57 lines
1.2 KiB
Python
57 lines
1.2 KiB
Python
# spinner_thread.py
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# credits: Adapted from Michele Simionato's
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# multiprocessing example in the python-list:
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# https://mail.python.org/pipermail/python-list/2009-February/538048.html
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# BEGIN SPINNER_THREAD
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import threading
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import itertools
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import time
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import sys
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class Signal: # <1>
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go = True
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def spin(msg, signal): # <2>
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write, flush = sys.stdout.write, sys.stdout.flush
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for char in itertools.cycle('|/-\\'): # <3>
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status = char + ' ' + msg
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write(status)
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flush()
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write('\x08' * len(status)) # <4>
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time.sleep(.1)
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if not signal.go: # <5>
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break
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write(' ' * len(status) + '\x08' * len(status)) # <6>
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def slow_function(): # <7>
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# pretend waiting a long time for I/O
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time.sleep(3) # <8>
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return 42
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def supervisor(): # <9>
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signal = Signal()
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spinner = threading.Thread(target=spin,
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args=('thinking!', signal))
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print('spinner object:', spinner) # <10>
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spinner.start() # <11>
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result = slow_function() # <12>
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signal.go = False # <13>
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spinner.join() # <14>
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return result
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def main():
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result = supervisor() # <15>
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print('Answer:', result)
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if __name__ == '__main__':
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main()
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# END SPINNER_THREAD
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