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42 lines
1022 B
Markdown
42 lines
1022 B
Markdown
Codon supports generators, and in fact they are heavily optimized in
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the compiler so as to typically eliminate any overhead:
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``` python
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def gen(i):
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while i < 10:
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yield i ** 2
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i += 1
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print(list(gen(10))) # prints [0, 1, 4, ..., 81]
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print(list(gen(0))) # prints []
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```
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You can also use `yield` to implement coroutines: `yield` suspends the
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function, while `(yield)` (i.e. with parenthesis) receives a value, as
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in Python.
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``` python
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def mysum(start):
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m = start
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while True:
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a = (yield) # receives the input of coroutine.send() call
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if a == -1:
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break # exits the coroutine
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m += a
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yield m
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iadder = mysum(0) # assign a coroutine
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next(iadder) # activate it
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for i in range(10):
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iadder.send(i) # send a value to coroutine
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print(iadder.send(-1)) # prints 45
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```
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Generator expressions are also supported:
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``` python
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squares = (i ** 2 for i in range(10))
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for i,s in enumerate(squares):
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print(i, 'x', i, '=', s)
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```
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