On Sun, 31 Mar 2013 21:45:21 -0700, iMath wrote:
> executor.map() TypeError: zip argument #2 must support iteration
>
> when I run it ,just generated TypeError: zip argument #2 must support
> iteration. can anyone help me fix this problem ?
Yes. Read the error message, and inspect the line that is in error. You
have:
> future_to_url = executor.map(str,lst100, 60)
executor.map has three arguments:
Arg 0: str
Arg 1: list of 100 ints
Arg 2: int 60
Argument 2, the number 60, does not support iteration, since it is an int.
Now read the docs for map. At the interactive interpreter, do this:
py> from concurrent.futures import ThreadPoolExecutor
py> help(ThreadPoolExecutor.map)
and you will see the following documentation:
map(self, fn, *iterables, timeout=None)
Returns a iterator equivalent to map(fn, iter).
Args:
fn: A callable that will take take as many arguments as there are
passed iterables.
timeout: The maximum number of seconds to wait. If None, then
there is no limit on the wait time.
Notice that the iterables argument is prefixed with * symbol. That means
that it collects all the remaining positional arguments, which means that
the timeout argument is keyword only.
So try this:
future_to_url = executor.map(str, lst100, timeout=60)
--
Steven
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