Avoid eval function

Never use the eval() function in Python code as it creates serious security vulnerabilities by executing arbitrary code at runtime. This can lead to code injection attacks when processing user inputs or data from untrusted sources.

Instead of using eval() to convert strings to booleans or other types, use explicit type conversion or conditional logic:

# INSECURE - vulnerable to code injection:
def setting_ctx(use_gpu):
    if eval(use_gpu):
        # code that uses GPU
        
# SECURE - using explicit boolean conversion:
def setting_ctx(use_gpu):
    if isinstance(use_gpu, str):
        use_gpu = use_gpu.lower() in ('true', 'yes', '1', 'y')
    if use_gpu:
        # code that uses GPU

For other type conversions, use appropriate functions like int(), float(), or json.loads() to safely parse data without executing code.