The equivalent in Windows, after unpacking the source archive, would have been: dir /s *itertools* -- Tim Roberts, timr at probo.com Providenza & Boekelheide, Inc. Tim Roberts at Sep 1, 2010 at 4:30 am Each nail sticks out of the wood at some length. Clash Royale CLAN TAG #URR8PPP up vote -2 down vote favorite There are N nails hammered into the same block of wood. In this example, s1 and s2 are set objects, which don’t keep their elements in any particular order. itertools.izip_longest(*iterables[, fillvalue]) 与izip()相同，但是迭代过程会持续到所有输入迭代变量iter1,iter2等都耗尽为止，如果没有使用fillvalue关键字参数指定不同的值，则使用None来填充已经使用的迭代变量的值。 importError: cannot import name ‘izip_longest’ 解决方法： itertools.izip在pyhton3中已被去掉了，zip成为内置的方法 返回的是迭代器 iterator， 而在python2 中返回的是 列表list。 找到使用了 from itertools import izip_longest 的文件， 将 izip_longest 改为 zip_longest。 Python 3.x has generally been made to be more "lazy" - i.e. It is a function that takes a series of iterables and returns one iterable. * 'module' object has no attribute 'urlencode' It's about urllib. Hello, I hope you are fine :) I'm writing in english for people who meet the same issue. One such itertools function is chain().. They make iterating through the iterables like lists and strings very easily. These examples are extracted from open source projects. The following are 30 code examples for showing how to use itertools.cycle(). map is now effectively itertools.imap, zip is itertools.izip, etc. If you really must have mutual imports in Python, the way to do it is to import them within a function: # In b.py: def cause_a_to_do_something(): import a a.do_something() The itertools is a module in Python having a collection of functions that are used for handling iterators. These examples are extracted from open source projects. Note: For more information, refer to Python Itertools chain() function. You have mutual top-level imports, which is almost always a bad idea. If you’re going to use the Python zip() function with unordered iterables like sets, then this is something to keep in mind.. In Python 3.x Do import urllib.parse instead. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. 在python3中，使用torndb进行查询时，遇到问题 AttributeError: module 'itertools' has no attribute 'izip'，解决该问题过程中耗费了不少时间，故把解决办法写下以便以后遇到该问题的人能更快速的解决：. These examples are extracted from open source projects. These examples are extracted from open source projects. Passing No Arguments. You can call zip() with no arguments as well. urlencode is part of urllib.parse This means that the tuples returned by zip() will have elements that are paired up randomly. The following are 30 code examples for showing how to use itertools.count(). You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You have mutual top-level imports, which don ’ t keep their elements in particular! 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