Int.From_Bytes Method - Conversion of Non-Escaped Bytes Objects

[new_coder_231013]

Hello,

Sorry in advance for the likely basic nature of this question. I'm wondering how the "int.from_bytes" method returns the output that it does when it's converting input other than the escaped parts of bytes objects (see below for some examples).

These examples I understand - they're simply converting hexadecimals to decimal integers.

print(int.from_bytes(b'\x0f', "little"))

Output:
15

print(int.from_bytes(b'\xc0\xff\xee', "big"))

Output:
12648430

print(int.from_bytes(b'\xc0\xff\xee', "little"))

Output:
15663040

These examples I don't understand:

print(int.from_bytes(b'1', "big"))

Output:
49

print(int.from_bytes(b'Hello world', "big"))

Output:
87521618088882671231069284

print(int.from_bytes(b'Helloworld', "big"))

Output:
341881320660071462628452

Does it have something to do with the base system of the input and / or output - such as the particular base system the method assumes the input is expressed in? Or the base system it uses for the output? What am I missing here?

Thanks so much in advance for any help and have a great day.