Rafael Harth comments on Diagonalization Fixed Point Exercises

[Rafael Harth]

Ex8

This was reasonably straight-forward given the quine.

def apply(f):
    l = chr(123) # opening curly bracket
    r = chr(125) # closing curly bracket
    q = chr(39) # single quotation mark
    n = chr(10) # linebreak
    z = [n+"    ", l+f"z[i]"+r+q+n+"        + f"+q]
    x = [n+"        ", l+f"x[i]"+r]
    e = [q, l+"e[i]"+r+q+")"+n+"    print(f(sourcecode))"]
    sourcecode = ""
    for i in range(0,2):
        sourcecode += (f'def apply(f):{z[i]}'
        + f'l = chr(123) # opening curly bracket{z[i]}'
        + f'r = chr(125) # closing curly bracket{z[i]}'
        + f'q = chr(39) # single quotation mark{z[i]}'
        + f'n = chr(10) # linebreak{z[i]}'
        + f'z = [n+"    ", l+f"z[i]"+r+q+n+"        + f"+q]{z[i]}'
        + f'x = [n+"        ", l+f"x[i]"+r]{z[i]}'
        + f'e = [q, l+"e[i]"+r+q+")"+n+"    print(f(sourcecode))"]{z[i]}'
        + f'sourcecode = ""{z[i]}'
        + f'for i in range(0,2):{x[i]}sourcecode += (f{e[i]}')
    print(f(sourcecode))