type of result of iter()

[Gribouillis]

Could run it trough next(),and catch the in error in try:except.

The drawback is that next() consumes the first item of the iterator. So it won't work if you want to check if it is an iterator and then traverse the iterator.

[snippsat]

The drawback is that next() consumes the first item of the iterator. So it won't work if you want to check if it is an iterator and then traverse the iterator.

Ahh of course that would be a drawback thanks for info.

[Skaperen]

sometime LBYL gives you more detail about what is wrong. the could be of value in detailed error messages or when applying a correction such as substituting an empty list.

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unless, of course, your can save what you got from next() when there is no exception.