如何基于列值扩展数据框？

import pandas as pd
import numpy as np

# reconstruct part of your DataFrame for testing purposes:
df = pd.DataFrame([[17.35, 57.44], [17.29, 57.47], [17.22, 57.51]], 
                 columns = ['elevation_deg', 'lat_e_deg'])

# create a Series of the desired stepwise values:
lat_e_deg_expanded = pd.Series(np.arange(start = min(df['lat_e_deg']), 
                                         stop = max(df['lat_e_deg']), 
                                         step = 0.01), 
                               name = 'lat_e_deg')

# merge the expanded series with the original DataFrame and sort:
df_expanded = pd.merge(df, lat_e_deg_expanded, 
                       on = 'lat_e_deg', 
                       how = 'outer')
df_expanded.sort_values(by = 'lat_e_deg', inplace = True)

回答来源：stackoverflow