sys.settrace()
sys.settrace() is a Python function in the Sys Module category. Sets a trace function for debugging (called for each line of code). The syntax is sys.settrace(tracefunc). Returns: None. A typical example: def trace(frame, event, arg):
print(event, frame.f_lineno)
return trace
sys.settrace(trace). A close sibling is sys.argv, which a list of command-line arguments passed to a Python script. sys.argv[0] is the script name. A close sibling is sys.exit(), which exits the interpreter by raising SystemExit. arg can be an integer (exit code) or a string. A close sibling is sys.path, which a list of module search paths. Can be modified to add import directories. A close sibling is sys.version, which a string containing the Python interpreter version. More about this category: System-specific parameters and functions — argv, path, exit. Related Sys Module entries: sys.argv, sys.exit(), sys.path, sys.version, sys.platform, sys.stdin. This page is part of the free Python Reference documentation covering 978+ functions, methods, and modules with examples and parameter details.