An iterable is an object, such as a string or collection, that can be iterated over, yielding up its members one at a time.
Questions tagged [iterable]
1303 questions
100
votes
4 answers
Why do I get "TypeError: 'int' object is not iterable" when trying to sum digits of a number?
Here's my code:
import math
print("Hey, lets solve Task 4 :)")
number1 = input("How many digits do you want to look at? ")
number2 = input("What would you like the digits to add up to? ")
if number1 == 1:
cow = range(0,10)
elif number1 == 2:
…
user2908001
99
votes
8 answers
How can I count the number of items in an arbitrary iterable (such as a generator)?
Suppose I have an arbitrary iterable - for example, a generator that iterates over lines of a file and yields the ones matching a regex.
How can I count the number of items in that iterable, supposing that I don't care about the elements themselves?
Fred Foo
- 355,277
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96
votes
16 answers
Using Objects in For Of Loops
Why isn't is possible to use objects in for of loops? Or is this a browser bug? This code doesn't work in Chrome 42, saying undefined is not a function:
test = { first: "one"}
for(var item of test) {
console.log(item)
}
Daniel Herr
- 19,083
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86
votes
4 answers
Why does Java not allow foreach on iterators (only on iterables)?
Possible Duplicate:
Why is Java's Iterator not an Iterable?
Idiomatic way to use for-each loop given an iterator?
Can we use for-each loop for iterating the objects of Iterator type?
The foreach loop are as far as I know syntax sugar added in Java…
Has QUIT--Anony-Mousse
- 76,138
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81
votes
4 answers
Opposite of any() function
The Python built-in function any(iterable) can help to quickly check if any bool(element) is True in a iterable type.
>>> l = [None, False, 0]
>>> any(l)
False
>>> l = [None, 1, 0]
>>> any(l)
True
But is there an elegant way or function in Python…
Ekeyme Mo
- 1,247
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78
votes
7 answers
Shortest way to get first item of `OrderedDict` in Python 3
What's the shortest way to get first item of OrderedDict in Python 3?
My best:
list(ordered_dict.items())[0]
Quite long and ugly.
I can think of:
next(iter(ordered_dict.items())) # Fixed, thanks Ashwini
But it's not very self-describing.…
Ram Rachum
- 84,019
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- 374
72
votes
3 answers
Unittest's assertEqual and iterables - only check the contents
Is there a 'decent' way in unittest to check the equality of the contents of two iterable objects?
I am using a lot of tuples, lists and numpy arrays and I usually only want to test for the contents and not for the type. Currently I am simply…
Lucas Hoepner
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69
votes
6 answers
Why aren't Enumerations Iterable?
In Java 5 and above you have the foreach loop, which works magically on anything that implements Iterable:
for (Object o : list) {
doStuff(o);
}
However, Enumerable still does not implement Iterable, meaning that to iterate over an Enumeration…
SCdF
- 57,260
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68
votes
1 answer
collections.Iterable vs typing.Iterable in type annotation and checking for Iterable
I found that in Python both collections.Iterable and typing.Iterable can be used in type annotation and checking for whether an object is iterable, i.e., both isinstance(obj, collections.Iterable) and isinstance(obj, typing.Iterable) works. My…
Benjamin Du
- 1,391
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66
votes
5 answers
Collection to Iterable
How can I get a java.lang.Iterable from a collection like a Set or a List?
Thanks!
myborobudur
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63
votes
4 answers
Does Rust have an equivalent to Python's list comprehension syntax?
Python list comprehension is really simple:
>>> l = [x for x in range(1, 10) if x % 2 == 0]
>>> [2, 4, 6, 8]
Does Rust have an equivalent syntax like:
let vector = vec![x for x in (1..10) if x % 2 == 0]
// [2, 4, 6, 8]
Darkaird
- 2,700
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59
votes
1 answer
How come regex match objects aren't iterable even though they implement __getitem__?
As you may know, implementing a __getitem__ method makes a class iterable:
class IterableDemo:
def __getitem__(self, index):
if index > 3:
raise IndexError
return index
demo = IterableDemo()
print(demo[2]) #…
Aran-Fey
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58
votes
8 answers
Why doesn't the String class in Java implement Iterable?
Many Java framework classes implement Iterable, however String does not. It makes sense to iterate over characters in a String, just as one can iterate over items in a regular array.
Is there a reason why String does not implement Iterable?
user333335
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57
votes
6 answers
Check if all values of iterable are zero
Is there a good, succinct/built-in way to see if all the values in an iterable are zeros? Right now I am using all() with a little list comprehension, but (to me) it seems like there should be a more expressive method. I'd view this as somewhat…
mjschultz
- 1,936
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55
votes
2 answers
Chart of IEnumerable LINQ equivalents in Scala?
Possible Duplicate:
LINQ analogues in Scala
I am looking for chart which shows equivalents in Scala of LINQ methods for IEnumerable:
First is head
Select is map
SingleOrDefault is ... (I don't know)
... and so on
Does anyone know anything of…
greenoldman
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