#7 surprised me. But after looking at the the bytecodes, it's clear why. The while-True adds 3 byte codes to the loop body, the while-constant (using any cons

#7 surprised me. But after looking at the the bytecodes, it's clear why. The while-True adds 3 byte codes to the loop body, the while-constant (using any constant 'truthy' value) adds 1: >>> import dis >>> def a(): ... while 1: pass ... >>> def b(): ... while True: pass ... >>> dis.dis(a) 2 0 SETUP_LOOP 3 (to 6) >> 3 JUMP_ABSOLUTE 3 >> 6 LOAD_CONST 0 (None) 9 RETURN_VALUE >>> dis.dis(b) 2 0 SETUP_LOOP 10 (to 13) >> 3 LOAD_GLOBAL 0 (True) 6 POP_JUMP_IF_FALSE 12 9 JUMP_ABSOLUTE 3 >> 12 POP_BLOCK >> 13 LOAD_CONST 0 (None) 16 RETURN_VALUE