Sayth Renshaw <[email protected]> writes:
> This I did however I also get a list of None. I don't understand where
> none comes from. Can you please clarify?
Every function in Python, if it returns, returns a value.
In an expression that consists of only a function call, the expression
resolves to the return value from calling that function.
The ‘print’ function's return value is always None.
> a = (print("Got {0}".format(num[0])) for num in enumerate(range(10)))
> b = list(a)
> print(b)
Try this:
a = (None for num in enumerate(range(10)))
b = list(a)
print(b)
print(repr(b))
Now try this:
def always_return_none(dummy):
return None
a = (always_return_none("Got {0}".format(num[0])) for num in
enumerate(range(10)))
b = list(a)
print(b)
print(repr(b))
Now try this:
c = print("Foo")
print(c)
print(repr(c))
Does that help?
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\ “I knew it was a shocking thing to say, but … no-one has the |
`\ right to spend their life without being offended.” —Philip |
_o__) Pullman, 2010-03-28 |
Ben Finney
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