py.exe: printing ascii number 7

[qrani]

I was messing around in python with ascii,
And I found something I think is interesting.
This:

quitfunc = 'r'
while(quitfunc == 'r'):
    ascnum = input('input an ascii number\nstandard 0-127\n')
    ascnum = int(ascnum)
    asctext = str(chr(ascnum))
    print(asctext)
    quitfunc = input("type 'r' to redo\n")

and that if you input 7,
it makes a "beep" sound despite it saying

print(asctext)

another weird thing about this is that it doesn't work with shell,
only with py.exe.
I wanna know why this happens.
I also wanna know if this works on other operating systems,
or other versions of python(I was using 3.6.3)
sadly, I couldn't find a "beep" sound that accurately sounded like
the one in py.exe, so your just gonna have to take my word for it.