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Character used to separate fields (the default is ',') Boolean flag that determines how the quote character (quotechar) is handled when it appears in a field If True, the character is simply doubled If False, an escape character (escapechar) is used as a prefix The default is True Character used as an escape character when the delimiter appears in a field and quoting is QUOTE_NONE The default value is None Line termination sequence ('\r\n' is the default) Character used to quote fields that contain the delimiter ('"' is the default) If True, whitespace immediately following the delimiter is ignored (False is the default)
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writer(csvfile [, dialect [, **fmtparam]])
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Returns a writer object that can be used to create a CSV file csvfile is any file-like object that supports a write() method dialect has the same meaning as for reader() and is used to handle differences between various CSV encodings fmtparams has the same meaning as for readers However, one additional keyword argument is available:
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Controls the quoting behavior of output data It s set to one of QUOTE_ALL (quotes all fields), QUOTE_MINIMAL (only quote fields that contain the delimiter or start with the quote character), QUOTE_NONNUMERIC (quote all nonnumeric fields), or QUOTE_NONE (never quote fields) The default value is QUOTE_MINIMAL
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A writer instance, w, supports the following methods:
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wwriterow(row)
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Writes a single row of data to the file row must be a sequence of strings or numbers
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wwriterows(rows)
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Writes multiple rows of data rows must be a sequence of rows as passed to the writerow() method
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DictReader(csvfile [, fieldnames [, restkey [, restval [, dialect [, **fmtparams]]]]])
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Returns a reader object that operates like the ordinary reader but returns dictionary objects instead of lists of strings when reading the file fieldnames provides a list of field names used as keys in the returned dictionary If omitted, the dictionary key names are taken from the first row of the input file restkey provides the name of a dictionary key that s used to store excess data for instance, if a row has more data fields than field names restval is a default value that s used as the value for fields that are missing from the input for instance, if a row does not have enough fieldsThe default value of restkey and restval is None dialect and fmtparams have the same meaning as for reader()
DictWriter(csvfile, fieldnames [, restval [, extrasaction [, dialect [, **fmtparams]]]])
Returns a writer object that operates like the ordinary writer but writes dictionaries into output rows fieldnames specifies the order and names of attributes that will be written to the file restval is the value that s written if the dictionary being written is missing one of the field names in fieldnames extrasaction is a string that specifies what to do if a dictionary being written has keys not listed in fieldnamesThe default value of extrasaction is 'raise', which raises a ValueError exception A value of 'ignore' may be used, in which case extra values in the dictionary are ignored dialect and fmtparams have the same meaning as with writer() A DictWriter instance, w, supports the following methods:
wwriterow(row)
Writes a single row of data to the file row must be a dictionary that maps field names to values
wwriterows(rows)
Writes multiple rows of data rows must be a sequence of rows as passed to the writerow() method
Sniffer()
Creates a Sniffer object that is used to try and automatically detect the format of a CSV file A Sniffer instance, s, has the following methods:
ssniff(sample [, delimiters])
Looks at data in sample and returns an appropriate Dialect object representing the data format sample is a portion of a CSV file containing at least one row of data delimiters, if supplied, is a string containing possible field delimiter characters
shas_header(sample)
Looks at the CSV data in sample and returns True if the first row looks like a collection of column headers
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Dialects
Many of the functions and methods in the csv module involve a special dialect parameterThe purpose of this parameter is to accommodate different formatting conventions of CSV files (for which there is no official standard format) for example, differences between comma-separated values and tab-delimited values, quoting conventions, and so forth Dialects are defined by inheriting from the class Dialect and defining the same set of attributes as the formatting parameters given to the reader() and writer() functions (delimiter, doublequote, escapechar, lineterminator, quotechar, quoting, skipinitialspace) The following utility functions are used to manage dialects:
register_dialect(name, dialect)