cs107-lecture-examples

Example codes used during Harvard CS107 lectures
git clone https://git.0xfab.ch/cs107-lecture-examples.git
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coroutine.py (737B)

      1 #!/usr/bin/env python3
      2 # File       : coroutine.py
      3 # Description: Simple coroutine example
      4 # Copyright 2022 Harvard University. All Rights Reserved.
      5 from inspect import getgeneratorstate
      6 
      7 
      8 def coroutine():
      9     ncalls = 0
     10     while True:
     11         x = yield ncalls
     12         ncalls += 1
     13         print(f'coroutine(): {x} (call id: {ncalls})')
     14 
     15 
     16 def main():
     17     c = coroutine()
     18     print(getgeneratorstate(c))
     19     next(c)  # prime the coroutine; next() returns 0 here
     20     print(getgeneratorstate(c))
     21 
     22     c.send('CS107')
     23     print('main(): control back in main function')
     24     n_call = c.send('AC207')
     25     print(f'main(): called coroutine() {n_call} times')
     26 
     27     c.close()
     28     print(getgeneratorstate(c))
     29 
     30 
     31 if __name__ == "__main__":
     32     main()