blocks|key|4197288|text|groupby通过一些key对连续的迭代器进行分组。如果未指定键，则默认的分组谓词是连续的元素应该相同。因此，总而言之，groupby将相同的连续元素组合在一起。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4197289|耗尽groupby，您会看到它返回元组：|4197290|list(groupby('aaacaccccccbbbb'))

[('a',+<itertools._grouper+at+0x12f132a58>),
+('c',+<itertools._grouper+at+0x12f132d30>),
+('a',+<itertools._grouper+at+0x12f132cf8>),
+('c',+<itertools._grouper+at+0x12f1b9da0>),
+('b',+<itertools._grouper+at+0x12f1a68d0>)]|code-block|syntax|javascript|4197291|每个元组是一对<group_key,+[group_values_iterator]>，对应于列表理解中的str和grp。grp基本上就是该组中的元素。列表理解耗尽了grp迭代器并将字符连接在一起。|4197292|entityMap^0|0|7|B|3|1O|7|0|2|7|0|0|7|10|1H|3|1L|3|1P|3|2B|3|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]|$9|T|A|U|B|C]|$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|X|8|@$9|Y|A|Z|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|10|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|11|8|@$9|12|A|13|B|C]|$9|14|A|15|B|C]|$9|16|A|17|B|C]|$9|18|A|19|B|C]|$9|1A|A|1B|B|C]]|D|@]|E|$]]|$1|O|3|-4|5|6|7|1C|8|@]|D|@]|E|$]]]|P|$]]

<code>groupby</code> groups consecutive iterators by some <code>key</code>. If no key is specified, the default grouping predicate is that the consecutive elements should be the same. So, to summarise, <code>groupby</code> groups identical consecutive elements together.

Exhausting the <code>groupby</code>, you see it returns tuples:

<pre><code>list(groupby('aaacaccccccbbbb'))

[('a', &lt;itertools._grouper at 0x12f132a58&gt;),
 ('c', &lt;itertools._grouper at 0x12f132d30&gt;),
 ('a', &lt;itertools._grouper at 0x12f132cf8&gt;),
 ('c', &lt;itertools._grouper at 0x12f1b9da0&gt;),
 ('b', &lt;itertools._grouper at 0x12f1a68d0&gt;)]
</code></pre>

Each tuple is a pair of <code>&lt;group_key, [group_values_iterator]&gt;</code>, which corresponds to <code>str</code> and <code>grp</code> in the list comprehension. <code>grp</code> is basically the elements in that group. The list comprehension is exhausting the <code>grp</code> iterator and joining the characters together.

blocks|key|4197279|text|不要使用内置变量名：str,int,set,dict,tuple,list,max,min,...|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4197280|如果有疑问，请将列表理解分成几个部分，并将它们提供给打印报表(How+to+debug+small+programs)：|4197281|from+itertools+import+groupby
grouping+=+groupby('aaacaccccccbbbb')

for+stri,+grp+in+grouping:+
++++print(stri)++++++++++++++#+key+of+the+grouping
++++print(list(grp))+++++++++#+group+(use+list+to+show+it+instead+of+the+groupingiterable)
++++print("")|code-block|syntax|javascript|4197282|输出：|4197283|a
['a',+'a',+'a']

c
['c']

a
['a']

c
['c',+'c',+'c',+'c',+'c',+'c']

b
['b',+'b',+'b',+'b']|4197284|如果你仍然对它有疑问，请阅读API或搜索SO：How+do+I+use+Python's+itertools.groupby()?|4197285|entityMap|0|LINK|mutability|MUTABLE|url|https://ericlippert.com/2014/03/05/how-to-debug-small-programs/|1|https://stackoverflow.com/questions/773/how-do-i-use-pythons-itertools-groupby^0|A|13|0|V|R|0|0|0|0|0|N|16|1|0^^$0|@$1|2|3|4|5|6|7|12|8|@$9|13|A|14|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|15|8|@]|D|@$9|16|A|17|1|18]]|E|$]]|$1|H|3|I|5|J|7|19|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|1A|8|@]|D|@]|E|$]]|$1|O|3|P|5|J|7|1B|8|@]|D|@]|E|$K|L]]|$1|Q|3|R|5|6|7|1C|8|@]|D|@$9|1D|A|1E|1|1F]]|E|$]]|$1|S|3|-4|5|6|7|1G|8|@]|D|@]|E|$]]]|T|$U|$5|V|W|X|E|$Y|Z]]|10|$5|V|W|X|E|$Y|11]]]]

Do not use built-ins as variable names: <code>str,int,set,dict,tuple,list,max,min,...</code>

If in doubt, dissabssemble list comprehensions into its parts and supply them to print statements (<a href="https://ericlippert.com/2014/03/05/how-to-debug-small-programs/" rel="nofollow noreferrer">How to debug small programs</a>):

<pre><code>from itertools import groupby
grouping = groupby('aaacaccccccbbbb')

for stri, grp in grouping: 
 print(stri) # key of the grouping
 print(list(grp)) # group (use list to show it instead of the groupingiterable)
 print("")
</code></pre>

Output:

<pre><code>a
['a', 'a', 'a']

c
['c']

a
['a']

c
['c', 'c', 'c', 'c', 'c', 'c']

b
['b', 'b', 'b', 'b']
</code></pre>

If you still got questions about it, read the API or search SO: <a href="https://stackoverflow.com/questions/773/how-do-i-use-pythons-itertools-groupby">How do I use Python&#39;s itertools.groupby()?</a>

I need some explanation as to how this code works. I do not understand the need for 'str' and 'grp' within the for loop. What are they keeping track of?

<pre><code>from itertools import groupby
print(["".join(grp) for str, grp in groupby('aaacaccccccbbbb')])
</code></pre>

Grouping string into substrings

我需要一些关于这个代码是如何工作的解释。我不明白为什么在for循环中需要'str‘和'grp’。他们在跟踪什么？from itertools import groupbyprint(["".join(grp) for str, grp in groupby('aaacaccccccbbbb')])

问将字符串分组为子字符串
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