Quick 'n' dirty script to include as part of a custom cache node, or a shelf tool to calculate cache times for frame sequences (Python 3)

first_last_filetime.py

import math
import os
import re


def timedelta(file1, file2):
    t1 = os.path.getmtime(file1)
    t2 = os.path.getmtime(file2)
    time = abs(t2 - t1) / 60.0
    min = math.floor(time)
    sec = round((time - min) * 60.0)
    return f"{min}m {sec}s"
    
    
def wedge_files(searchdir, prefix, wedgenum):
    basename = f"{prefix}_{wedgenum}"
    files = []
    for file_ in os.listdir(searchdir):
        if re.match(basename, file_):
            files.append(os.path.join(searchdir, file_))
    if len(files) < 2:
        return
    return files


def find_wedge_numbers(searchdir, prefix):
    wedges = [re.match(rf"{prefix}(\d+)", x).group(1) for x in os.listdir(searchdir)]
    wedges = list(set([x for x in wedges if x]))
    return wedges
    
    
def report(cachedir, prefix):
    report = ""

    # Find all the different groups of files per match
    for wnum in find_wedge_numbers(cachedir, prefix):
        files = wedge_files(cachedir, "wedge", wnum)
        if files:
            report += f"Wedge {wnum}: {timedelta(files[0], files[-1])}\n"
    return report

# r = report("C:/Users/James/Projects/dev/houdini/geo/cachedev/geo1/particles/001", "wedge")
# print(r)

Assuming a path convention of something like

/path/to/cache/dir/wedge_0.$F.bgeo.sc
/path/to/cache/dir/wedge_1.$F.bgeo.sc
/path/to/cache/dir/wedge_2.$F.bgeo.sc
...

where wedge_ is the {prefix}