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Update iters.md

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`@@ -246,6 +246,25 @@ while True:`
`246`	`246`	`print(thing)`
`247`	`247`	```
`248`	`248`
	`249`	`+## Checking if object is iterable or not`
	`250`	`+`
	`251`	`+There is an easy way of checking if an object in python is iterable or not. The following code will do the needful.`
	`252`	+```python
	`253`	`+>>> def check(A):`
	`254`	`+... try:`
	`255`	`+... st = iter(A)`
	`256`	`+... print('yes')`
	`257`	`+... except TypeError:`
	`258`	`+... print('no')`
	`259`	`+...`
	`260`	`+>>> check(25)`
	`261`	`+no`
	`262`	`+>>> check([25,35])`
	`263`	`+yes`
	`264`	`+>>>`
	`265`	+```
	`266`	`+Here you can observe that the 25 is an integer, so it is not iterable, but [25,35] is a list which is iterable so it outputs no and yes respectively.`
	`267`	`+`
`249`	`268`	`## Generators`
`250`	`269`
`251`	`270`	`It's possible to create a custom iterator with a class that defines an`
@@ -442,7 +461,6 @@ does the same thing as our `count()`.
`442`	`461`	`generator runs it to the next yield and gives us the value it yielded.`
`443`	`462`	`- [The itertools module](https://docs.python.org/3/library/itertools.html)`
`444`	`463`	`contains many useful iterator-related things.`
`445`		`-`
`446`	`464`	`***`
`447`	`465`
`448`	`466`	`If you have trouble with this tutorial please [tell me about`

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