tidy up parquet from lib

parquet/pyarrow_arm/pyarrow_test.py

@@ -0,0 +1,18 @@
+
+import pyarrow.parquet as pq
+import pyarrow.csv as pv
+
+csvfile = 'pressureVacuum.csv'
+
+tb = pv.read_csv(csvfile,parse_options=pv.ParseOptions(delimiter=','))
+
+print(tb)
+
+parquetfile = 'pressureVacuum.parquet'
+
+pq.write_table(tb,parquetfile,compression='BROTLI')
+#  {'NONE', 'SNAPPY', 'GZIP', 'LZO', 'BROTLI', 'LZ4', 'ZSTD'}
+
+df = pq.read_table(parquetfile,columns=None)
+
+print(df)