The code is not open source. However, If you inspect the network traffic from Chrome developer tools you can verify there are 0 post events occurring.
True, you can do this with many languages like python (quite easily with pandas as you pointed out) or with awk, perl, even cat (minus ordering) etc. For more power users Excel Power Query is your friend, but as you know these require script setup and memory considerations.
This tool is geared for ease of use anyone can do without the fuss of custom scripts and/or setups and for the most part almost zero memory concerns as the output is being written on the fly.
Re:Show HN: CSV file merging
by 11235813213455 on Tuesday December 17, 2019 @10:48AM
(#21814659)
your snippet just concatenates the content of 2 CSVs (while adjusting headers)?
Here's how it's done in JS: https://repl.it/@caub/csv-merge
I like glob for getting the list of files:
import glob
list_of_files = glob.glob("*.csv")
from pathlib import Path
dir = Path(".").glob('*.csv')
Re:Show HN: CSV file merging
by dr_kiszonka on Tuesday December 17, 2019 @01:38PM
(#21816976)
Glob is great but on some OS (Linux maybe?) it doesn't guarantee maintaining the order of files. If order matters, it would make sense to sort the results prior to processing.
Re:Show HN: CSV file merging
by lapnitnelav on Tuesday December 17, 2019 @07:23AM
(#21812780)
Obligatory plug for csvkit which allows you to do that and much more without having to write any code > https://csvkit.readthedocs.io/en/latest/
(You can also recreate this functionality locally with a few lines of Python):
import pandas as pd
import os
list_of_files = [f for f in os.listdir('.') if os.path.isfile(f) and ".csv" in f]
print(f"Files that will be concatenated are: {list_of_files}")
original_df = pd.DataFrame()
for file in list_of_files:
original_df.to_csv(f"Output file.csv", index=False)