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python Programming Glossary: iteratorsGetting a map() to return a list in python 3.1 http://stackoverflow.com/questions/1303347/getting-a-map-to-return-a-list-in-python-3-1 Python 3 many processes that iterate over iterables return iterators themselves. In most cases this ends up saving memory and should..
Why program functionally in Python? http://stackoverflow.com/questions/1892324/why-program-functionally-in-python guises closures generators and occasionally other kinds of iterators . itertools as a commenter pointed out does include imap and..
How does zip(*[iter(s)]*n) work in Python? http://stackoverflow.com/questions/2233204/how-does-zipitersn-work-in-python it's the same iter when zip calls next on each of the 3 iterators it really calls next on the same iterator thus forwarding the.. Ignacio and ujukatzel say you pass to zip three identical iterators and zip makes 3 tuples of the integers ”in order ”from each of.. 3 tuples of the integers ”in order ”from each of the three iterators 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 ^ ^ ..
The Python yield keyword explained http://stackoverflow.com/questions/231767/the-python-yield-keyword-explained when you have a lot of values. Generators Generators are iterators but you can only iterate over them once . It's because they.. implying iterables implementing the __iter__ method and iterators implementing the __next__ method . Iterables are any objects..
Merging/adding lists in Python http://stackoverflow.com/questions/263457/merging-adding-lists-in-python list Sort of like zip map but with more than two iterators. Example I have the following list array 1 2 3 4 5 6 7 8 9 I..
Setting smaller buffer size for sys.stdin? http://stackoverflow.com/questions/3670323/setting-smaller-buffer-size-for-sys-stdin buffering in xread lines readlines and file object iterators for line in sys.stdin which is not influenced by this option...
check if all elements in a list are identical http://stackoverflow.com/questions/3844801/check-if-all-elements-in-a-list-are-identical must be hashable. checkEqual1 and checkEqual2 can use any iterators but checkEqual3 must take a sequence input typically concrete..
How to write the Fibonacci Sequence in Python http://stackoverflow.com/questions/494594/how-to-write-the-fibonacci-sequence-in-python the sequence 0 1 1 2 3 5 8 etc. If your language supports iterators you may do something like def F a b 0 1 yield a yield b while..
Iterate a list as pair (current, next) in Python http://stackoverflow.com/questions/5434891/iterate-a-list-as-pair-current-next-in-python itertools.izip a b How this works First two parallel iterators a and b are created the tee call both pointing to the first.. iterator independently the izip function takes the two iterators and makes pairs of the returned elements advancing both iterators.. and makes pairs of the returned elements advancing both iterators at the same pace. One caveat the tee function produces two iterators..
What is the best way to implement nested dictionaries in Python? http://stackoverflow.com/questions/635483/what-is-the-best-way-to-implement-nested-dictionaries-in-python catch blocks. Moreover I have to create annoying nested iterators if I want to go over all the values. I could also use tuples..
How do I use Python's itertools.groupby()? http://stackoverflow.com/questions/773/how-do-i-use-pythons-itertools-groupby key. In other words the groupby iterator itself returns iterators. Here's an example of that using clearer variable names from..
Iterate an iterator by chunks (of n) in Python? http://stackoverflow.com/questions/8991506/iterate-an-iterator-by-chunks-of-n-in-python chunk_size Finally a solution that works on general iterators an behaves as desired is def grouper n iterable it iter iterable..
Why does defining __getitem__ on a class make it iterable in python? http://stackoverflow.com/questions/926574/why-does-defining-getitem-on-a-class-make-it-iterable-in-python this question If you take a look at PEP234 defining iterators it says 1. An object can be iterated over with for if it implements..
Why isn't Python very good for functional programming? http://stackoverflow.com/questions/1017621/why-isnt-python-very-good-for-functional-programming as full of punctuation as explicitly passing arguments. Iterators instead of lazy lists means that you have to know whether you.. to scatter calls to list around if you want persistence. Iterators are use once Python's simple imperative syntax along with its..
Merge of lazy streams (using generators) in Python http://stackoverflow.com/questions/14648095/merge-of-lazy-streams-using-generators-in-python . See also e.g. Difference between Python Generators vs Iterators . We can do the merge like this instead def merge s1 s2 x1 x2..
http://stackoverflow.com/questions/19151/build-a-basic-python-iterator similar to the class Counter. David Mertz's article Iterators and Simple Generators is a pretty good introduction. share..
The Python yield keyword explained http://stackoverflow.com/questions/231767/the-python-yield-keyword-explained . Iterables are any objects you can get an iterator from. Iterators are objects that let you iterate on iterables. More about it..
Python: Am I missing something? [closed] http://stackoverflow.com/questions/566865/python-am-i-missing-something I would recommend that you read up on Generators Iterators itertools and above all List Comprehensions . These are the.. Fortescue This excellent presentation on Generators and Iterators by David Beazley from André Learn about Scons from the venerable..
Performance Advantages to Iterators? http://stackoverflow.com/questions/628903/performance-advantages-to-iterators Advantages to Iterators What if any performance advantages are offered by using iterators... a very good mail on the python mailing list about this Iterators vs Lists . It's a bit dated from 2003 but as far as I know it's..
wrapping a list of structs with boost.python http://stackoverflow.com/questions/6776888/wrapping-a-list-of-structs-with-boost-python Edit I will add here links that I've found useful Iterators StlContainers c python list wrapping boost python share improve..
Equivalent C++ to Python generator pattern http://stackoverflow.com/questions/9059187/equivalent-c-to-python-generator-pattern Generators exist in C just under another name Input Iterators . For example reading from std cin is similar to having a generator..
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