For Loop in Python to move through each file sequentially and append it into an array

I have a directory that has 72 folders, and within each folder are 245 numpy files. The directory is called MP_Data. I would like to read all the 245 numpy files within each folder in any order. However, the loop through the folders should be in numerical order.

The 72 folders are named as follows: (And I would like to keep it that way)

r0
r5
r10
r15
r20
r25
r30
r35
r40
r45
r50
r55
r60
r65
r70
r75
r80
r85
r90
r95
r100
r105
r110
r115
r120
r125
r130
r135
r140
r145
r150
r155
r160
r165
r170
r175
r180
r185
r190
r195
r200
r205
r210
r215
r220
r225
r230
r235
r240
r245
r250
r255
r260
r265
r270
r275
r280
r285
r290
r295
r300
r305
r310
r315
r320
r325
r330
r335
r340
r345
r350
r355

Here is what I have tried so far, but doesnt seem to work

sequences, labels = [], []
directory_1= r'C:\Users\.....\angle-model\MP_DATA'
direc=[]

for root, subdirectories, filenames in (sorted(os.walk(directory_1))):
    subdirectories=natsorted(subdirectories)
    for dirs in subdirectories:
        direc.append(dirs)

direc=np.array(direc)
for directory in direc:
    directory_2=(os.path.join(directory_1, directory))
for action in actions:
    window = []
    for root, subdirectories, filenames in (sorted(os.walk(directory_2))):
        filenames = natsorted(filenames)
        for filename in filenames:
            res=np.load(os.path.join(directory_2, filename))
            window.append(res)
    sequences.append(window)
    labels.append(label_map[action])

The above code is stuck within the same folder and doesnt move to the next folder. If I take a print of filenames, its repetitive.

['72.npy', '144.npy', '216.npy', '288.npy', '360.npy', '432.npy', '504.npy', '576.npy', '648.npy', '720.npy', '792.npy', '864.npy', '936.npy', '1008.npy', '1080.npy', '1152.npy', '1224.npy', '1296.npy', '1368.npy', '1440.npy', '1512.npy', '1584.npy', '1656.npy', '1728.npy', '1800.npy', '1872.npy', '1944.npy', '2016.npy', '2088.npy', '2160.npy', '2232.npy', '2304.npy', '2376.npy', '2448.npy', '2520.npy', '2592.npy', '2664.npy', '2736.npy', '2808.npy', '2880.npy', '2952.npy', '3024.npy', '3096.npy', '3168.npy', '3240.npy', '3312.npy', '3384.npy', '3456.npy', '3528.npy', '3600.npy', '3672.npy', '3744.npy', '3816.npy', '3888.npy', '3960.npy', '4032.npy', '4104.npy', '4176.npy', '4248.npy', '4320.npy', '4392.npy', '4464.npy', '4536.npy', '4608.npy', '4680.npy', '4752.npy', '4824.npy', '4896.npy', '4968.npy', '5040.npy', '5112.npy', '5184.npy', '5256.npy', '5328.npy', '5400.npy', '5472.npy', '5544.npy', '5616.npy', '5688.npy', '5760.npy', '5832.npy', '5904.npy', '5976.npy', '6048.npy', '6120.npy', '6192.npy', '6264.npy', '6336.npy', '6408.npy', '6480.npy', '6552.npy', '6624.npy', '6696.npy', '6768.npy', '6840.npy', '6912.npy', '6984.npy', '7056.npy', '7128.npy', '7200.npy', '7272.npy', '7344.npy', '7416.npy', '7488.npy', '7560.npy', '7632.npy', '7704.npy', '7776.npy', '7848.npy', '7920.npy', '7992.npy', '8064.npy', '8136.npy', '8208.npy', '8280.npy', '8352.npy', '8424.npy', '8496.npy', '8568.npy', '8640.npy', '8712.npy', '8784.npy', '8856.npy', '8928.npy', '9000.npy', '9072.npy', '9144.npy', '9216.npy', '9288.npy', '9360.npy', '9432.npy', '9504.npy', '9576.npy', '9648.npy', '9720.npy', '9792.npy', '9864.npy', '9936.npy', '10008.npy', '10080.npy', '10152.npy', '10224.npy', '10296.npy', '10368.npy', '10440.npy', '10512.npy', '10584.npy', '10656.npy', '10728.npy', '10800.npy', '10872.npy', '10944.npy', '11016.npy', '11088.npy', '11160.npy', '11232.npy', '11304.npy', '11376.npy', '11448.npy', '11520.npy', '11592.npy', '11664.npy', '11736.npy', '11808.npy', '11880.npy', '11952.npy', '12024.npy', '12096.npy', '12168.npy', '12240.npy', '12312.npy', '12384.npy', '12456.npy', '12528.npy', '12600.npy', '12672.npy', '12744.npy', '12816.npy', '12888.npy', '12960.npy', '13032.npy', '13104.npy', '13176.npy', '13248.npy', '13320.npy', '13392.npy', '13464.npy', '13536.npy', '13608.npy', '13680.npy', '13752.npy', '13824.npy', '13896.npy', '13968.npy', '14040.npy', '14112.npy', '14184.npy', '14256.npy', '14328.npy', '14400.npy', '14472.npy', '14544.npy', '14616.npy', '14688.npy', '14760.npy', '14832.npy', '14904.npy', '14976.npy', '15048.npy', '15120.npy', '15192.npy', '15264.npy', '15336.npy', '15408.npy', '15480.npy', '15552.npy', '15624.npy', '15696.npy', '15768.npy', '15840.npy', '15912.npy', '15984.npy', '16056.npy', '16128.npy', '16200.npy', '16272.npy', '16344.npy', '16416.npy', '16488.npy', '16560.npy', '16632.npy', '16704.npy', '16776.npy', '16848.npy', '16920.npy', '16992.npy', '17064.npy', '17136.npy', '17208.npy', '17280.npy', '17352.npy', '17424.npy', '17496.npy', '17568.npy']
.
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['72.npy', '144.npy', '216.npy', '288.npy', '360.npy', '432.npy', '504.npy', '576.npy', '648.npy', '720.npy', '792.npy', '864.npy', '936.npy', '1008.npy', '1080.npy', '1152.npy', '1224.npy', '1296.npy', '1368.npy', '1440.npy', '1512.npy', '1584.npy', '1656.npy', '1728.npy', '1800.npy', '1872.npy', '1944.npy', '2016.npy', '2088.npy', '2160.npy', '2232.npy', '2304.npy', '2376.npy', '2448.npy', '2520.npy', '2592.npy', '2664.npy', '2736.npy', '2808.npy', '2880.npy', '2952.npy', '3024.npy', '3096.npy', '3168.npy', '3240.npy', '3312.npy', '3384.npy', '3456.npy', '3528.npy', '3600.npy', '3672.npy', '3744.npy', '3816.npy', '3888.npy', '3960.npy', '4032.npy', '4104.npy', '4176.npy', '4248.npy', '4320.npy', '4392.npy', '4464.npy', '4536.npy', '4608.npy', '4680.npy', '4752.npy', '4824.npy', '4896.npy', '4968.npy', '5040.npy', '5112.npy', '5184.npy', '5256.npy', '5328.npy', '5400.npy', '5472.npy', '5544.npy', '5616.npy', '5688.npy', '5760.npy', '5832.npy', '5904.npy', '5976.npy', '6048.npy', '6120.npy', '6192.npy', '6264.npy', '6336.npy', '6408.npy', '6480.npy', '6552.npy', '6624.npy', '6696.npy', '6768.npy', '6840.npy', '6912.npy', '6984.npy', '7056.npy', '7128.npy', '7200.npy', '7272.npy', '7344.npy', '7416.npy', '7488.npy', '7560.npy', '7632.npy', '7704.npy', '7776.npy', '7848.npy', '7920.npy', '7992.npy', '8064.npy', '8136.npy', '8208.npy', '8280.npy', '8352.npy', '8424.npy', '8496.npy', '8568.npy', '8640.npy', '8712.npy', '8784.npy', '8856.npy', '8928.npy', '9000.npy', '9072.npy', '9144.npy', '9216.npy', '9288.npy', '9360.npy', '9432.npy', '9504.npy', '9576.npy', '9648.npy', '9720.npy', '9792.npy', '9864.npy', '9936.npy', '10008.npy', '10080.npy', '10152.npy', '10224.npy', '10296.npy', '10368.npy', '10440.npy', '10512.npy', '10584.npy', '10656.npy', '10728.npy', '10800.npy', '10872.npy', '10944.npy', '11016.npy', '11088.npy', '11160.npy', '11232.npy', '11304.npy', '11376.npy', '11448.npy', '11520.npy', '11592.npy', '11664.npy', '11736.npy', '11808.npy', '11880.npy', '11952.npy', '12024.npy', '12096.npy', '12168.npy', '12240.npy', '12312.npy', '12384.npy', '12456.npy', '12528.npy', '12600.npy', '12672.npy', '12744.npy', '12816.npy', '12888.npy', '12960.npy', '13032.npy', '13104.npy', '13176.npy', '13248.npy', '13320.npy', '13392.npy', '13464.npy', '13536.npy', '13608.npy', '13680.npy', '13752.npy', '13824.npy', '13896.npy', '13968.npy', '14040.npy', '14112.npy', '14184.npy', '14256.npy', '14328.npy', '14400.npy', '14472.npy', '14544.npy', '14616.npy', '14688.npy', '14760.npy', '14832.npy', '14904.npy', '14976.npy', '15048.npy', '15120.npy', '15192.npy', '15264.npy', '15336.npy', '15408.npy', '15480.npy', '15552.npy', '15624.npy', '15696.npy', '15768.npy', '15840.npy', '15912.npy', '15984.npy', '16056.npy', '16128.npy', '16200.npy', '16272.npy', '16344.npy', '16416.npy', '16488.npy', '16560.npy', '16632.npy', '16704.npy', '16776.npy', '16848.npy', '16920.npy', '16992.npy', '17064.npy', '17136.npy', '17208.npy', '17280.npy', '17352.npy', '17424.npy', '17496.npy', '17568.npy']

>Solution :

Your code could simplify (aside from actions, which you don’t show us) to something like

import os
from collections import defaultdict

root = "/tmp/mp_data"

# Map labels (subdirectories of root) to data
data_per_label = defaultdict(list)

# Get all top-level directories within `root`
label_dirs = [
    name for name in os.listdir(root) if os.path.isdir(os.path.join(root, name))
]
print(f"{label_dirs=}")

# Loop over each label directory
for label in label_dirs:
    label_dir = os.path.join(root, label)
    # Loop over each filename in the label directory
    for filename in os.listdir(label_dir):
        # Take care to only look at .npy files
        if filename.endswith(".npy"):
            filepath = os.path.join(label_dir, filename)
            print(f"{label=} {filename=} {filepath=}")
            data = filename  # replace with np.load(filename)
            data_per_label[label].append(data)

print(data_per_label)

Given a tree like

/tmp/mp_data
├── r1
│   └── a.npy
├── r2
│   └── b.npy
└── r3
    └── c.npy

this prints out

label_dirs=['r1', 'r3', 'r2']
label='r1' filename='a.npy' filepath='/tmp/mp_data/r1/a.npy'
label='r3' filename='c.npy' filepath='/tmp/mp_data/r3/c.npy'
label='r2' filename='b.npy' filepath='/tmp/mp_data/r2/b.npy'
defaultdict(<class 'list'>, {'r1': ['/tmp/mp_data/r1/a.npy'], 'r3': ['/tmp/mp_data/r3/c.npy'], 'r2': ['/tmp/mp_data/r2/b.npy']})