python - Pandas 石斑鱼显示类型错误

Question

我使用 Pandas Groupby 对数据进行分组，但得到了

TypeError: sequence item 0: expected str instance, float found

我的代码:

df.groupby(pd.Grouper(key='Date',freq='W-Sun')).apply(lambda x: " ".join(x['Text']))

然后我用了:

df = df.applymap(str)

但是得到了

TypeError: Only valid with DatetimeIndex, TimedeltaIndex or PeriodIndex, but got an instance of 'Index'

Answer 1

用途:

#if need convert values to strings
df.groupby(pd.Grouper(key='Date',freq='W-Sun'))['Text'].apply(lambda x: " ".join(x.astype(str)))

<小时/>

#if need remove NaNs and Nones values in Text column
df.groupby(pd.Grouper(key='Date',freq='W-Sun'))['Text'].apply(lambda x: " ".join(x.dropna()))

<小时/>

#if need remove NaNs and Nones values in Text column and cast to str
df.groupby(pd.Grouper(key='Date',freq='W-Sun'))['Text'].apply(lambda x: " ".join(x.astype(str).dropna()))