How can you use Python for Excel files? This webinar demonstrates the different packages and show how you can use them for unit tests and other tasks like User Defined Functions.

1. Python for Excel
Felix Zumstein, 14 July 2020
Tech3Camp #66

2. Agenda
1. Introduction
2. Spreadsheets in the age of blockchain
and AI
3. Python for Excel
4. Demo
2

3. 1. Introduction

4. Provide innovative
solutions for Excel
developers
4
Our Mission

5. xlwings
• Python for Excel
• Scripts, UDFs,
Macros, REST API
• Windows & Mac
• CE: Free & open-source, part of Anaconda
• PRO: e.g. embedding Python code
5

6. xltrail
• Version control
with or without Git
• Audit Trail for
Excel
• Currently tracks:
– Formulas
– VBA code
– Power queries
– Named ranges
6

7. 2. Spreadsheets in the age
of blockchain and AI COVID-19

8. COVID-19
8
https://www.who.int/publications/m/item/covid-19-essential-supplies-forecasting-tool

9. Look familiar? Part I
9

10. =IFERROR(@IF($F1="yes",MMULT(--
(J23:N23>0),--('HCW &
Staff'!$BH$22:$BH$26))*$C$113,MMULT(--
(J23:N23),--('HCW &
Staff'!$BF$22:$BF$26))*$C$114),0)+IF('
Equipment List &
Usage'!$F1="yes",$C$113,$C$114)*Total_
Inpatients_in_beds_over_time*Q23
Look familiar? Part II
10
https://www.who.int/publications/m/item/covid-19-essential-supplies-forecasting-tool

11. The London Whale
Source: https://www.bloomberg.com/quicktake/the-london-whale (2/23/2016) 11

12. Our interpretation
1) Excel = code, so treat it as such!
2) Migrating away from Excel is not
always feasible.
12

13. 3. Python for Excel

14. Two types of Packages
14
Reader/Writer
• OpenPyXL
• XlsxWriter
• xlwt/xlrd
• pyxlsb (read-only,
no option to write
xlsb files)
Automation
• xlwings
• PyXXL
(commercial-only)

15. 4. Demo

16. Demo
16
1. Interactive use with Jupyter notebook
2. Static unit tests using OpenPyXL
3. Dynamic unit tests using xlwings
4.UDF: Correlation matrix
5. Macro: Monte Carlo simulation
6.Reporting (PRO feature)

17. Resources
17
1. https://github.com/xlwings/xlwings-demo
2. https://github.com/xlwings/static-excel-test
3. https://gitlab.com/xlwings/xlwings-workflow

18. Thank You
Let’s connect:
https://www.linkedin.com/in/felix-zumstein