# Basic imports
import os
from os import path
from os.path import join, exists

# Aliased imports
import numpy as np
import pandas as pd

# Conditional imports
try:
    import ujson as json
except ImportError:
    import json

# Lazy imports
def heavy_import():
    import tensorflow as tf
    return tf

# __init__.py
from .module1 import Class1
from .module2 import function1

__all__ = ['Class1', 'function1']
__version__ = '1.0.0'

# Singleton module
class _Singleton:
    _instance = None
    
    def __new__(cls):
        if cls._instance is None:
            cls._instance = super().__new__(cls)
        return cls._instance

singleton = _Singleton()

# Module-level constants
MAX_RETRIES = 3
DEFAULT_TIMEOUT = 30
API_VERSION = "v1"

# Module functions
def get_config():
    return {
        "max_retries": MAX_RETRIES,
        "timeout": DEFAULT_TIMEOUT
    }