# Tests various constants of the math module. import sys try: from array import array from math import e, pi except ImportError: print("SKIP") raise SystemExit # Hexadecimal representations of e and pi constants. e_truth_single = 0x402DF854 pi_truth_single = 0x40490FDB e_truth_double = 0x4005BF0A8B145769 pi_truth_double = 0x400921FB54442D18 # Detect the floating-point precision of the system, to determine the exact values of # the constants (parsing the float from a decimal string can lead to inaccuracies). if float("1e300") == float("inf"): # Single precision floats. e_truth = array("f", e_truth_single.to_bytes(4, sys.byteorder))[0] pi_truth = array("f", pi_truth_single.to_bytes(4, sys.byteorder))[0] else: # Double precision floats. e_truth = array("d", e_truth_double.to_bytes(8, sys.byteorder))[0] pi_truth = array("d", pi_truth_double.to_bytes(8, sys.byteorder))[0] print("e:", e == e_truth or (e, e_truth, e - e_truth)) print("pi:", pi == pi_truth or (pi, pi_truth, pi - pi_truth))