upload big file in Django with process bar and i get error : MemoryError

[fishhook]

As DeaD_EyE sad, "print" function can be the reason of troubles, especially in Windows (you use Windows as I guess seeing IIS).
I've run the same code on Windows 10 Pro core I7 64GB, And Linux virtual machine.

import timeit
print(timeit.timeit("print(1)", number=1000))

Now, look to results:

Windows:
0.2165976

Linux:
0.0051541

First of all rid of print. It gives you terrible overhead in any case.
Second, try your code on the usually recommended environment: Linux + uwsgi + Nginx. I can't except, that IIS is the trouble maker.