laziest-import 0.0.4.4

Automatic lazy import library - use common libraries without explicit import statements

laziest-import

A zero-configuration lazy import library. Import and use any installed module with a single line.

from laziest_import import *

arr = np.array([1, 2, 3])      # numpy
df = pd.DataFrame({'a': [1]})  # pandas
plt.plot([1, 2, 3])            # matplotlib

No import numpy as np, no import pandas as pd required.

Installation

pip install laziest-import

Quick Start

Show examples

Method 1: Wildcard import (recommended)

from laziest_import import *

# Common libraries work immediately
arr = np.array([1, 2, 3])           # numpy
df = pd.DataFrame({'a': [1, 2]})    # pandas
plt.plot([1, 2, 3]); plt.show()     # matplotlib

# Standard library
print(os.getcwd())                  # os
data = json.dumps({'key': 'value'}) # json

# Submodules load automatically
result = np.linalg.svd(matrix)      # numpy.linalg

Method 2: Namespace prefix

import laziest_import as lz

arr = lz.np.array([1, 2, 3])
df = lz.pd.DataFrame({'a': [1, 2]})

Method 3: Lazy proxy (with auto-correction)

from laziest_import import lazy

# Automatic typo correction
arr = lazy.nump.array([1, 2, 3])    # nump -> numpy ✅
df = lazy.pnda.DataFrame()          # pnda -> pandas ✅

# Submodule shortcuts
layer = lazy.nn.Linear(10, 5)       # nn -> torch.nn ✅

Key Features

Feature	Description
Modular architecture	Clean 10-module codebase for maintainability
Lazy loading	Modules import only on first access, reducing startup overhead
Lazy function loading	Symbol functions loaded on-demand for faster startup
Background index build	Symbol index builds in background thread
Symbol sharding	Large packages split into shards for faster access
Submodule support	np.linalg.svd() chains submodules automatically
Auto-discovery	Unregistered names search installed modules automatically
Typo correction	Misspelling auto-correction (nump → numpy, matplotlip → matplotlib)
Abbreviation expansion	300+ abbreviations (nn → torch.nn, F → torch.nn.functional)
Fuzzy matching	Typo correction via Levenshtein distance algorithm
Symbol location	lz.which() finds where symbols are defined
Auto-install	Optional: missing modules can be pip-installed automatically
Multi-level cache	Three-tier caching (stdlib/third-party/memory) for fast lookups
Cache persistence	Symbol index saved to disk with configurable TTL
Cache statistics	Track hits/misses and optimize performance
Version checking	Automatic compatibility warnings for aliases/mappings
Type hints support	LazySymbol.__class_getitem__ for generic type hints
Dependency pre-analysis	Scan code to predict required imports
Import profiler	Record module load times and memory usage
Environment detection	Detect virtual environments (venv/conda/virtualenv)
Conflict visualization	Find and display symbol conflicts across modules
Persistent preferences	Save/load user preferences to ~/.laziestrc
1000+ aliases	Predefined aliases for common packages
454+ tests	Comprehensive test coverage

What's New in v0.0.4

• Background Index Building: Symbol index builds in background thread, no blocking
• Lazy-loaded Functions: Reduced startup time by lazy-loading symbol functions
• Symbol Sharding: Large package symbols stored in shards for faster access
• Symbol Location Finder: lz.which() - find where symbols are defined
• Interactive Help: lz.help() - comprehensive help system with topics
• Jupyter Magics: %%lazy, %lazyimport, %lazylist, %lazysearch
• User Config File: ~/.laziestrc for persistent configuration
• Type Hints Support: LazySymbol.__class_getitem__ for generic type hints
• Dependency Pre-Analysis: Scan code to predict required imports
• Import Profiler: Record module load times and memory usage
• Environment Detection: Detect virtual environments (venv/conda/virtualenv)
• Conflict Visualization: Find and display symbol conflicts across modules
• Persistent Preferences: Save/load user preferences to ~/.laziestrc
• 454+ tests: Comprehensive test coverage

Auto-Install

When enabled, accessing an uninstalled module triggers automatic installation:

from laziest_import import *

# Enable auto-install with interactive confirmation
enable_auto_install()

# Use a mirror for faster downloads
enable_auto_install(index="https://pypi.org/simple")

# Now accessing uninstalled modules prompts for installation
arr = np.array([1, 2, 3])  # If numpy is missing, prompts to install

Auto-install API

Function	Description
enable_auto_install(interactive=True, index=None)	Enable auto-install
disable_auto_install()	Disable auto-install
is_auto_install_enabled()	Check status
install_package(name)	Manually install a package
set_pip_index(url)	Set mirror URL

Predefined Aliases

Show full list

Category	Aliases
Data Science	np, pd, plt, sns, scipy
Machine Learning	torch, tf, keras, sklearn, xgboost, lightgbm
Deep Learning	transformers, langchain, llama_index
Web Frameworks	flask, django, fastapi, starlette
HTTP Clients	requests, httpx, aiohttp
Databases	sqlalchemy, pymongo, redis, duckdb
Cloud Services	boto3 (AWS), google.cloud, azure
Image Processing	cv2, PIL.Image, skimage
GUI	PyQt6, tkinter, flet, nicegui
DevOps	docker, kubernetes, ansible
NLP	spacy, nltk, transformers
Visualization	plotly, bokeh, streamlit, gradio

Advanced Features

File-based cache

Cache imported modules for faster subsequent runs:

import laziest_import as lz

# View cache status
info = lz.get_file_cache_info()
# {'cache_size_bytes': 12345, 'cache_size_mb': 0.01, 'max_cache_size_mb': 100, ...}

# Set custom cache directory
lz.set_cache_dir('./my_cache')

# Clear cache
lz.clear_file_cache()

Cache configuration

import laziest_import as lz

# Get cache version
version = lz.get_cache_version()  # '0.0.2.3'

# Configure cache settings
lz.set_cache_config(
    symbol_index_ttl=3600,       # Symbol index TTL: 1 hour
    stdlib_cache_ttl=2592000,    # Stdlib cache TTL: 30 days
    max_cache_size_mb=200        # Max cache size: 200 MB
)

# Get cache statistics
stats = lz.get_cache_stats()
# {'symbol_hits': 10, 'symbol_misses': 2, 'module_hits': 5, 
#  'module_misses': 1, 'hit_rate': 0.875, ...}

# Reset statistics
lz.reset_cache_stats()

# Invalidate cache for a specific package (after upgrade)
lz.invalidate_package_cache('numpy')

# Rebuild symbol index
lz.rebuild_symbol_index()

Debug and statistics

import laziest_import as lz

# Enable debug mode
lz.enable_debug_mode()

# Get import statistics
stats = lz.get_import_stats()
# {'total_imports': 3, 'total_time': 0.15, 'module_times': {...}}

# Reset statistics
lz.reset_import_stats()

Import hooks

import laziest_import as lz

def before_import(module_name):
    print(f"About to import: {module_name}")

def after_import(module_name, module):
    print(f"Imported: {module_name}")

lz.add_pre_import_hook(before_import)
lz.add_post_import_hook(after_import)

Async import

import laziest_import as lz
import asyncio

async def main():
    # Import multiple modules in parallel
    modules = await lz.import_multiple_async(['numpy', 'pandas', 'torch'])
    np, pd = modules['numpy'], modules['pandas']

asyncio.run(main())

Symbol Location Finder

import laziest_import as lz

# Find where a symbol is defined
loc = lz.which('sqrt')
print(loc)  # numpy.sqrt

# Find in a specific module
loc = lz.which('DataFrame', 'pandas')

# Find all locations
locs = lz.which_all('sqrt')
for loc in locs:
    print(f"{loc.module_name}.{loc.symbol_name}")

Interactive Help

import laziest_import as lz

# General help
print(lz.help())

# Specific topics
print(lz.help('quickstart'))
print(lz.help('which'))
print(lz.help('jupyter'))

Jupyter/IPython Magics

# Load the extension
%load_ext laziest_import

# Import modules lazily in current session
%lazyimport numpy pandas

# List available modules
%lazylist

# Search for symbols
%lazysearch sqrt
%lazysearch DataFrame

# Cell magic for lazy import
%%lazy -m numpy
arr = np.array([1, 2, 3])

User Configuration

import laziest_import as lz

# Create default config file
lz.create_rc_file()

# Load config
config = lz.load_rc_config()

# Get specific value
value = lz.get_rc_value('debug', default=False)

# Config info
info = lz.get_rc_info()

Custom aliases

from laziest_import import *

# Register a single alias
register_alias("mylib", "my_awesome_library")

# Register multiple aliases
register_aliases({
    "api": "my_api_client",
    "db": "my_database_lib",
})

Dependency Pre-Analysis

Scan Python code to predict required imports before execution:

import laziest_import as lz

# Analyze a file
result = lz.analyze_file('my_script.py')
print(result.predicted_imports)  # {'numpy', 'pandas', ...}

# Analyze source code directly
code = '''
import numpy as np
import pandas as pd
'''
result = lz.analyze_source(code)
print(result.used_symbols)  # {'np', 'pd'}

# Analyze a directory
results = lz.analyze_directory('./src', recursive=True)
for r in results:
    print(f"{r.file_path}: {r.predicted_imports}")

Import Profiler

Record module load times and memory usage:

import laziest_import as lz

# Start profiling
lz.start_profiling()

# Your code here
import numpy as np
import pandas as pd

# Stop profiling
lz.stop_profiling()

# Get report
report = lz.get_profile_report()
for name, profile in report.modules.items():
    print(f"{name}: {profile.load_time_ms:.2f}ms, {profile.memory_kb:.1f}KB")

# Print formatted report
lz.print_profile_report()

Environment Detection

Detect the current Python environment:

import laziest_import as lz

# Get environment info
env = lz.detect_environment()
print(f"Python: {env.python_version}")
print(f"Executable: {env.executable}")
print(f"Virtual env: {env.virtual_env}")
print(f"Venv type: {env.venv_type}")  # 'venv', 'conda', 'virtualenv', None
print(f"Site packages: {env.site_packages}")

# Show formatted info
lz.show_environment()

Conflict Visualization

Find symbols that exist in multiple modules:

import laziest_import as lz

# Find all symbol conflicts
conflicts = lz.find_symbol_conflicts()
for symbol, conflict in conflicts.items():
    print(f"{symbol}: {conflict.modules}")

# Show formatted table
lz.show_conflicts()

# Get summary
summary = lz.get_conflicts_summary()
print(f"Total conflicts: {summary['total_conflicts']}")

Persistent Preferences

Save and load user preferences:

import laziest_import as lz

# Set symbol preference
lz.set_symbol_preference('DataFrame', 'pandas')
lz.set_symbol_preference('sqrt', 'math')

# Save to ~/.laziestrc
lz.save_preferences()

# Load preferences
prefs = lz.load_preferences()

# Apply loaded preferences
lz.apply_preferences(prefs)

# Clear preferences
lz.clear_preferences()

API Reference

Show full API

Alias Management

Function	Description
register_alias(alias, module_name)	Register an alias
register_aliases(dict)	Register multiple aliases
unregister_alias(alias)	Remove an alias
list_loaded()	List loaded modules
list_available()	List all available aliases
get_module(alias)	Get module object
clear_cache()	Clear cache

Auto-Search

Function	Description
enable_auto_search()	Enable auto-discovery
disable_auto_search()	Disable auto-discovery
search_module(name)	Search for a module
search_class(class_name)	Search by class name
rebuild_module_cache()	Rebuild cache

Symbol Search

Function	Description
enable_symbol_search()	Enable symbol search
search_symbol(name)	Search for classes/functions
rebuild_symbol_index()	Rebuild index

Auto-Install

Function	Description
enable_auto_install()	Enable auto-install
disable_auto_install()	Disable auto-install
install_package(name)	Install manually
set_pip_index(url)	Set mirror URL

Other

Function	Description
get_version(alias)	Get module version
reload_module(alias)	Reload a module
enable_retry()	Enable retry mechanism
enable_file_cache()	Enable file cache

Cache Management

Function	Description
get_cache_version()	Get cache version
set_cache_config(...)	Configure cache settings
get_cache_config()	Get cache configuration
get_cache_stats()	Get cache statistics
reset_cache_stats()	Reset cache statistics
invalidate_package_cache(pkg)	Invalidate package cache
get_file_cache_info()	Get file cache info
clear_file_cache()	Clear file cache
set_cache_dir(path)	Set cache directory

Analysis & Profiling

Function	Description
analyze_file(path)	Analyze Python file for imports
analyze_source(code)	Analyze source code string
analyze_directory(path)	Analyze all files in directory
start_profiling()	Start import profiler
stop_profiling()	Stop import profiler
get_profile_report()	Get profiling report
print_profile_report()	Print formatted report

Environment Detection

Function	Description
detect_environment()	Detect Python environment
show_environment()	Display environment info

Conflict Detection

Function	Description
find_symbol_conflicts()	Find symbol conflicts
show_conflicts()	Display conflicts table
get_conflicts_summary()	Get conflicts summary

Preferences

Function	Description
save_preferences()	Save preferences to file
load_preferences()	Load preferences from file
apply_preferences(prefs)	Apply loaded preferences
clear_preferences()	Clear saved preferences

Configuration

Custom aliases can be configured in:

1. ~/.laziest_import/aliases/A.json, B.json, ... (user global, letter-based)
2. ./.laziest_import/A.json, B.json, ... (project level)

// ~/.laziest_import/aliases/M.json
{
    "mylib": "my_awesome_library",
    "mpl": "matplotlib"
}

Letter-based files load faster - only the relevant file is loaded on demand.

JSON Mappings

All mappings are stored in laziest_import/mappings/ directory:

File	Description
abbreviations.json	Module abbreviations (np → numpy)
misspellings.json	Common misspellings (numpi → numpy)
submodules.json	Submodule shortcuts (nn → torch.nn)
package_rename.json	Package rename mappings (sklearn → scikit-learn)
symbol_misspellings.json	Symbol misspellings (dataframe → DataFrame)
priorities.json	Module priorities for conflict resolution

Version Management

Version compatibility is managed centrally in version.json:

{
    "_current_version": "0.0.3.1",
    "_cache_version": "0.0.3.1",
    "aliases": {
        "_min_version": "0.0.3",
        "_max_version": "0.0.4"
    },
    "mappings": {
        "_min_version": "0.0.3",
        "_max_version": "0.0.4"
    }
}

If the current version is outside the specified range, a warning is issued:

UserWarning: [laziest-import] aliases: Version 0.0.4 is at or above maximum 0.0.4. 
Some alias features may not work correctly.

Troubleshooting

Common Issues

Q: Module not found (AttributeError)

AttributeError: module 'laziest_import' has no attribute 'mymodule'

Solution: The module is not registered. Use lz.enable_auto_search() to enable auto-discovery, or register it manually:

lz.register_alias('mymodule', 'mypackage.mymodule')

Q: Slow first import The symbol index may be building. Check status with:

lz.is_index_building()  # True if building
lz.wait_for_index(30)  # Wait up to 30 seconds

Enable background build to avoid blocking:

lz.enable_background_build()

Q: Typo correction not working Ensure the module is in the alias list:

lz.register_alias('nump', 'numpy')  # Add misspelling
arr = lz.nump.array([1, 2, 3])  # Now works

Q: Symbol conflicts (same name in multiple modules) Use module hints or preferences:

lz.set_symbol_preference('DataFrame', 'pandas')  # Prefer pandas
result = lz.DataFrame  # Gets pandas.DataFrame

Debug Mode

Enable detailed logging:

lz.enable_debug_mode()
import laziest_import as lz
arr = lz.np.array([1, 2, 3])  # See import details in logs

Cache Issues

Clear caches if experiencing stale data:

lz.clear_cache()       # Clear memory cache
lz.clear_file_cache()  # Clear disk cache
lz.rebuild_symbol_index()  # Rebuild symbol index

Performance Tips

1. First run: ~2s to build index
2. Cached run: ~0.003s (700x faster!)
3. Use lz.enable_background_build() to avoid blocking on first import
4. For CI/CD, set LAZY_BG_BUILD=1 to pre-build cache

How It Works

1. Proxy objects: Each alias maps to a LazyModule proxy
2. On-demand import: Real import triggers on first attribute access via __getattr__
3. Caching: Imported modules cache within the proxy object
4. Chain proxies: LazySubmodule handles recursive lazy loading
5. Fuzzy search: Levenshtein distance algorithm for fault-tolerant matching

Multi-Level Cache Architecture

The library uses a three-tier caching system for optimal performance:

Cache Level	Description	Default TTL
Stdlib cache	Standard library symbols	7 days
Third-party cache	Installed package symbols	24 hours
Memory cache	Hot cache for current session	Session

Cache files are stored in ~/.laziest_import/cache/ and automatically:

• Expire based on TTL settings
• Clean up when exceeding size limit (default: 100 MB)
• Invalidate on Python version changes

Requirements

• Python 3.8+

License

MIT