = da1['attacktype3'].fillna(0)
da1['attacktype2'] = da1['attacktype2'].fillna(0)
da1['attacktype1'] = da1['attacktype1'].fillna(0)
da1['total_attacks'] = da1['attacktype3'] + da1['attacktype2'] + da1['attacktype1']
#country_txt is a column which consists of different countries.Want to find "Total_atacks" only for India. Therefore, the condition applied is country_txt=='India'.
a1 = da1.query("country_txt=='India'").agg({'total_attacks':np.sum})
print(a1)
我的第二种方法(不起作用):
da1 = pd.read_csv('terror.csv', sep = ',', header=0 , encoding='latin' , na_values=['Missing', ' '])
da1.head()
#Handling missing values
check1=Df.country_txt=="India"
store=Df[["attacktype1","attacktype2","attacktype3"]].apply(lambda x:x.fillna(0))
Total_attack=Df.loc[check1,store].sum(axis=1)
print(Total_attack)
I want to apply fillna(0) to multiple columns in a single line and also total those columns in an alternate and effective way.
The error that I get when I use my second way is:
ValueError: Cannot index with multidimensional key
首先用^{} 按^{} 筛选,然后用^{} 替换缺少的值:
对于标量,一个数字输出add
sum
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