circuitpython/tests/float/string_format_modulo2_intbig.py at main · ams1/circuitpython · GitHub

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# test formatting floats with large precision, that it doesn't overflow the buffer

def test(num, num_str):

if num == float("inf") or num == 0.0 and num_str != "0.0":

# skip numbers that overflow or underflow the FP precision

return

for kind in ("e", "f", "g"):

# check precision either side of the size of the buffer (32 bytes)

for prec in range(23, 36, 2):

fmt = "%." + "%d" % prec + kind

s = fmt % num

check = abs(float(s) - num)

if num > 1:

check /= num

if check > 1e-6:

print("FAIL", num_str, fmt, s, len(s), check)

# check most powers of 10, making sure to include exponents with 3 digits

for e in range(-101, 102):

num = pow(10, e)

test(num, "1e%d" % e)