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trace Module

The trace module provides tracing of program execution and coverage analysis, showing which lines of code are executed.

Complexity Reference

Operation	Time	Space	Notes
Trace.run()	O(n)	O(n)	n = bytecode instructions; significant overhead per line
Coverage analysis	O(n)	O(n)	Track executed lines; stores line counts

Program Tracing

Basic Execution Tracing

import trace

def fibonacci(n):
    if n <= 1:
        return n
    return fibonacci(n-1) + fibonacci(n-2)

# Create tracer - O(1)
tracer = trace.Trace(count=False, trace=True)

# Run with trace - O(n)
tracer.run('fibonacci(5)')

# Output shows each line executed

Coverage Analysis

import trace

def calculate(x, y):
    result = x + y
    unused = x * y  # This line might not execute
    return result

# Create coverage tracer - O(1)
tracer = trace.Trace(count=True, trace=False)

# Run - O(n)
tracer.run('calculate(2, 3)')

# Get results - O(1)
results = tracer.results()
results.write_results(show_missing=True)

Related Documentation

• sys Module
• dis Module