Given a dictionary d: d # {‘A’: 1, ‘B’: 2, ‘C’: 3, ‘D’: 4} You can use a tuple to unpack the key-value pairs in the for loop header. for i, (k, v) in enumerate(d.items()): print(i, k, v) # 0 A 1 # 1 B 2 # 2 C 3 # 3 D 4 To … Read more
Ignacio’s answer is correct, but might fail if you have a 32 bit process. But maybe it could be useful to read the file block-wise and then count the \n characters in each block. def blocks(files, size=65536): while True: b = files.read(size) if not b: break yield b with open(“file”, “r”) as f: print sum(bl.count(“\n”) … Read more
Iterations in Kotlin: Some Alternatives Like already said, forEachIndexed is a good way to iterate. Alternative 1 The extension function withIndex, defined for Iterable types, can be used in for-each: val ints = arrayListOf(1, 2, 3, 4, 5) for ((i, e) in ints.withIndex()) { println(“$i: $e”) } Alternative 2 The extension property indices is available … Read more
I would use enumerate as it’s more generic – eg it will work on iterables and sequences, and the overhead for just returning a reference to an object isn’t that big a deal – while xrange(len(something)) although (to me) more easily readable as your intent – will break on objects with no support for len…
On top of the already provided answers there is a very nice pattern in Python that allows you to enumerate both keys and values of a dictionary. The normal case you enumerate the keys of the dictionary: example_dict = {1:’a’, 2:’b’, 3:’c’, 4:’d’} for i, k in enumerate(example_dict): print(i, k) Which outputs: 0 1 1 … Read more
You can use the zipWithIndex from Iterable trait: for ((line, i) <- Source.fromFile(args(0)).getLines().zipWithIndex) { println(i, line) }
for i, (letter, word) in enumerate(seq_nested): print i, letter, word
This is a neat way to do it: letters = [(‘a’, ‘A’), (‘b’, ‘B’)] for i, (lowercase, uppercase) in enumerate(letters): print “Letter #%d is %s/%s” % (i, lowercase, uppercase)
You’re on the right track. You’re using tqdm correctly, but stop short of printing each line inside the loop when using tqdm. You’ll also want to use tqdm on your first for loop and not on others, like so: with open(file_path, ‘r’) as f: for i, line in enumerate(tqdm(f)): if i >= start and i … Read more
How can I limit iterations of a loop in Python? for index, item in enumerate(items): print(item) if index == limit: break Is there a shorter, idiomatic way to write the above? How? Including the index zip stops on the shortest iterable of its arguments. (In contrast with the behavior of zip_longest, which uses the longest … Read more