Resuming file uploads in flask

resume_upload.py

import hashlib
full_file = 'isd-inventory.csv'
part_file = 'isd-inventory.csv.part'

m = hashlib.md5()
with open(full_file, 'rb') as f:
    for chunk in iter(lambda: f.read(128*m.block_size), b''):
        m.update(chunk)

print(m.hexdigest())

m = hashlib.md5()
with open(part_file, 'rb') as f:
    for chunk in iter(lambda: f.read(128*m.block_size), b''):
        m.update(chunk)

print(m.hexdigest())

with open(full_file, 'rb') as f:
    print(f.tell())
    f.seek(0, 2)
    print(f.tell())

with open(part_file, 'rb') as f:
    print(f.tell())
    f.seek(0, 2)
    print(f.tell())

with open(full_file, 'rb') as f:
    f.seek(6619668, 0)
    copy = f.read()

with open(part_file, 'ab') as f:
    f.write(copy)
    f.seek(0)
m = hashlib.md5()
with open(part_file, 'rb') as f:
    for chunk in iter(lambda: f.read(128*m.block_size), b''):
        m.update(chunk)
print(m.hexdigest())
m = hashlib.md5()
with open(full_file, 'rb') as f:
    for chunk in iter(lambda: f.read(128*m.block_size), b''):
        m.update(chunk)
print(m.hexdigest())

m = hashlib.md5()
with open('hello.txt', 'rb') as f:
    for chunk in iter(lambda: f.read(128*m.block_size), b''):
        m.update(chunk)

print(m.hexdigest())
m = hashlib.md5()
with open('world.txt', 'rb') as f:
    for chunk in iter(lambda: f.read(128*m.block_size), b''):
        m.update(chunk)

print(m.hexdigest())
with open('hello.txt', 'ab') as f:
    f.seek(0,2)
    k = f.tell()
    with open('world.txt', 'rb') as fo:
        fo.seek(k, 0)
        c = fo.read()
    f.write(c)
    f.seek(0)
m = hashlib.md5()
with open('hello.txt', 'rb') as f:
    for chunk in iter(lambda: f.read(128*m.block_size), b''):
        m.update(chunk)

print(m.hexdigest())
m = hashlib.md5()
with open('world.txt', 'rb') as f:
    for chunk in iter(lambda: f.read(128*m.block_size), b''):
        m.update(chunk)

print(m.hexdigest())