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improving df.to_csv performance#7147

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Commits on May 17, 2014

• adding small Writer class just for headerline.\nAdding new write_csv_rows_fast into lib.pyx that manages file open/close on its own with self.path_or_buf from CSVFormmatter.

  michaelaye

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Commits on May 22, 2014

• adding cdef class FastWriter, so that CSVFormatter only opens file once. Taking care of float, int and string dtypes.

  michaelaye

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  b02a564

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