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BUG: df.to_markdown() with empty frame incorrect output

See original GitHub issue

Code Sample, a copy-pastable example if possible

import pandas as pd

df = pd.DataFrame({'id': [], 'first_name': [], 'last_name': []}).set_index('id')
print(df.to_markdown())

| id   | first_name   | last_name   |
||

Problem description

The markdown output of empty DataFrames does not seem right to me (see Expected Output).

Expected Output

| id   | first_name   | last_name   |
|-----:|-------------:|------------:|

Render difference

Current

| id | first_name | last_name | ||

Expected

id	first_name	last_name

Output of `pd.show_versions()`

INSTALLED VERSIONS

commit : None python : 3.7.4.final.0 python-bits : 64 OS : Windows OS-release : 10 machine : AMD64 processor : Intel64 Family 6 Model 85 Stepping 4, GenuineIntel byteorder : little LC_ALL : None LANG : None LOCALE : None.None

pandas : 1.0.1 numpy : 1.18.1 pytz : 2019.3 dateutil : 2.8.0 pip : 19.2.3 setuptools : 41.4.0 Cython : 0.29.13 pytest : 5.2.1 hypothesis : None sphinx : 2.2.0 blosc : None feather : None xlsxwriter : 1.2.1 lxml.etree : 4.4.1 html5lib : 1.0.1 pymysql : None psycopg2 : 2.8.4 (dt dec pq3 ext lo64) jinja2 : 2.10.3 IPython : 7.8.0 pandas_datareader: None bs4 : 4.8.0 bottleneck : 1.2.1 fastparquet : None gcsfs : None lxml.etree : 4.4.1 matplotlib : 3.1.1 numexpr : 2.7.0 odfpy : None openpyxl : 3.0.0 pandas_gbq : None pyarrow : None pytables : None pytest : 5.2.1 pyxlsb : None s3fs : None scipy : 1.3.1 sqlalchemy : 1.3.12 tables : 3.5.2 tabulate : 0.8.6 xarray : None xlrd : 1.2.0 xlwt : 1.3.0 xlsxwriter : 1.2.1 numba : 0.45.1

Issue Analytics

State:
Created 4 years ago
Comments:9 (9 by maintainers)

Top GitHub Comments

1reaction

MarcoGorellicommented, Sep 2, 2020

@MarcoGorelli any chance this has resolved itself since Feb?

Yes, that seems to be the case!

In [1]: import pandas as pd 
   ...:  
   ...: df = pd.DataFrame({'id': [], 'first_name': [], 'last_name': []}).set_ind
   ...: ex('id') 
   ...: print(df.to_markdown())                                                 
| id   | first_name   | last_name   |
|------|--------------|-------------|

I’ll look into this to figure out when/how it was fixed

1reaction

alimcmaster1commented, Feb 7, 2020

I’ve asked @astanin

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