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Version: Python

Deephaven Python dtypes

Deephaven defines its Python types in the deephaven.dtypes package.

Importing deephaven.dtypes​

Deephaven recommends importing this package as follows:

import deephaven.dtypes as dht

Values​

The following values can be found in the deephaven.dtypes package:

dht.bool_
dht.byte
dht.short
dht.int16
dht.char
dht.int_
dht.int32
dht.long_
dht.int64
dht.float_
dht.single
dht.float32
dht.double
dht.float64
dht.string
dht.bigdecimal
dht.stringset
dht.datetime
dht.timeperiod
dht.byte_array
dht.short_array
dht.int16_array
dht.int_array
dht.int32_array
dht.long_array
dht.int64_array
dht.float_array
dht.single_array
dht.float32_array
dht.double_array
dht.float64_array
dht.string_array

Example usage​

One application of Deephaven types is to set the column types for a Dynamic Table Writer. The following example sets the "Key" column as a String, and the "Value" column as an integer in the dynamic table.

from deephaven import DynamicTableWriter
import deephaven.dtypes as dht

import threading
import time

dynamic_table_writer_columns = {
    "Key": dht.string,
    "Value": dht.int_
}

table_writer = DynamicTableWriter(dynamic_table_writer_columns)

table = table_writer.table

def thread_func():
    for i in range(10):
        table_writer.write_row(str(i), i)
        time.sleep(2)

thread = threading.Thread(target=thread_func)
thread.start()