问题
I would like to perform two different calculations across consecutive columns in a pandas or pyspark dataframe.
Columns are weeks and the metrics are displayed as rows. I want to calculate the actual and percentage differences across the columns.
The input/output tables incl. the calculations used in Excel are displayed in the following image. I want to replicate these calculations on a pandas or pyspark dataframe.
Raw Data Attached:
Metrics Week20 Week21 Week22 Week23 Week24 Week25 Week26 Week27
Sales 20301 21132 20059 23062 19610 22734 22140 20699
TRXs 739 729 690 779 701 736 762 655
Attachment Rate 4.47 4.44 4.28 4.56 4.41 4.58 4.55 4.96
AOV 27.47 28.99 29.07 29.6 27.97 30.89 29.06 31.6
Profit 5177 5389 5115 5881 5001 5797 5646 5278
Profit per TRX 7.01 7.39 7.41 7.55 7.13 7.88 7.41 8.06
回答1:
in pandas you could use pct_change(axis=1) and diff(axis=1) methods:
df = df.set_index('Metrics')
# list of metrics with "actual diff"
actual = ['AOV', 'Attachment Rate']
rep = (df[~df.index.isin(actual)].pct_change(axis=1).round(2)*100).fillna(0).astype(str).add('%')
rep = pd.concat([rep,
df[df.index.isin(actual)].diff(axis=1).fillna(0)
])
In [131]: rep
Out[131]:
Week20 Week21 Week22 Week23 Week24 Week25 Week26 Week27
Metrics
Sales 0.0% 4.0% -5.0% 15.0% -15.0% 16.0% -3.0% -7.0%
TRXs 0.0% -1.0% -5.0% 13.0% -10.0% 5.0% 4.0% -14.0%
Profit 0.0% 4.0% -5.0% 15.0% -15.0% 16.0% -3.0% -7.0%
Profit per TRX 0.0% 5.0% 0.0% 2.0% -6.0% 11.0% -6.0% 9.0%
Attachment Rate 0 -0.03 -0.16 0.28 -0.15 0.17 -0.03 0.41
AOV 0 1.52 0.08 0.53 -1.63 2.92 -1.83 2.54
来源：https://stackoverflow.com/questions/38484042/actual-and-percentage-difference-on-consecutive-columns-in-a-pandas-or-pyspark-d