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The files module provides utilities for working with the filesystem.

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join_files

Concatenates a set of numbered partial files into a single output file. The function scans the same directory as the output file for files whose name follows the pattern <stem>_*<suffix> and appends each one to the output file in glob order. 
from alexber.utils.files import join_files

# Given: output_part_1.txt, output_part_2.txt, output_part_3.txt
join_files('output.txt')
# Produces: output.txt  (contents of all three parts concatenated)
Typical use case — reassembling a file that was split across multiple worker processes: 
import pathlib
from alexber.utils.files import join_files

output_path = pathlib.Path('/data/results.csv')
join_files(output_path)
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f
str | Path
required
Path to the output file. This path is also used as the glob pattern base: all files in the same directory whose names match <stem>_*<suffix> are read and written into this file.
Returns: None. The output file is written (or overwritten) in place.
The output file is opened in write mode ('w'), which will overwrite any existing content. The partial files (<stem>_*<suffix>) are read but not deleted.