U f/e)@sdZddlmZddlmZddlmZddlZddl Z ddl Z ddl m Z ddl mZddZe jjd d Zd d Ze jjd dZdS)zd Tests multithreading behaviour for reading and parsing files for each parser defined in parsers.py ) ExitStack)BytesIO) ThreadPoolN) DataFramecCs\ttj|dtdd}d|d<d|d<d|d<tjd|dd |d <tj|d d |d <|S)z Construct a DataFrame for testing. Parameters ---------- num_rows : int The number of rows for our DataFrame. Returns ------- df : DataFrame Zabcde)columnsZfoobarZbazz20000101 09:00:00s)ZperiodsfreqdateZint64)Zdtypeint)rnprandomZrandlistpdZ date_rangeZarange)num_rowsdfrL/tmp/pip-unpacked-wheel-tiezk1ph/pandas/tests/io/parser/test_multi_thread.py_construct_dataframes rc s|}dd}fddt|D}tRfdd|D}td}||j|}|d}|D]}t||qdW5QRXdS)Ni'dcs(g|] }dddtDqS) css(|] }|dd|dd|dVqdS)d,Nr.0irrr /szBtest_multi_thread_string_io_read_csv...)joinrangeencode)r_) max_row_rangerr .sz8test_multi_thread_string_io_read_csv..csg|]}t|qSr) enter_contextr)rb)stackrrr#5sr)rrr$rmapread_csvtmassert_frame_equal) all_parsersparserZ num_filesZ bytes_to_dffilespoolresultsZ first_resultresultr)r"r&r$test_multi_thread_string_io_read_csv's r2c sxfdd}fddtD}td}|||}W5QRX|dj}|ddD] } || _q^t|} | S) a Generate a DataFrame via multi-thread. Parameters ---------- parser : BaseParser The parser object to use for reading the data. path : str The location of the CSV file to read. num_rows : int The number of rows to read per task. num_tasks : int The number of tasks to use for reading this DataFrame. Returns ------- df : DataFrame csB|\}}|s"jdd|dgdSjddt|d|dgdS)aj Create a reader for part of the CSV. Parameters ---------- arg : tuple A tuple of the following: * start : int The starting row to start for parsing CSV * nrows : int The number of rows to read. Returns ------- df : DataFrame rr ) index_colheadernrows parse_datesN )r3r4Zskiprowsr5r6)r)r )argstartr5)r-pathrrreaderTs" z0_generate_multi_thread_dataframe..readercs g|]}|fqSrrr)r num_tasksrrr#vsz4_generate_multi_thread_dataframe..)Z processesrr7N)rrr(rrconcat) r-r;rr=r<Ztasksr/r0r4rfinal_dataframer)rr=r-r;r _generate_multi_thread_dataframe@s"    rAc CsVd}d}|}d}t|}t|*}||t||||}t||W5QRXdS)Niz__thread_pool_reader__.csv)rr*Z ensure_cleanZto_csvrAr+)r,r=rr- file_namerr;r@rrr)test_multi_thread_path_multipart_read_csvs  rD)__doc__ contextlibriorZmultiprocessing.poolrZnumpyr ZpytestZpandasrrZpandas._testingZ_testingr*rmarkZslowr2rArDrrrrs      F