fixes and cleanups throughout

scripts/exec_wrapper.py

@@ -92,9 +92,8 @@ exec_wrapper_tracemalloc_setup()
 try:
 	sys.argv.pop(0)
 	exec_wrapper_execed_file = sys.argv[0]
-	with open(sys.argv[0]) as fp:
-		text = fp.read()
-	exec(text)
+	with open(exec_wrapper_execed_file) as fp:
+		exec(fp.read())
 except SystemExit as e:
 	if e.code != 0 and not os.getenv('EXEC_WRAPPER_NO_TRACEBACK'):
 		exec_wrapper_write_traceback()

scripts/tx-v2-to-v3.py

@@ -26,7 +26,8 @@ cmd_args = opts.init(opts_data)
 
 from mmgen.tx import *
 
-if len(cmd_args) != 1: opts.usage()
+if len(cmd_args) != 1:
+	opts.usage()
 
 tx = MMGenTX(cmd_args[0],quiet_open=True)
 tx.write_to_file(ask_tty=False,ask_overwrite=not opt.quiet,ask_write=not opt.quiet)