Writing the user input to a binary file in hex format using Python 3.8

I am new to python and was trying to do a simple job but I am having a problem. I am trying to take a large number as input from user say 500 and write it to a file in hex format. For this I tried to take a small number as first step and write it, but I get the error as below

10 
0xa 
Traceback (most recent call last):
   File "temp.py", line 7, in <module>
    fp.write(bytes(('num',))) TypeError: 'str' object cannot be interpreted as an integer

The sample code used is as below.

intval = int(input())
num = hex(intval)
print(num)
with open('hexFile.iotabin', 'wb') as fp:
    fp.write(bytes(('num',)))
    fp.close()

Could you let me know

What am I doing wrong here?
For large number say 500, I would like to split it to two bytes while writing. Will to_bytes() be able to help once the issue above is resolved or is there any other simple way.

source https://stackoverflow.com/questions/69360021/writing-the-user-input-to-a-binary-file-in-hex-format-using-python-3-8

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