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我迭代通過數據幀,我試圖將值添加到特定的列的每一行,但是當我打印rulting數據幀中的值不存在更新數據幀由行但不更新
#add two new blank columns to the dayData dataframe
dayData["myValue1"]=""
dayData["myValue2"]=""
#iterate over the dataframe
for idxDay, row in dayData.iterrows():
do something.....
#interate again through the dataframe
for idxRange, row1 in dayData.iterrows():
do something else....
calculate value1
calculate value2
#write the result for value1 and value2 to the dayData dataframe
row["myValue1"]=value1
row["myValue2"]=value2
print(dayData)
值1和值2的值是正確的,即使當我硬編碼value1 = 1和value2 = 2時,我打印dayData myValue1和myValue2列後面的列應更新它們不包含數據。
產生的dayData數據框應該像
vwap last volume ratio myLong myShort
0 301.071871 301.221525 43133218.0 1.000497 1 2
1 215.545413 213.791400 349730738.0 0.991862 3 3
而是我只是得到:
vwap last volume ratio myLong myShort
0 301.071871 301.221525 43133218.0 1.000497
1 215.545413 213.791400 349730738.0 0.991862
如果有人可以幫助我們將不勝感激。
謝謝