File: emg_exc.py

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# test that emergency exceptions work

import micropython
import sys
try:
    import uio
except ImportError:
    print("SKIP")
    raise SystemExit

# some ports need to allocate heap for the emg exc
try:
    micropython.alloc_emergency_exception_buf(256)
except AttributeError:
    pass

def f():
    micropython.heap_lock()
    try:
        raise ValueError(1)
    except ValueError as er:
        exc = er
    micropython.heap_unlock()

    # print the exception
    buf = uio.StringIO()
    sys.print_exception(exc, buf)
    for l in buf.getvalue().split("\n"):
        if l.startswith("  File "):
            print(l.split('"')[2])
        else:
            print(l)

f()