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wait_for_file.py

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import os.path

import sys

import time

try:

_, filename = sys.argv

except ValueError:

_, filename, outfile = sys.argv

sys.stdout = open(outfile, 'w')

print('waiting for file {!r}'.format(filename))

# We use sys.stdout.write() instead of print() because Python 2...

if not os.path.exists(filename):

time.sleep(0.1)

sys.stdout.write('.')

sys.stdout.flush()

i = 1

while not os.path.exists(filename):

time.sleep(0.1)

if i % 10 == 0:

sys.stdout.write(' ')

if i % 600 == 0:

if i == 600:

sys.stdout.write('\n = 1 minute =\n')

else:

sys.stdout.write('\n = {} minutes =\n'.format(i // 600))

elif i % 100 == 0:

sys.stdout.write('\n')

sys.stdout.write('.')

sys.stdout.flush()

i += 1

print('\nfound file {!r}'.format(filename))

print('done!')