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csv.py - read/write/investigate CSV files
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s Errors __version__s writers readers register_dialects unregister_dialects get_dialects
list_dialectss
QUOTE_MINIMALs QUOTE_ALLs QUOTE_NONNUMERICs
QUOTE_NONEs __doc__( s StringIOt
QUOTE_MINIMALt QUOTE_ALLt QUOTE_NONNUMERICt
QUOTE_NONEt Errort Dialectt excelt excel_tabt readert writert register_dialectt get_dialectt
list_dialectst Sniffert unregister_dialectt __version__t
DictReadert
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Ns( can't directly instantiate Dialect classs delimiter character not seti s& delimiter must be one-character strings quotechar not sets& quotechar must be one-character strings lineterminator not sets lineterminator must be a strings+ doublequote parameter must be True or Falses0 skipinitialspace parameter must be True or Falses quoting parameter not sets; escapechar must be a one-character string or unicode object( R R R t appendt delimitert Nonet
isinstancet strt lent quotechart quotingR t lineterminatort doublequoteR t Falset skipinitialspacet
escapechart unicode( R R ( ( R R ) s4
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( R* R+ R R R6 R7 ( ( ( R R ^ s c B s5 t Z d d d d „ Z d „ Z d „ Z d „ Z RS( NR t raiseR c O s[ | | _ | | _ | i ƒ d j o t d | ‚ n | | _ t | | | | Ž | _ d S( NR? t ignores- extrasaction (%s) must be 'raise' or 'ignore'( R? s ignore( R/ R R1 t extrasactiont lowert
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W| i i | ƒ S( N( t rowst rowdictsRD R R RI R t writerows( R RL RK RD ( ( R RM • s
( R* R+ R RI RJ RM ( ( ( R R s c B s> t Z d Z d „ Z e d „ Z d „ Z d „ Z d „ Z RS( se
"Sniffs" the format of a CSV file (i.e. delimiter, quotechar)
Returns a Dialect object.
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Returns a dialect (or None) corresponding to the sample
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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.
sF (?P<delim>[^\w
"'])(?P<space> ?)(?P<quote>["']).*?(?P=quote)(?P=delim)sC (?:^|
)(?P<quote>["']).*?(?P=quote)(?P<delim>[^\w
"'])(?P<space> ?)sD (?P<delim>>[^\w
"'])(?P<space> ?)(?P<quote>["']).*?(?P=quote)(?:$|
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)(?P<quote>["']).*?(?P=quote)(?:$|
)R i t quotei t delimt spacec C s | | | | j o | p | S( N( t quotest at b( R\ R] R[ ( ( R t <lambda>ô s c C s | | | | j o | p | S( N( t delimsR\ R] ( R\ R] R_ ( ( R R^ ø s s
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"'])(?P<space> ?)(?P<quote>["']).*?(?P=quote)(?P=delim)sC (?:^|
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)( R Ni ( t matchest restrt ret compilet DOTALLt MULTILINEt regexpt findallt dataR R[ R_ t spacest mt
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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 freqencies 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.
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