我有59列,其名称的格式为:nn: xxxxxx (ttttttt)
,其中tttttt
是为某些特定列重复的名称。现在,我想计算tttttt='XXXXXX'
时非空单元格的总和。我知道如何计算列中非空单元格的数量,但是如何在列名中添加ttttt
为XXXXXX
的条件?
import pandas as pd
df = pd.read_csv("dane.csv", sep=';')
shape = list(df.shape)
nonempty=df.apply(lambda x: shape[0]-x.isnull().sum())
输入:
1: Brandenburg (Post-Panamax) 2: Acheron (Feeder) 5: Fenton (Feeder)
ES-NL-10633096/1938/X1@hkzydbezon.dk/6749 DE-JP-20438082/2066/A2@qwinfhcaer.cu/68849 NL-LK-02275406/2136/A1@ozmmfdpfts.de/73198
BE-BR-61613986/3551/B1@oqk.bf/39927 NL-LK-02275406/2136/A1@ozmmfdpfts.de/73198
PH-SA-39552610/2436/A1@venagi.hr/80578
PA-AE-59814691/4881/X1@zhicvzvksl.cl/25247 OM-PH-31303222/3671/Z1@jtqy.ml/52408
例如,对于此输入,假设我要计算“ Feeder”列中名称的非空单元格数量
答案 0 :(得分:2)
您可以使用filter
:
df.filter(like='(Feeder)').isna().sum()
或更精确的版本,要求(Feeder)
出现在列的末尾:
df.filter(regex='.*(\(Feeder\))$').isna().sum()
输出:
2: Acheron (Feeder) 1
5: Fenton (Feeder) 3
dtype: int64