这是一个例子：
from openpyxl import load_workbook
wb = load_workbook(filename='data.xlsx',
read_only=True)
ws = wb['Sheet2']
# Read the cell values into a list of lists
data_rows = []
for row in ws['A3':'D20']:
data_cols = []
for cell in row:
data_cols.append(cell.value)
data_rows.append(data_cols)
# Transform into dataframe
import pandas as pd
df = pd.DataFrame(data_rows)
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