U +if@sdZddlmZddlmZddlmZddlZddl Z ddl Z ddl m Z ddl mZe jdZdd Ze jjd d Zd d Ze jjddZdS)zd Tests multithreading behaviour for reading and parsing files for each parser defined in parsers.py ) ExitStack)BytesIO) ThreadPoolN) DataFrameZ pyarrow_skipcCs\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_rowsdfr[/home/mars/bis/venv/lib/python3.8/site-packages/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&g|]}|dd|dd|dqS)d,r.0irrr 3szCtest_multi_thread_string_io_read_csv...)joinrangeencode)r_) max_row_rangerrr2sz8test_multi_thread_string_io_read_csv..csg|]}t|qSr) enter_contextr)rb)stackrrr9sr)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 r1c 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 )r2r3Zskiprowsr4r5)r(r )argstartr4)r,pathrrreaderXs" z0_generate_multi_thread_dataframe..readercs g|]}|fqSrrr)r num_tasksrrrzsz4_generate_multi_thread_dataframe..)Z processesrr6N)rrr'rrconcat) r,r:rr<r;tasksr.r/r3rfinal_dataframer)rr<r,r:r _generate_multi_thread_dataframeDs"    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.poolrnumpyr ZpytestZpandasrrZpandas._testingZ_testingr)markZ usefixturesZ pytestmarkrZslowr1rArDrrrrs       F