dependency-analyzer

Dependency Analyzer

Analyze Python file imports and project dependencies.

Features

• Import Extraction: List all imports from Python files
• Dependency Graph: Visualize import relationships
• Unused Detection: Find unused imports
• Requirements Generation: Auto-generate requirements.txt
• Standard Library Detection: Separate stdlib from third-party
• Circular Import Detection: Find circular dependencies

Quick Start

from dependency_analyzer import DependencyAnalyzer

analyzer = DependencyAnalyzer()

# Analyze single file
imports = analyzer.analyze_file("main.py")
print(imports)

# Analyze project
result = analyzer.analyze_project("./src")
print(result['third_party'])  # External dependencies

CLI Usage

# Analyze single file
python dependency_analyzer.py --file main.py

# Analyze project directory
python dependency_analyzer.py --dir ./src

# Generate requirements.txt
python dependency_analyzer.py --dir ./src --requirements --output requirements.txt

# Find unused imports
python dependency_analyzer.py --file main.py --unused

# Show dependency graph
python dependency_analyzer.py --dir ./src --graph

# JSON output
python dependency_analyzer.py --dir ./src --json

API Reference

DependencyAnalyzer Class

class DependencyAnalyzer:
    def __init__(self)

    # Analysis
    def analyze_file(self, filepath: str) -> dict
    def analyze_project(self, directory: str) -> dict

    # Detection
    def find_unused_imports(self, filepath: str) -> list
    def find_circular_imports(self, directory: str) -> list

    # Generation
    def generate_requirements(self, directory: str) -> list
    def save_requirements(self, deps: list, output: str)

    # Classification
    def is_stdlib(self, module: str) -> bool
    def is_local(self, module: str, directory: str) -> bool

Output Format

File Analysis

{
    "file": "main.py",
    "imports": [
        {"module": "os", "type": "stdlib", "line": 1},
        {"module": "json", "type": "stdlib", "line": 2},
        {"module": "requests", "type": "third_party", "line": 3},
        {"module": "utils.helpers", "type": "local", "line": 4}
    ],
    "from_imports": [
        {"module": "typing", "names": ["Dict", "List"], "type": "stdlib"},
        {"module": "flask", "names": ["Flask", "request"], "type": "third_party"}
    ]
}

Project Analysis

{
    "directory": "./src",
    "files_analyzed": 15,
    "stdlib": ["os", "sys", "json", "typing", ...],
    "third_party": ["requests", "flask", "pandas", ...],
    "local": ["utils", "models", "config", ...],
    "by_file": {
        "main.py": {...},
        "app.py": {...}
    }
}

Example Workflows

Generate Requirements

analyzer = DependencyAnalyzer()
deps = analyzer.generate_requirements("./src")
analyzer.save_requirements(deps, "requirements.txt")

Find Unused Imports

analyzer = DependencyAnalyzer()
unused = analyzer.find_unused_imports("main.py")
for imp in unused:
    print(f"Line {imp['line']}: {imp['module']} is unused")

Analyze Project Structure

analyzer = DependencyAnalyzer()
result = analyzer.analyze_project("./myproject")

print("Third-party dependencies:")
for dep in result['third_party']:
    print(f"  - {dep}")

print("\nLocal modules:")
for mod in result['local']:
    print(f"  - {mod}")

Check for Circular Imports

analyzer = DependencyAnalyzer()
circular = analyzer.find_circular_imports("./src")
if circular:
    print("Circular imports detected:")
    for cycle in circular:
        print(f"  {' -> '.join(cycle)}")

Module Classification

Type	Description	Example
stdlib	Python standard library	os, sys, json
third_party	External packages	requests, pandas
local	Project modules	utils.helpers

Dependencies

No external dependencies - uses Python standard library (ast module).