Because Python generators don't do anything when you call the function. They only execute code when you call next (or send) on them (or when you do something that calls their next - like iterating on them with a for loop or making a list out of them)
In[1]:defsingle_io():...:print('starting the IO')...:yield...:print('processing the IO result')In[2]:coroutine=single_io()In[3]:# The coroutine did not actually start yet
In[4]:# It will only start here:
In[5]:next(coroutine)startingtheIOIn[6]:
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Within the last but one code snippet, I was wondering…
Why is there this call to
next(coroutine)in thefor io in iosloop?Because Python generators don't do anything when you call the function. They only execute code when you call
next(orsend) on them (or when you do something that calls theirnext- like iterating on them with aforloop or making alistout of them)