如何使用 python 将列添加到现有 excel 文件？

Question

这是我的代码：

import openpyxl, pprint
wb = openpyxl.load_workbook('/Users/sarahporgess/Desktop/SSA1.xlsx')
sheet = wb.get_sheet_by_name('Sheet1')


data = {}
for row in range(1,sheet.max_row+1):


        date = sheet['A' +str(row)].value
        gamma = sheet['B' +str(row)].value
        theta = sheet['C' +str(row)].value
        ratio = float(gamma)/float(theta)
        resultFile = open('SSA2.csv' , 'w')
        resultFile.write( pprint.pformat(date))
        resultFile.write( pprint.pformat(gamma))
        resultFile.write( pprint.pformat(theta))

        resultFile.write( pprint.pformat(ratio))
        print(ratio)
        sheet['D1']=ratio
resultFile.close()
print('Done.')

我现有的 excel 文件当前有三列："date, gamma, theta"。我想添加名为 "ratio" 的第四列，即 gamma/theta 的比率。如何使用 python 向现有 excel 文档添加另一列？此代码创建一个 excel 文档，其中 4 个元素打印在一个单元格中

Answer 1

根据您更新的问题，我重写了我的答案。

您不需要使用其他库来完成您正在尝试做的事情。这是完成您想要的任务的另一种选择。

import openpyxl
import pprint

wb = openpyxl.load_workbook('/Users/sarahporgess/Desktop/SSA1.xlsx')
sheet = wb.active
# you may also use the wb.get_sheet_by_name('Sheet1') method here.


data = {}
for row in range(1,sheet.max_row+1):
        date = sheet.cell(row = row, column = 1) # use .cell() to get values of cells
        gamma = sheet.cell(row = row, column = 2)
        theta = sheet.cell(row = row, column = 3)
        print(date, gamma, theta)
        ratio = float(gamma)/float(theta)
        new_wb = openpyxl.Workbook() # creates new workbook to be saved as results
        # you can also open a wookbook here instead but I wrote it to create a results workbook as I didnt already have one.
        new_sheet = new_wb.active
        new_sheet['A1'] = pprint.pformat(date)
        new_sheet['B1'] = pprint.pformat(gamma)
        new_sheet['C1'] = pprint.pformat(theta)
        new_sheet['D1'] = pprint.pformat(ratio)
        print(ratio)
        # save new workbook as SSA2
        new_wb.save('/Users/sarahporgess/Desktop/SSA2.xlsx')

print('Done.')

Answer 2

使用Pandas包更容易

import pandas as pd
file_name = #Path to your file
df = pd.read_excel(file_name) #Read Excel file as a DataFrame

df['Ratio'] = df['Gamma']/df['Theta']
#Display top 5 rows to check if everything looks good
df.head(5)

#To save it back as Excel
df.to_excel("path to save") #Write DateFrame back as Excel file

Answer 3

从您的代码中不清楚您是要打印结果还是编辑现有文件。如果您正在编辑 Excel 文件，那么您可能想要创建一个公式并让 Excel 为您计算。

import openpyxl
wb = openpyxl.load_workbook('/Users/sarahporgess/Desktop/SSA1.xlsx')
sheet = wb['Sheet1']

for row in sheet:
     date, gamma, theta = row
     ratio = theta.offset(column=1)
     ratio.value = "=B{0}/C{0}".format(theta.row) # if you want the formula
     # ratio.value = gamma/theta # if you just want the calculation

wb.save(…)

如何使用 python 将列添加到现有 excel 文件？

How do I add a column to an existing excel file using python?

python

excel

openpyxl