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Miscellaneous function (re)definitions from the Py3.4+ standard library
for Python 2.6/2.7.
- math.ceil (for Python 2.7)
- collections.OrderedDict (for Python 2.6)
- collections.Counter (for Python 2.6)
- collections.ChainMap (for all versions prior to Python 3.3)
- itertools.count (for Python 2.6, with step parameter)
- subprocess.check_output (for Python 2.6)
- reprlib.recursive_repr (for Python 2.6+)
- functools.cmp_to_key (for Python 2.6)
� )�absolute_importN)�ceil)�Mapping�MutableMapping)�
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Return the ceiling of x as an int.
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d%dd�Zdd� Zej ZZejZejZejZejZe� Zefdd�Zd&dd�Ze� dd� �Z d d � Z d d � Z e d'd d!��Z d"d#� Z!dS )(� OrderedDictz)Dictionary that remembers insertion orderc O s� | s t d��| d }| dd� } t| �dkr<t dt| � ��y
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r� t� |_t|j� |_}| |_|_i |_ Y nX |j
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zOrderedDict.__init__c C sZ || krJ|� | j |< }| j}|j}||| |_|_|_||_||�|_|| ||� dS )z!od.__setitem__(i, y) <==> od[i]=yN)r< r8 r/ r0 r ) r r �valueZ dict_setitemr ZLink�linkr@ �lastr r r � __setitem__� s
zOrderedDict.__setitem__c C s2 || |� | j �|�}|j}|j}||_||_dS )z od.__delitem__(y) <==> del od[y]N)r< �popr/ r0 )r r Z dict_delitemrC � link_prev� link_nextr r r � __delitem__� s
zOrderedDict.__delitem__c c s, | j }|j}x||k r&|jV |j}qW dS )zod.__iter__() <==> iter(od)N)r8 r0 r )r r@ �currr r r �__iter__� s
zOrderedDict.__iter__c c s, | j }|j}x||k r&|jV |j}qW dS )z#od.__reversed__() <==> reversed(od)N)r8 r/ r )r r@ rJ r r r � __reversed__� s
zOrderedDict.__reversed__c C s* | j }| |_|_| j�� t�| � dS )z.od.clear() -> None. Remove all items from od.N)r8 r/ r0 r< �clear�dict)r r@ r r r rM � s
zOrderedDict.clearTc C sj | s t d��| j}|r0|j}|j}||_||_n|j}|j}||_||_|j}| j|= t�| |�}||fS )z�od.popitem() -> (k, v), return and remove a (key, value) pair.
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zdictionary is empty)�KeyErrorr8 r/ r0 r r< rN rF )r rD r@ rC rG rH r rB r r r �popitem� s zOrderedDict.popitemc C sn | j | }|j}|j}||_||_| j}|rL|j}||_||_| |_|_n |j}||_||_| |_|_dS )z�Move an existing element to the end (or beginning if last==False).
Raises KeyError if the element does not exist.
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zOrderedDict.move_to_endc C sV t j}t| �d }|| j�}||| j�d 7 }||| j�| 7 }||| j�| 7 }|S )Nr5 � )�sys� getsizeofr7 �__dict__r< r: r8 )r Zsizeof�n�sizer r r �
__sizeof__� s
zOrderedDict.__sizeof__c C s0 || kr| | }| |= |S || j kr,t|��|S )z�od.pop(k[,d]) -> v, remove specified key and return the corresponding
value. If key is not found, d is returned if given, otherwise KeyError
is raised.
)�_OrderedDict__markerrO )r r �defaultr! r r r rF � s
zOrderedDict.popNc C s || kr| | S || |< |S )zDod.setdefault(k[,d]) -> od.get(k,d), also set od[k]=d if k not in odr )r r r[ r r r �
setdefault s zOrderedDict.setdefaultc C s* | sd| j jf S d| j jt| �� �f S )zod.__repr__() <==> repr(od)z%s()z%s(%r))� __class__r( �list�items)r r r r �__repr__ s zOrderedDict.__repr__c C sH t | ��� }x t t� �D ]}|�|d� qW | jd|p8ddt| �� �fS )z%Return state information for picklingNr )�vars�copyr4 rF r] �iterr_ )r Z inst_dict�kr r r �
__reduce__ s zOrderedDict.__reduce__c C s
| � | �S )z!od.copy() -> a shallow copy of od)r] )r r r r rb s zOrderedDict.copyc C s | � }x|D ] }|||< q W |S )zOD.fromkeys(S[, v]) -> New ordered dictionary with keys from S.
If not specified, the value defaults to None.
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zOrderedDict.fromkeysc C s2 t |t�r&t�| |�o$ttt| |��S t�| |�S )z�od.__eq__(y) <==> od==y. Comparison to another OD is order-sensitive
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zOrderedDict.__eq__)T)T)N)N)"r( r& r2 r' rA rN rE r; r. rI rK rL rM rP rR rY r �updater= �keys�valuesr_ �__ne__�objectrZ rF r\ r- r` re rb � classmethodrh rj r r r r r4 [ s0
r4 )r )�nlargestc C s* | j }x |D ]}||d�d | |< q W dS )z!Tally elements from the iterable.r r5 N)�get)�mappingrg Z mapping_get�elemr r r �_count_elements: s
ry c s� e Zd ZdZ� fdd�Zdd� Zd/dd�Zd d
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dd� Z dd� Z dd� Z
� fdd�Zdd� Zdd� Zdd � Zd d � Zd d � Zd!d"� Zd#d$� Zd%d&� Zd'd(� Zd)d*� Zd+d,� Zd-d.� Z� ZS )1�Countera� Dict subclass for counting hashable items. Sometimes called a bag
or multiset. Elements are stored as dictionary keys and their counts
are stored as dictionary values.
>>> c = Counter('abcdeabcdabcaba') # count elements from a string
>>> c.most_common(3) # three most common elements
[('a', 5), ('b', 4), ('c', 3)]
>>> sorted(c) # list all unique elements
['a', 'b', 'c', 'd', 'e']
>>> ''.join(sorted(c.elements())) # list elements with repetitions
'aaaaabbbbcccdde'
>>> sum(c.values()) # total of all counts
15
>>> c['a'] # count of letter 'a'
5
>>> for elem in 'shazam': # update counts from an iterable
... c[elem] += 1 # by adding 1 to each element's count
>>> c['a'] # now there are seven 'a'
7
>>> del c['b'] # remove all 'b'
>>> c['b'] # now there are zero 'b'
0
>>> d = Counter('simsalabim') # make another counter
>>> c.update(d) # add in the second counter
>>> c['a'] # now there are nine 'a'
9
>>> c.clear() # empty the counter
>>> c
Counter()
Note: If a count is set to zero or reduced to zero, it will remain
in the counter until the entry is deleted or the counter is cleared:
>>> c = Counter('aaabbc')
>>> c['b'] -= 2 # reduce the count of 'b' by two
>>> c.most_common() # 'b' is still in, but its count is zero
[('a', 3), ('c', 1), ('b', 0)]
c sZ | s t d��| d }| dd� } t| �dkr<t dt| � ��tt|��� |j| |� dS )a Create a new, empty Counter object. And if given, count elements
from an input iterable. Or, initialize the count from another mapping
of elements to their counts.
>>> c = Counter() # a new, empty counter
>>> c = Counter('gallahad') # a new counter from an iterable
>>> c = Counter({'a': 4, 'b': 2}) # a new counter from a mapping
>>> c = Counter(a=4, b=2) # a new counter from keyword args
z;descriptor '__init__' of 'Counter' object needs an argumentr r5 Nz$expected at most 1 arguments, got %d)r6 r7 �superrz rA ro )r> r? r )r] r r rA s s zCounter.__init__c C s dS )z1The count of elements not in the Counter is zero.r r )r r r r r � __missing__� s zCounter.__missing__Nc C s6 |dkr t | �� td�dd�S tj|| �� td�d�S )z�List the n most common elements and their counts from the most
common to the least. If n is None, then list all element counts.
>>> Counter('abcdeabcdabcaba').most_common(3)
[('a', 5), ('b', 4), ('c', 3)]
Nr5 T)r �reverse)r )�sortedr_ � _itemgetter�_heapqru )r rW r r r � most_common� s zCounter.most_commonc C s t �tt| �� ��S )a� Iterator over elements repeating each as many times as its count.
>>> c = Counter('ABCABC')
>>> sorted(c.elements())
['A', 'A', 'B', 'B', 'C', 'C']
# Knuth's example for prime factors of 1836: 2**2 * 3**3 * 17**1
>>> prime_factors = Counter({2: 2, 3: 3, 17: 1})
>>> product = 1
>>> for factor in prime_factors.elements(): # loop over factors
... product *= factor # and multiply them
>>> product
1836
Note, if an element's count has been set to zero or is a negative
number, elements() will ignore it.
)�_chain�
from_iterable�_starmap�_repeatr_ )r r r r �elements� s zCounter.elementsc C s t d��d S )Nz@Counter.fromkeys() is undefined. Use Counter(iterable) instead.)�NotImplementedError)rf rg �vr r r rh � s zCounter.fromkeysc s� | s t d��| d }| dd� } t| �dkr<t dt| � ��| rH| d nd}|dk r�t|t�r�|r�|j}x8|�� D ]\}}|||d� ||< qrW q�tt|��|� n
t ||� |r�|�|� dS )a� Like dict.update() but add counts instead of replacing them.
Source can be an iterable, a dictionary, or another Counter instance.
>>> c = Counter('which')
>>> c.update('witch') # add elements from another iterable
>>> d = Counter('watch')
>>> c.update(d) # add elements from another counter
>>> c['h'] # four 'h' in which, witch, and watch
4
z9descriptor 'update' of 'Counter' object needs an argumentr r5 Nz$expected at most 1 arguments, got %d)
r6 r7 ri r rv r_ r{ rz ro ry )r> r? r rg �self_getrx �count)r] r r ro � s"
zCounter.updatec O s� | s t d��| d }| dd� } t| �dkr<t dt| � ��| rH| d nd}|dk r�|j}t|t�r�xH|�� D ]\}}||d�| ||< qnW n x |D ]}||d�d ||< q�W |r�|�|� dS )a� Like dict.update() but subtracts counts instead of replacing them.
Counts can be reduced below zero. Both the inputs and outputs are
allowed to contain zero and negative counts.
Source can be an iterable, a dictionary, or another Counter instance.
>>> c = Counter('which')
>>> c.subtract('witch') # subtract elements from another iterable
>>> c.subtract(Counter('watch')) # subtract elements from another counter
>>> c['h'] # 2 in which, minus 1 in witch, minus 1 in watch
0
>>> c['w'] # 1 in which, minus 1 in witch, minus 1 in watch
-1
z;descriptor 'subtract' of 'Counter' object needs an argumentr r5 Nz$expected at most 1 arguments, got %d)r6 r7 rv ri r r_ �subtract)r> r? r rg r� rx r� r r r r� � s
zCounter.subtractc C s
| � | �S )zReturn a shallow copy.)r] )r r r r rb s z Counter.copyc C s | j t| �ffS )N)r] rN )r r r r re s zCounter.__reduce__c s || krt t| ��|� dS )zGLike dict.__delitem__() but does not raise KeyError for missing values.N)r{ rz rI )r rx )r] r r rI s zCounter.__delitem__c C s` | sd| j j S y&d�tdj| �� ��}d| j j|f S tk
rZ d�| j jt| ��S X d S )Nz%s()z, z%r: %rz%s({%s})z
{0}({1!r})) r] r( �joinrl �__mod__r� r6 �formatrN )r r_ r r r r` s zCounter.__repr__c C sx t |t�stS t� }x0| �� D ]$\}}||| }|dkr |||< q W x,|�� D ] \}}|| krP|dkrP|||< qPW |S )zAdd counts from two counters.
>>> Counter('abbb') + Counter('bcc')
Counter({'b': 4, 'c': 2, 'a': 1})
r )ri rz �NotImplementedr_ )r rn r! rx r� �newcountr r r �__add__$ s
zCounter.__add__c C s| t |t�stS t� }x0| �� D ]$\}}||| }|dkr |||< q W x0|�� D ]$\}}|| krP|dk rPd| ||< qPW |S )z� Subtract count, but keep only results with positive counts.
>>> Counter('abbbc') - Counter('bccd')
Counter({'b': 2, 'a': 1})
r )ri rz r� r_ )r rn r! rx r� r� r r r �__sub__7 s
zCounter.__sub__c C s� t |t�stS t� }x<| �� D ]0\}}|| }||k r:|n|}|dkr |||< q W x,|�� D ] \}}|| kr\|dkr\|||< q\W |S )z�Union is the maximum of value in either of the input counters.
>>> Counter('abbb') | Counter('bcc')
Counter({'b': 3, 'c': 2, 'a': 1})
r )ri rz r� r_ )r rn r! rx r� � other_countr� r r r �__or__J s
zCounter.__or__c C sV t |t�stS t� }x<| �� D ]0\}}|| }||k r:|n|}|dkr |||< q W |S )z� Intersection is the minimum of corresponding counts.
>>> Counter('abbb') & Counter('bcc')
Counter({'b': 1})
r )ri rz r� r_ )r rn r! rx r� r� r� r r r �__and__^ s
zCounter.__and__c C s
| t � S )zEAdds an empty counter, effectively stripping negative and zero counts)rz )r r r r �__pos__o s zCounter.__pos__c C s
t � | S )z{Subtracts from an empty counter. Strips positive and zero counts,
and flips the sign on negative counts.
)rz )r r r r �__neg__s s zCounter.__neg__c C s* dd� | � � D �}x|D ]
}| |= qW | S )z?Internal method to strip elements with a negative or zero countc S s g | ]\}}|d ks|�qS )r r )�.0rx r� r r r �
<listcomp>| s z*Counter._keep_positive.<locals>.<listcomp>)r_ )r � nonpositiverx r r r �_keep_positivez s
zCounter._keep_positivec C s. x$|� � D ]\}}| | |7 < q
W | �� S )z�Inplace add from another counter, keeping only positive counts.
>>> c = Counter('abbb')
>>> c += Counter('bcc')
>>> c
Counter({'b': 4, 'c': 2, 'a': 1})
)r_ r� )r rn rx r� r r r �__iadd__� s zCounter.__iadd__c C s. x$|� � D ]\}}| | |8 < q
W | �� S )z�Inplace subtract counter, but keep only results with positive counts.
>>> c = Counter('abbbc')
>>> c -= Counter('bccd')
>>> c
Counter({'b': 2, 'a': 1})
)r_ r� )r rn rx r� r r r �__isub__� s zCounter.__isub__c C s6 x,|� � D ] \}}| | }||kr
|| |< q
W | �� S )z�Inplace union is the maximum of value from either counter.
>>> c = Counter('abbb')
>>> c |= Counter('bcc')
>>> c
Counter({'b': 3, 'c': 2, 'a': 1})
)r_ r� )r rn rx r� r� r r r �__ior__� s
zCounter.__ior__c C s6 x,| � � D ] \}}|| }||k r
|| |< q
W | �� S )z�Inplace intersection is the minimum of corresponding counts.
>>> c = Counter('abbb')
>>> c &= Counter('bcc')
>>> c
Counter({'b': 1})
)r_ r� )r rn rx r� r� r r r �__iand__� s
zCounter.__iand__)N)N) r( r& r2 r' rA r| r� r� rt rh ro r� rb re rI r` r� r� r� r� r� r� r� r� r� r� r� �
__classcell__r r )r] r rz @ s0 +
)#
rz c O sh d|krt d��tj| dtji|��}|�� \}}|�� }|rd|�d�}|dkrX| d }t�||��|S )z[
For Python 2.6 compatibility: see
http://stackoverflow.com/questions/4814970/
�stdoutz3stdout argument not allowed, it will be overridden.r> Nr )�
ValueError�
subprocess�Popen�PIPEZ communicateZpollrv ZCalledProcessError)Z popenargs�kwargsZprocess�outputZ
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r� r5 c c s x| V | |7 } qW dS )z�
``itertools.count`` in Py 2.6 doesn't accept a step
parameter. This is an enhanced version of ``itertools.count``
for Py2.6 equivalent to ``itertools.count`` in Python 2.7+.
Nr )�start�stepr r r r� � s r� c @ s� e Zd ZdZdd� Zdd� Zdd� Zd'd d
�Zd d � Zd
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� dd� �Zedd� �Zdd� ZeZd(dd�Zedd � �Zd d � Zd d � Zd!d"� Zd#d$� Zd%d&� ZdS ))�ChainMapa� A ChainMap groups multiple dicts (or other mappings) together
to create a single, updateable view.
The underlying mappings are stored in a list. That list is public and can
accessed or updated using the *maps* attribute. There is no other state.
Lookups search the underlying mappings successively until a key is found.
In contrast, writes, updates, and deletions only operate on the first
mapping.
c G s t |�p i g| _dS )z�Initialize a ChainMap by setting *maps* to the given mappings.
If no mappings are provided, a single empty dictionary is used.
N)r^ �maps)r r� r r r rA � s zChainMap.__init__c C s t |��d S )N)rO )r r r r r r| � s zChainMap.__missing__c C s8 x,| j D ]"}y|| S tk
r( Y qX qW | �|�S )N)r� rO r| )r r rw r r r � __getitem__� s
zChainMap.__getitem__Nc C s || kr| | S |S )Nr )r r r[ r r r rv � s z ChainMap.getc C s t t� j| j� �S )N)r7 r* �unionr� )r r r r �__len__ s zChainMap.__len__c C s t t� j| j� �S )N)rc r* r� r� )r r r r rK s zChainMap.__iter__c s t � fdd�| jD ��S )Nc 3 s | ]}� |kV qd S )Nr )r� �m)r r r � <genexpr> s z(ChainMap.__contains__.<locals>.<genexpr>)�anyr� )r r r )r r � __contains__ s zChainMap.__contains__c C s
t | j�S )N)r� r� )r r r r �__bool__ s zChainMap.__bool__c C s d� | d�tt| j���S )Nz{0.__class__.__name__}({1})z, )r� r� rl �reprr� )r r r r r` s zChainMap.__repr__c G s | t j|f|�� �S )z?Create a ChainMap with a single dict created from the iterable.)rN rh )rf rg r> r r r rh s zChainMap.fromkeysc C s$ | j | jd �� f| jdd� �� S )zHNew ChainMap or subclass with a new copy of maps[0] and refs to maps[1:]r r5 N)r] r� rb )r r r r rb s z
ChainMap.copyc C s |dkr i }| j |f| j�� S )z�
New ChainMap with a new map followed by all previous maps. If no
map is provided, an empty dict is used.
N)r] r� )r r� r r r � new_child s zChainMap.new_childc C s | j | jdd� � S )zNew ChainMap from maps[1:].r5 N)r] r� )r r r r �parents( s zChainMap.parentsc C s || j d |< d S )Nr )r� )r r rB r r r rE - s zChainMap.__setitem__c C s8 y| j d |= W n" tk
r2 td�|���Y nX d S )Nr z)Key not found in the first mapping: {0!r})r� rO r� )r r r r r rI 0 s zChainMap.__delitem__c C s0 y| j d �� S tk
r* td��Y nX dS )zPRemove and return an item pair from maps[0]. Raise KeyError is maps[0] is empty.r z#No keys found in the first mapping.N)r� rP rO )r r r r rP 6 s zChainMap.popitemc G s> y| j d j|f|�� S tk
r8 td�|���Y nX dS )zWRemove *key* from maps[0] and return its value. Raise KeyError if *key* not in maps[0].r z)Key not found in the first mapping: {0!r}N)r� rF rO r� )r r r> r r r rF = s z ChainMap.popc C s | j d �� dS )z'Clear maps[0], leaving maps[1:] intact.r N)r� rM )r r r r rM D s zChainMap.clear)N)N)r( r& r2 r' rA r| r� rv r� rK r� r� Z __nonzero__r- r` rt rh rb �__copy__r� �propertyr� rE rI rP rF rM r r r r r� � s*
r� )�_GLOBAL_DEFAULT_TIMEOUTc C s� | \}}d}x�t ||dt�D ]�}|\}}} }
} d} y:t||| �} |tk rR| �|� |r`| �|� | �| � | S tk
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X Y q X q W |dk r�|�ntd��dS )a� Backport of 3-argument create_connection() for Py2.6.
Connect to *address* and return the socket object.
Convenience function. Connect to *address* (a 2-tuple ``(host,
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