IDA python script that prints to console in batch mode

ida_hello.py

import idc
import os

# you won't see this on the console
print("hello")


class Log:
    def __init__(self, logfile):
        self.logfile = logfile
        self.logfh = None

    def log(self, msg):
        if self.logfh is None:
            if self.logfile is None:
                self.logfh = os.fdopen(1, "w")
            else:
                self.logfh = open(self.logfile, "a")
            # sys.stderr = self.logfh
        self.logfh.write(f"{msg}\n")
        self.logfh.flush()


# log = Log("./log.txt")
log = Log(None)
log.log("Test")


def main():
    idc.auto_wait()
    log.log("Hello from IDAPython")
    for i, arg in enumerate(idc.ARGV):
        log.log(f"ARGV[{i}]={arg}")

    return 0


main()
idc.qexit(0)