Unable to read huge (20GB) file from CPython

Question

I have some CPython issue that I cannot understand. It all boils down to the fact that using the same code to read small text file works but cannot even read a single line from

Answer 1

def my_readline(fh,delim):
    return "".join(iter(lambda:fh.read(1),delim))

f = open(some_file)
line = my_readline(f,"\r")

should work if you can at least get .read(1) to work ... but if that doesnt work I dont know that anything will ... maybe use shell commands to split the file into smaller chunks somehow ... but I suspect beroe's answer is the real answer