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The detect_encoding() function is used to detect the encoding that should be used to decode a Python source file. It requires one argument, readline, in the same way as the tokenize() generator. It will call readline a maximum of twice, and return the encoding used (as a string) and a list of any lines (left as bytes) it has read in. It detects the encoding from the presence of a utf-8 bom or an encoding cookie as specified in pep-0263. If both a bom and a cookie are present, but disagree, a SyntaxError will be raised. If the encoding cookie is an invalid charset, raise a SyntaxError. Note that if a utf-8 bom is found, 'utf-8-sig' is returned. If no encoding is specified, then the default of 'utf-8' will be returned. NFr c s" z� � W S t y Y dS 0 d S )Nrn )� StopIterationr )�readliner r � read_or_stop� s z%detect_encoding.<locals>.read_or_stopc s� z| � d�}W n2 ty@ d}�d ur4d�|��}t|��Y n0 t�|�}|sTd S t|d �}z t|�}W n8 ty� �d u r�d| }n d��|�}t|��Y n0 � r�|j dkrԈd u r�d}n d���}t|��|d 7 }|S ) Nr z'invalid or missing encoding declarationz {} for {!r}r zunknown encoding: z unknown encoding for {!r}: {}zencoding problem: utf-8z encoding problem for {!r}: utf-8z-sig) r� �UnicodeDecodeError�format� SyntaxError� cookie_re�findallr� r� � LookupErrorr� )�line� line_string�msg�matches�encoding�codec)� bom_foundr� r r � find_cookie� s8 � z$detect_encoding.<locals>.find_cookieTr z utf-8-sig)�__self__r� �AttributeErrorr> r� )r� r� �defaultr� r� �first�secondr )r� r� r� r r� } s4 & r� )r? r( )r � )�unescape)�ChainMap)�MutableMapping)�recursive_repr�...c s � fdd�}|S )zm Decorator to make a repr function return fillvalue for a recursive call c sL t � � �� �fdd�}t�d�|_t�d�|_t�d�|_t�di �|_|S )Nc sL t | �t� f}|�v r� S ��|� z�| �}W ��|� n ��|� 0 |S rR )�id� get_identr{ �discard)rV rM �result)� fillvalue� repr_running� user_functionr r �wrapper� s z=_recursive_repr.<locals>.decorating_function.<locals>.wrapperr5 rY r4 �__annotations__)ry �getattrr5 rY r4 r� )r� r� �r� )r� r� r �decorating_function� s z,_recursive_repr.<locals>.decorating_functionr )r� r� r r� r �_recursive_repr� s r� c @ s� e Zd ZdZdd� Zdd� Zdd� Zd'd d �Zd d � Zd d� Z dd� Z dd� Z e � dd� �Z edd� �Zdd� ZeZdd� Zedd � �Zd d � Zd d � Zd!d"� Zd#d$� Zd%d&� ZdS )(r� a� 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)�list�maps)rV r� r r r rX s zChainMap.__init__c C s t |��d S rR )�KeyError�rV rM r r r � __missing__ s zChainMap.__missing__c C s8 | j D ]&}z|| W S ty* Y q0 q| �|�S rR )r� r� r� )rV rM �mappingr r r � __getitem__ s zChainMap.__getitem__Nc C s || v r| | S |S rR r �rV rM r� r r r rJ % s z ChainMap.getc C s t t� j| j� �S rR )rK ry �unionr� r� r r r �__len__( s zChainMap.__len__c C s t t� j| j� �S rR )�iterry r� r� r� r r r �__iter__+ s zChainMap.__iter__c s t � fdd�| jD ��S )Nc 3 s | ]}� |v V qd S rR r )ri �m�rM r r rm / rn z(ChainMap.__contains__.<locals>.<genexpr>�rx r� r� r r� r � __contains__. s zChainMap.__contains__c C s t | j�S rR r� r� r r r �__bool__1 s zChainMap.__bool__c C s d� | d�tt| j���S )Nz{0.__class__.__name__}({1})rH )r� rA rL r; r� r� r r r �__repr__4 s �zChainMap.__repr__c G s | t j|g|�R � �S )z?Create a ChainMap with a single dict created from the iterable.)�dict�fromkeys)�cls�iterabler� r r r r� 9 s zChainMap.fromkeysc C s& | j | jd �� g| jdd� �R � S )zHNew ChainMap or subclass with a new copy of maps[0] and refs to maps[1:]r r' N)� __class__r� �copyr� r r r r� > s z ChainMap.copyc C s | j i g| j�R � S )z;New ChainMap with a new dict followed by all previous maps.�r� r� r� r r r � new_childD s zChainMap.new_childc C s | j | jdd� � S )zNew ChainMap from maps[1:].r' Nr� r� r r r �parentsH s zChainMap.parentsc C s || j d |< d S )Nr )r� )rV rM rN r r r � __setitem__M s zChainMap.__setitem__c C s6 z| j d |= W n ty0 td�|���Y n0 d S )Nr �(Key not found in the first mapping: {!r})r� r� r� r� r r r � __delitem__P s zChainMap.__delitem__c C s0 z| j d �� W S ty* td��Y n0 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� �popitemr� r� r r r r� V s zChainMap.popitemc G s@ z| j d j|g|�R � W S ty: td�|���Y n0 dS )zWRemove *key* from maps[0] and return its value. Raise KeyError if *key* not in maps[0].r r� N)r� �popr� r� )rV rM r� r r r r� ] s z ChainMap.popc C s | j d �� dS )z'Clear maps[0], leaving maps[1:] intact.r N)r� �clearr� r r r r� d s zChainMap.clear)N)r4 r5 r6 rY rX r� r� rJ r� r� r� r� r� r� � classmethodr� r� �__copy__r� �propertyr� r� r� r� r� r� r r r r r� s. r� )�cache_from_sourcec C s0 | � d�sJ �|d u rd}|r$d}nd}| | S )Nz.pyT�c�o)rg )r\ �debug_override�suffixr r r r� n s r� )� OrderedDict)r� )�KeysView� ValuesView� ItemsViewc @ s� e Zd ZdZdd� Zejfdd�Zejfdd�Zdd � Zd d � Z d d � Z d6dd�Z dd� Z dd� Z dd� Zdd� Zdd� Zdd � Zd d � ZeZe� Zefd d �Zd7d"d#�Zd8d$d%�Zd&d'� Zd(d)� Zed9d*d+��Z d,d-� Z d.d/� Z d0d1� Z d2d3� Z d4d5� Z!d!S ):r z)Dictionary that remembers insertion orderc O sp t |�dkr tdt |� ��z | j W n4 tyZ g | _}||dg|dd�< i | _Y n0 | j|i |�� dS )z�Initialize an ordered dictionary. Signature is the same as for regular dictionaries, but keyword arguments are not recommended because their insertion order is arbitrary. r' z$expected at most 1 arguments, got %dN)rK r� �_OrderedDict__rootr� �_OrderedDict__map�_OrderedDict__update)rV r� �kwds�rootr r r rX � s zOrderedDict.__init__c C sF || vr6| j }|d }|||g |d< |d< | j|< || ||� dS )z!od.__setitem__(i, y) <==> od[i]=yr r' N)r r )rV rM rN Z dict_setitemr �lastr r r r� � s zOrderedDict.__setitem__c C s0 || |� | j �|�\}}}||d< ||d< dS )z od.__delitem__(y) <==> del od[y]r' r N)r r� )rV rM Z dict_delitem� link_prev� link_nextr r r r� � s zOrderedDict.__delitem__c c s. | j }|d }||ur*|d V |d }qdS )zod.__iter__() <==> iter(od)r' r( N�r �rV r Zcurrr r r r� � s zOrderedDict.__iter__c c s. | j }|d }||ur*|d V |d }qdS )z#od.__reversed__() <==> reversed(od)r r( Nr r r r r � __reversed__� s zOrderedDict.__reversed__c C sb z@| j �� D ]}|dd�= q | j}||dg|dd�< | j �� W n tyR Y n0 t�| � dS )z.od.clear() -> None. Remove all items from od.N)r � itervaluesr r� r� r� )rV Znoder r r r r� � s zOrderedDict.clearTc C s| | s t d��| j}|r8|d }|d }||d< ||d< n |d }|d }||d< ||d< |d }| j|= t�| |�}||fS )z�od.popitem() -> (k, v), return and remove a (key, value) pair. Pairs are returned in LIFO order if last is true or FIFO order if false. zdictionary is emptyr r' r( )r� r r r� r� )rV r r �linkr r rM rN r r r r� � s zOrderedDict.popitemc C s t | �S )z od.keys() -> list of keys in od)r� r� r r r �keys� s zOrderedDict.keysc s � fdd�� D �S )z#od.values() -> list of values in odc s g | ] }� | �qS r r �ri rM r� r r ro � rn z&OrderedDict.values.<locals>.<listcomp>r r� r r� r �values� s zOrderedDict.valuesc s � fdd�� D �S )z.od.items() -> list of (key, value) pairs in odc s g | ]}|� | f�qS r r r r� r r ro � rn z%OrderedDict.items.<locals>.<listcomp>r r� r r� r �items� s zOrderedDict.itemsc C s t | �S )z0od.iterkeys() -> an iterator over the keys in od)r� r� r r r �iterkeys� s zOrderedDict.iterkeysc c s | D ]}| | V qdS )z2od.itervalues -> an iterator over the values in odNr �rV �kr r r r � s zOrderedDict.itervaluesc c s | D ]}|| | fV qdS )z=od.iteritems -> an iterator over the (key, value) items in odNr r r r r � iteritems s zOrderedDict.iteritemsc O s� t | �dkr tdt | �f ��n | s,td��| d }d}t | �dkrL| d }t|t�rn|D ]}|| ||< qZn<t|d�r�|�� D ]}|| ||< q�n|D ]\}}|||< q�|�� D ]\}}|||< q�dS ) a� od.update(E, **F) -> None. Update od from dict/iterable E and F. If E is a dict instance, does: for k in E: od[k] = E[k] If E has a .keys() method, does: for k in E.keys(): od[k] = E[k] Or if E is an iterable of items, does: for k, v in E: od[k] = v In either case, this is followed by: for k, v in F.items(): od[k] = v r( z8update() takes at most 2 positional arguments (%d given)z,update() takes at least 1 argument (0 given)r r r' r N)rK r� r r� �hasattrr r )r� r rV �otherrM rN r r r rU s( � zOrderedDict.updatec C s0 || v r| | }| |= |S || j u r,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__markerr� )rV rM r� r� r r r r� * s zOrderedDict.popNc C s || v r| | S || |< |S )zDod.setdefault(k[,d]) -> od.get(k,d), also set od[k]=d if k not in odr r� r r r � setdefault7 s zOrderedDict.setdefaultc C sn |si }t | �t� f}||v r"dS d||< z6| sFd| jjf W ||= S d| jj| �� f W ||= S ||= 0 dS )zod.__repr__() <==> repr(od)r� r' z%s()z%s(%r)N)r� � _get_identr� r4 r )rV Z _repr_runningZcall_keyr r r r� > s ��zOrderedDict.__repr__c sX � fdd�� D �}t � ��� }t t� �D ]}|�|d� q(|rL� j|f|fS � j|ffS )z%Return state information for picklingc s g | ]}|� | g�qS r r �ri r r� r r ro N rn z*OrderedDict.__reduce__.<locals>.<listcomp>N)�varsr� r r� r� )rV r Z inst_dictr r r� r � __reduce__L s zOrderedDict.__reduce__c C s | � | �S )z!od.copy() -> a shallow copy of od)r� r� r r r r� V s zOrderedDict.copyc C s | � }|D ] }|||< q |S )z�OD.fromkeys(S[, v]) -> New ordered dictionary with keys from S and values equal to v (which defaults to None). r )r� r� rN �drM r r r r� Z s zOrderedDict.fromkeysc C s6 t |t�r*t| �t|�ko(| �� |�� kS t�| |�S )z�od.__eq__(y) <==> od==y. 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