All you need to do is add them:

    &gt;&gt;&gt; from collections import Counter
    &gt;&gt;&gt; a = Counter({&#39;menu&#39;: 20, &#39;good&#39;: 15, &#39;happy&#39;: 10, &#39;bar&#39;: 5})
    &gt;&gt;&gt; b = Counter({&#39;menu&#39;: 1, &#39;good&#39;: 1, &#39;bar&#39;: 3})
    &gt;&gt;&gt; a + b
    Counter({&#39;menu&#39;: 21, &#39;good&#39;: 16, &#39;happy&#39;: 10, &#39;bar&#39;: 8})

From the [docs](http://docs.python.org/2/library/collections.html#collections.Counter):

&gt;Several mathematical operations are provided for combining Counter objects to produce multisets (counters that have counts greater than zero). Addition and subtraction combine counters by adding or subtracting the counts of corresponding elements. 

Note that if you want to save memory by modifying the `Counter` in-place rather than creating a new one, you can do `a.update(b)` or `b.update(a)`.

I&#39;ve now updated three of my apps to iOS 7, but in all three, despite them not sharing any code, I have the problem where if the user swipes to go back in the navigation controller (rather than tap the back button) quickly, the cell will remain in its selected state.

For the three apps, one uses custom cells created programmatically, another uses custom cells created in a storyboard and the third uses default cells in a very basic subclass of UITableView, also in a storyboard. In all three cases, the cells don&#39;t deselect by themselves. If the user swipes slowly, or hits the back button, they deselect as normal.

This is only happening in my iOS 7 apps, Apple&#39;s own apps and third party apps upgraded for iOS 7 all seem to be behaving normally (albeit with slight differences in how quickly the cells gets deselected).

There must be something I&#39;m doing wrong, but I&#39;m not sure what?

UITableViewCell doesn&#39;t get deselected when swiping back quickly

With Android 4.4 KitKat, Google is upgrading linux kernel to version 3.8 which is the required kernel version for Docker.

I don&#39;t know the AUFS part but will there be a way to run docker containers on android with this update?

Running docker on Android

I am working with `collections.Counter()` counters.  I would like to combine two of them in a meaningful manner.

Suppose I have 2 counters, say,  
    
    Counter({&#39;menu&#39;: 20, &#39;good&#39;: 15, &#39;happy&#39;: 10, &#39;bar&#39;: 5})

and
    
    Counter({&#39;menu&#39;: 1, &#39;good&#39;: 1, &#39;bar&#39;: 3})

I am trying to end up with:   
    
    Counter({&#39;menu&#39;: 21, &#39;good&#39;: 16, &#39;happy&#39;: 10,&#39;bar&#39;: 8})

How can I do this?

Summing the contents of two collections.Counter() objects

I am working with <code>collections.Counter()</code> counters. I would like to combine two of them in a meaningful manner.
Suppose I have 2 counters, say,
<pre><code class="hljs language-css">Counter({'menu': 20, 'good': 15, 'happy': 10, 'bar': 5})
</code></pre>
and
<pre><code class="hljs language-css">Counter({'menu': 1, 'good': 1, 'bar': 3})
</code></pre>
I am trying to end up with:
<pre><code class="hljs language-css">Counter({'menu': 21, 'good': 16, 'happy': 10,'bar': 8})
</code></pre>
How can I do this?

I found one interesting observation.
I had written one config file read program as,

    import ConfigParser
    class  ConfReader(object):
        ConfMap = dict()
    
        def __init__(self):
            self.config = ConfigParser.ConfigParser()
            self.config.read(&#39;./Config.ini&#39;)
            self.__loadConfigMap()
        
        def __loadConfigMap(self):
            for sec in self.config.sections():
                for key,value in self.config.items(sec):
                    print &#39;key = &#39;, key, &#39;Value = &#39;, value
                    keyDict = str(sec) + &#39;_&#39; + str(key)
                    print &#39;keyDict = &#39; + keyDict  
                    self.ConfMap[keyDict] = value
                
        def getValue(self, key):
            value = &#39;&#39;
            try:
                print &#39; Key = &#39;, key
                value = self.ConfMap[key] 
            except KeyError as KE:
                print &#39;Key&#39;, KE , &#39; didn\&#39;t found in configuration.&#39;
        return value

    class MyConfReader(object):
        objConfReader = ConfReader()
    
    def main():
         print MyConfReader().objConfReader.getValue(&#39;DB2.poolsize&#39;)
         print MyConfReader().objConfReader.getValue(&#39;DB_NAME&#39;)

    if __name__==&#39;__main__&#39;:
        main()

And my Config.ini file looks like,

    [DB]
    HOST_NAME=localhost
    NAME=temp
    USER_NAME=postgres
    PASSWORD=mandy


The  __loadConfigMap() works just fine. But while reading the key and values, it is making the keys lower case. I didn&#39;t understand the reason. Can any one please explain why it is so?

ConfigParser reads capital keys and make them lower case

If I have an empty dataframe as such:

    columns = [&#39;Date&#39;, &#39;Name&#39;, &#39;Action&#39;,&#39;ID&#39;]
    df = pd.DataFrame(columns=columns) 

is there a way to append a new row to this newly created dataframe? Currently I have to create a dictionary, populate it, then append the dictionary to the dataframe at the end. Is there a more direct way? 

How to add an extra row to a pandas dataframe

I&#39;d like to create a program that runs multiple light threads, but limits itself to a constant, predefined number of concurrent running tasks, like this (but with no risk of race condition):

    import threading
    
    def f(arg):
        global running
        running += 1
        print(&quot;Spawned a thread. running=%s, arg=%s&quot; % (running, arg))
        for i in range(100000):
            pass
        running -= 1
        print(&quot;Done&quot;)
    
    running = 0
    while True:
        if running &lt; 8:
            arg = get_task()
            threading.Thread(target=f, args=[arg]).start()

What&#39;s the safest/fastest way to implement this?


The right way to limit maximum number of threads running at once?

i&#39;m reciving the following error in my program:
Traceback:

    Traceback (most recent call last):
    File &quot;C:\Python33\Archive\PythonGrafos\Alpha.py&quot;, line 126, in &lt;module&gt;
    menugrafos()
    File &quot;C:\Python33\Archive\PythonGrafos\Alpha.py&quot;, line 97, in menugrafos
    zetta = Beta.caminhografo(grafo,va,vb)
    File &quot;C:\Python33\Archive\PythonGrafos\Beta.py&quot;, line 129, in caminhografo
    if ([vo, a]) in vat == ([vo,vq]) in vat:
    TypeError: unhashable type: &#39;list&#39;

The program is meant to do an adjacency list which works fine and then proceed to search if there is a path between vertex va and vb. I used a dictionary of lists in collection/defaultdict so i can properly append adjacent vertex.

The problem is in the if clauses after the list is created at the end of the program. I can&#39;t find a way to properly use the if clauses with the dict to find if there is a valid path between vertex. Also grafo is a graph class.

Here is the code:

    class graph:
        v = 0
        a = 0
        node = []
    
    class vertex:
        ta = []
        adj = {}
        
    def caminhografo(grafo, va, vb):
        vat = defaultdict(list)
        i = 0
        a = 0
        z = 0
        vo = int(va)
        vq = int(vb)
        vz = int(va)
        vw = int(vb)
        x = len(grafo.node)
        if vz &lt; vw:
            for vz in range (vw+1):
                a = 0
                x = len(grafo.node)
                for a in range (x):
                    if [int(vz),int(a)] in grafo.node:
                        vat[vz].append(a)                   
        if vz &gt; vw:
            while vz &gt; vw:
                a = 0
                x = len(grafo.node)
                for a in range (x):
                    if[int(va),int(a)] in grafo.node:
                        vat[vz].append(a)
                vz = vz - 1
        a = 0
        x = len(grafo.node)
        print(vat)
        for a in range (x):
           if ([vo, a]) in vat == ([vo,vq]) in vat:
               print(&quot;&quot;&quot;
        ==============================================
                   Existe Caminho
        ==============================================
        &quot;&quot;&quot;)
               break
           elif ([vo,a]) in vat:
               vo = a
           else:           
               print(&quot;&quot;&quot;
        ==============================================
                 N&#227;o Existe Caminho
        ==============================================
            &quot;&quot;&quot;)
               break
    
Thanks for any assistance.
    



Python, TypeError: unhashable type: &#39;list&#39;

How can I open files in a zip archive without extracting them first?

I&#39;m using pygame. To save disk space, I have all the images zipped up.
Is it possible to load a given image directly from the zip file? 
For example:
`pygame.image.load(&#39;zipFile/img_01&#39;)`

Python: Open file in zip without temporarily extracting it

How would I go about counting the words in a sentence? I&#39;m using Python.

For example, I might have the string: 

    string = &quot;I     am having  a   very  nice  23!@$      day. &quot;

That would be 7 words. I&#39;m having trouble with the random amount of spaces after/before each word as well as when numbers or symbols are involved. 

How to count the number of words in a sentence, ignoring numbers, punctuation and whitespace?

Other than doing list comprehensions of reversed list comprehension, is there a pythonic way to sort Counter by value? If so, it is faster than this:

    &gt;&gt;&gt; from collections import Counter
    &gt;&gt;&gt; x = Counter({&#39;a&#39;:5, &#39;b&#39;:3, &#39;c&#39;:7})
    &gt;&gt;&gt; sorted(x)
    [&#39;a&#39;, &#39;b&#39;, &#39;c&#39;]
    &gt;&gt;&gt; sorted(x.items())
    [(&#39;a&#39;, 5), (&#39;b&#39;, 3), (&#39;c&#39;, 7)]
    &gt;&gt;&gt; [(l,k) for k,l in sorted([(j,i) for i,j in x.items()])]
    [(&#39;b&#39;, 3), (&#39;a&#39;, 5), (&#39;c&#39;, 7)]
    &gt;&gt;&gt; [(l,k) for k,l in sorted([(j,i) for i,j in x.items()], reverse=True)]
    [(&#39;c&#39;, 7), (&#39;a&#39;, 5), (&#39;b&#39;, 3)

How to sort Counter by value? - python

I used `Counter` on a list to compute this variable:

    final = Counter(event_container)

print final gives:

    Counter({&#39;fb_view_listing&#39;: 76, &#39;fb_homescreen&#39;: 63, &#39;rt_view_listing&#39;: 50, &#39;rt_home_start_app&#39;: 46, &#39;fb_view_wishlist&#39;: 39, &#39;fb_view_product&#39;: 37, &#39;fb_search&#39;: 29, &#39;rt_view_product&#39;: 23, &#39;fb_view_cart&#39;: 22, &#39;rt_search&#39;: 12, &#39;rt_view_cart&#39;: 12, &#39;add_to_cart&#39;: 2, &#39;create_campaign&#39;: 1, &#39;fb_connect&#39;: 1, &#39;sale&#39;: 1, &#39;guest_sale&#39;: 1, &#39;remove_from_cart&#39;: 1, &#39;rt_transaction_confirmation&#39;: 1, &#39;login&#39;: 1})

Now I want to convert `final` into a Pandas `DataFrame`, but when I&#39;m doing:

    final_df = pd.DataFrame(final)

but I got an error.

I guess final is not a proper dictionary, so how can I convert `final` to a dictionary? Or is it an other way to convert `final` to a `DataFrame`?

Content Type	Original Author	Original Content on Stackoverflow
Question	tumultous_rooster	View Question on Stackoverflow
Solution 1 - Python	TerryA	View Answer on Stackoverflow

Summing the contents of two collections.Counter() objects

Python Problem Overview

Python Solutions

Solution 1 - Python

Running docker on Android

UITableViewCell doesn't get deselected when swiping back quickly

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