我想在现有列中合并两列，每列都有一个值，具体取决于条件或引用
我尝试使用此功能：
your_prop现有列为“到达价格”，将填充“到达价格”信息的列为“最后中间价”和“到达价格（本地）”
wb['Arrival Price'] = wb['Arrival Price Price (local)'].map(str)+wb['Last Mid'].map(str)
输出为：
import os, openpyxl, glob, os.path
import pandas as pd
import numpy as np
import math
os.chdir(r'C:\Users\maria.huerfano\Documents\Python_Exercises\join_excel')
wb = pd.read_excel('Markit_EQ_FI_07242019_WEEKLY.xlsx',sheet_name='Sheet1', dtype=str)
eq = pd.read_excel('PRIIPS_EQ_LITE_20190325_20190719.xlsx',sheet_name='Sheet1', dtype=str)
fi = pd.read_excel('CSV_Output_Default_20190325_20190719.xlsx',sheet_name='Sheet1',dtype=str)
wb.insert(17, 'Arrival Price Price (local)', wb['SSB Internal Trade ID'].map(eq.set_index(['SSB Internal Trade ID'])['Arrival Price Price (local)'])) # the condition here is 'SSB Internal Trade ID'
wb.insert(18, 'Last Mid', wb['SSB Internal Trade ID'].map(fi.set_index(['OrderID'])['Last Mid']))# the condition here is 'OrderID' the meaning is the same as 'SSB Internal Trade ID'
wb['Arrival Price'] = wb['Arrival Price Price (local)'].map(str)+wb['Last Mid'].map(str)