pandas 如何将一行附加到另一个数据帧
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How to append a row to another dataframe
提问by Ironman10
I have dataframes df1and df2both with columns ["Ticker", "Adj.Factor", "Date"]. I want to add to df2the complete row from df1if the value of "Adj.Factor" in that row in df1equals to 0.
我有数据框，df1并且df2都带有 column ["Ticker", "Adj.Factor", "Date"]。我想添加到df2从完整的排df1在该行中“Adj.Factor”如果值df1等于0。
I have the following code.
我有以下代码。
for x in range(tot_len):
if df1.iloc[x]['Adj.Factor'] == 0:
df2.append(df1.iloc[x]) --> not working.
`
`
I have tried printing the values and it shows the correct output. But the values are not appended to df2.
我试过打印这些值，它显示了正确的输出。但是这些值没有附加到 df2。
回答by tarashypka
It seems you missed an assignment. Here is a simpler solution
看来你错过了一项任务。这是一个更简单的解决方案
df2 = df2.append(df1[df1['Adj.Factor'] == 0])
回答by Hamed
Try:
尝试：
df2 = df2.append(df1.iloc[x])
DataFrame.append(self, other, ignore_index=False, verify_integrity=False, sort=False) → 'DataFrameAppend rows of otherto the end of caller, returning a new object.
DataFrame.append(self, other, ignore_index=False, verify_integrity=False, sort=False) → 'DataFrame将other 的行附加到caller的末尾，返回一个新对象。
