Your IP : 216.73.217.13
f
�h ? � @ s� d Z d d l Z d d l m Z m Z m Z m Z m Z m Z m Z m
Z
m Z m Z m
Z
m Z m Z m Z d d l m Z d d l m Z d d d d d
d d d
d d d d d d d d d d d d g Z Gd d � d � Z Gd d
� d
e � Z e d
e � Gd d � d e � Z e d e � Gd d � d e � Z e d e � Gd! d � d � Z Gd" d � d � Z y e Wn e k
r�e Z Yn XGd# d � d � Z d S)$z+
csv.py - read/write/investigate CSV files
� N)�Error� __version__�writer�reader�register_dialect�unregister_dialect� get_dialect�
list_dialects�field_size_limit�
QUOTE_MINIMAL� QUOTE_ALL�QUOTE_NONNUMERIC�
QUOTE_NONE�__doc__)�Dialect)�StringIOr r r
r r r r �excel� excel_tabr
r r r r r �Snifferr r �
DictReader�
DictWriterc @ sd e Z d Z d Z d Z d Z d Z d Z d Z d Z d Z
d Z d Z d d � Z
d d � Z d S) r z�Describe a CSV dialect.
This must be subclassed (see csv.excel). Valid attributes are:
delimiter, quotechar, escapechar, doublequote, skipinitialspace,
lineterminator, quoting.
� FNc C s& | j t k r d | _ | j � d S)NT)� __class__r �_valid� _validate)�self� r �/usr/lib/python3.5/csv.py�__init__) s zDialect.__init__c C sL y t | � Wn7 t k
rG } z t t | � � � WYd d } ~ Xn Xd S)N)�_Dialect� TypeErrorr �str)r �er r r r . s zDialect._validate)�__name__�
__module__� __qualname__r �_namer � delimiter� quotecharZ
escapechar� doublequote�skipinitialspace�lineterminator�quotingr r r r r r r s c @ s: e Z d Z d Z d Z d Z d Z d Z d Z e Z
d S)r z;Describe the usual properties of Excel-generated CSV files.�,�"TFz
N) r# r$ r% r r' r( r) r* r+ r r, r r r r r 5 s c @ s e Z d Z d Z d Z d S)r zEDescribe the usual properties of Excel-generated TAB-delimited files.� N)r# r$ r% r r' r r r r r ? s z excel-tabc @ s: e Z d Z d Z d Z d Z d Z d Z d Z e Z
d S)� unix_dialectz:Describe the usual properties of Unix-generated CSV files.r- r. TF�
N) r# r$ r% r r' r( r) r* r+ r r, r r r r r0 D s r0 Zunixc @ sg e Z d Z d d d d d d � Z d d � Z e d d � � Z e j d d � � Z d
d � Z d S) r Nr c O sI | | _ | | _ | | _ t | | | | � | _ | | _ d | _ d S)Nr )� _fieldnames�restkey�restvalr �dialect�line_num)r �f�
fieldnamesr3 r4 r5 �args�kwdsr r r r P s zDictReader.__init__c C s | S)Nr )r r r r �__iter__Y s zDictReader.__iter__c C sP | j d k r: y t | j � | _ Wn t k
r9 Yn X| j j | _ | j S)N)r2 �nextr �
StopIterationr6 )r r r r r8 \ s
zDictReader.fieldnamesc C s
| | _ d S)N)r2 )r �valuer r r r8 f s c C s� | j d k r | j t | j � } | j j | _ x | g k rU t | j � } q7 Wt t | j | � � } t | j � } t | � } | | k r� | | d � | | j <n7 | | k r� x( | j | d � D] } | j | | <q� W| S)Nr ) r6 r8 r< r �dict�zip�lenr3 r4 )r �row�dZlfZlr�keyr r r �__next__j s zDictReader.__next__) r# r$ r% r r; �propertyr8 �setterrE r r r r r O s
c @ sU e Z d Z d d d d d � Z d d � Z d d � Z d
d � Z d d
� Z d S)r r �raiser c O sY | | _ | | _ | j � d k r4 t d | � � | | _ t | | | | � | _ d S)NrH �ignorez-extrasaction (%s) must be 'raise' or 'ignore')zraisezignore)r8 r4 �lower�
ValueError� extrasactionr )r r7 r8 r4 rL r5 r9 r: r r r r � s
zDictWriter.__init__c C s, t t | j | j � � } | j | � d S)N)r? r@ r8 �writerow)r �headerr r r � writeheader� s zDictWriter.writeheaderc sq � j d k rT � f d d � � D� } | rT t d d j d d � | D� � � � � � f d d � � j D� S) NrH c s% g | ] } | � j k r | � q Sr )r8 )�.0�k)r r r �
<listcomp>� s z,DictWriter._dict_to_list.<locals>.<listcomp>z(dict contains fields not in fieldnames: z, c S s g | ] } t | � � q Sr )�repr)rP �xr r r rR � s c 3 s$ | ] } � j | � j � Vq d S)N)�getr4 )rP rD )�rowdictr r r � <genexpr>� s z+DictWriter._dict_to_list.<locals>.<genexpr>)rL rK �joinr8 )r rV Z wrong_fieldsr )rV r r �
_dict_to_list� s zDictWriter._dict_to_listc C s | j j | j | � � S)N)r rM rY )r rV r r r rM � s zDictWriter.writerowc C s | j j t | j | � � S)N)r � writerows�maprY )r Zrowdictsr r r rZ � s zDictWriter.writerowsN)r# r$ r% r rO rY rM rZ r r r r r � s c @ sU e Z d Z d Z d d � Z d d d � Z d d � Z d d
� Z d d � Z d S)
r ze
"Sniffs" the format of a CSV file (i.e. delimiter, quotechar)
Returns a Dialect object.
c C s d d d d d g | _ d S)Nr- r/ �;� �:)� preferred)r r r r r � s zSniffer.__init__Nc C s� | j | | � \ } } } } | s< | j | | � \ } } | sN t d � � Gd d � d t � } | | _ | | _ | p d | _ | | _ | S)zI
Returns a dialect (or None) corresponding to the sample
z Could not determine delimiterc @ s" e Z d Z d Z d Z e Z d S)z Sniffer.sniff.<locals>.dialectZsniffedz
N)r# r$ r% r& r+ r r, r r r r r5 � s r5 r. )�_guess_quote_and_delimiter�_guess_delimiterr r r) r' r( r* )r �sample�
delimitersr( r) r' r* r5 r r r �sniff� s z
Sniffer.sniffc C s g } x@ d D]8 } t j | t j t j B� } | j | � } | r
Pq
W| sS d Si } i } d } | j } x� | D]� }
| d d
} |
| } | r� | j | d � d
| | <y | d d
} |
| } Wn t k
r� wu Yn X| r | d k s| | k r | j | d � d
| | <y | d d
} Wn t k
rHwu Yn X|
| ru | d
7} qu Wt | d
| j �}
| r�t | d
| j �} | | | k } | d k r�d } n d } d } t j d d t j | � d |
i t j � } | j
| � rd } n d } |
| | | f S)a�
Looks for text enclosed between two identical quotes
(the probable quotechar) which are preceded and followed
by the same character (the probable delimiter).
For example:
,'some text',
The quote with the most wins, same with the delimiter.
If there is no quotechar the delimiter can't be determined
this way.
�F(?P<delim>[^\w
"'])(?P<space> ?)(?P<quote>["']).*?(?P=quote)(?P=delim)�C(?:^|
)(?P<quote>["']).*?(?P=quote)(?P<delim>[^\w
"'])(?P<space> ?)�D(?P<delim>>[^\w
"'])(?P<space> ?)(?P<quote>["']).*?(?P=quote)(?:$|
)�*(?:^|
)(?P<quote>["']).*?(?P=quote)(?:$|
)r FNr Zquote� �delimZspacerD r1 z]((%(delim)s)|^)\W*%(quote)s[^%(delim)s\n]*%(quote)s[^%(delim)s\n]*%(quote)s\W*((%(delim)s)|$)T)re rf rg rh )r FNr ) �re�compile�DOTALL� MULTILINE�findall�
groupindexrU �KeyError�max�escape�search)r �datarc ZmatchesZrestrZregexpZquotes�delimsZspacesrp �m�nrD r( rj r* Z dq_regexpr) r r r r` � s`
% z"Sniffer._guess_quote_and_delimiterc C s� t t d | j d � � � } d d � t d � D� } t d t | � � } d } i } i } i } d t | t | � � } }
x�| t | � k r | d 7} xn | | |
� D]\ } xS | D]K } | j | i � }
| j | � } |
j | d � d |
| <|
| | <q� Wq� Wx� | j � D]� } t | | j � � } t | � d k rb| d d d k rbq t | � d k r�t
| d d
d � �| | <| j | | � | | d | | d t d d
� | D� � f | | <q | d | | <q W| j � } t
| | � } d } d } x� t | � d k r�| | k r�xj | D]b \ } } | d d k r=| d d k r=| d | | k r=| d k s�| | k r=| | | <q=W| d 8} qWt | � d k r
t | j � � d } | d j | � | d j d | � k } | | f S|
} |
| 7}
q� W| s+d St | � d k r�xW | j D]L } | | j � k rG| d j | � | d j d | � k } | | f SqGWd d � | j � D� } | j � | d d } | d j | � | d j d | � k } | | f S)a�
The delimiter /should/ occur the same number of times on
each row. However, due to malformed data, it may not. We don't want
an all or nothing approach, so we allow for small variations in this
number.
1) build a table of the frequency of each character on every line.
2) build a table of frequencies of this frequency (meta-frequency?),
e.g. 'x occurred 5 times in 10 rows, 6 times in 1000 rows,
7 times in 2 rows'
3) use the mode of the meta-frequency to determine the /expected/
frequency for that character
4) find out how often the character actually meets that goal
5) the character that best meets its goal is the delimiter
For performance reasons, the data is evaluated in chunks, so it can
try and evaluate the smallest portion of the data possible, evaluating
additional chunks as necessary.
Nr1 c S s g | ] } t | � � q Sr )�chr)rP �cr r r rR , s z,Sniffer._guess_delimiter.<locals>.<listcomp>� �
r ri rD c S s | d S)Nri r )rT r r r �<lambda>F s z*Sniffer._guess_delimiter.<locals>.<lambda>c s s | ] } | d Vq d S)ri Nr )rP �itemr r r rW K s z+Sniffer._guess_delimiter.<locals>.<genexpr>g �?g�������?g{�G�z�?z%c r c S s" g | ] \ } } | | f � q Sr r )rP rQ �vr r r rR u s )r r ���)�list�filter�split�range�minrA rU �count�keys�itemsrr �remove�sum�floatr_ �sort)r ru rc �asciiZ chunkLengthZ iterationZ
charFrequencyZmodesrv �start�end�line�charZ
metaFrequencyZfreqr� ZmodeListZtotalZ consistencyZ thresholdrQ r rj r* rC r r r ra st
& $ !
zSniffer._guess_delimiterc
C s� t t | � | j | � � } t | � } t | � } i } x t | � D] } d | | <qI Wd } x� | D]� } | d k r} P| d 7} t | � | k r� qj x� t | j � � D]� } xU t t t
g D]4 }
y |
| | � PWq� t t f k
r� Yq� Xq� Wt | | � }
|
| | k r� | | d k r:|
| | <q� | | =q� Wqj Wd } x� | j
� D]� \ } } t | � t d � k r�t | | � | k r�| d 7} q�| d 8} q\y | | | � Wn" t t f k
r�| d 7} Yq\X| d 8} q\W| d k S)Nr � ri )r r rd r< rA r� r� r� �intr� �complexrK �
OverflowErrorr� �typer )
r rb ZrdrrN �columnsZ columnTypes�iZcheckedrB �colZthisTypeZ hasHeaderZcolTyper r r �
has_header~ sJ
zSniffer.has_header) r# r$ r% r r rd r` ra r� r r r r r � s L g) r rk Z_csvr r r r r r r r r
r r r
r r r �ior �__all__r r r0 r r r� � NameErrorr� r r r r r �<module> s. ^
2