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My Deephaven Library

A library-only package providing reusable Deephaven query functions. This package contains no CLI tools - it's designed to be imported and used as a library in other Python projects.

Installation

pip install .

Or in editable mode for development:

pip install -e .

Usage

Note

All Deephaven functionality requires a running server. Start the server before importing Deephaven modules.

Import and use the library functions in your Python code:

# Start the Deephaven server
from deephaven_server import Server
server = Server(port=10000, jvm_args=["-Xmx4g"])
server.start()

# Now use the library functions
from my_dh_library.queries import filter_by_threshold, add_computed_columns
from deephaven import read_csv

data = read_csv("data.csv")
filtered = filter_by_threshold(data, "Score", 75.0)
enhanced = add_computed_columns(filtered)

Available Functions

Query Functions (my_dh_library.queries)

  • filter_by_threshold(table, column, threshold) - Filter table rows where column value exceeds threshold
  • add_computed_columns(table) - Add commonly used computed columns to a table
  • summarize_by_group(table, group_col, value_col) - Create summary statistics grouped by a column

Utility Functions (my_dh_library.utils)

  • validate_columns(table, required_columns) - Check if table has all required columns
  • get_table_info(table) - Get basic information about a table

Requirements

  • Python 3.8 or later
  • Deephaven Server 0.35.0 or later