def test_changing_precision():
"""Change precision on the fly."""
formula = Formula("2*asin(x)", 16)
assert formula.get({"x": "1"})[0:16] == "3.14159265358979"
assert formula.get({"x": "1"}, 10) == "3.141592654"
formula.precision = 24
digits = 18
format_flags = FmtFlags.fixed
assert formula.get({"x": "1"}, digits,
format_flags) == "3.141592653589793238"
formula.set_precision(240)
assert formula.precision == 256
assert (formula.get({"x": "1"})[0:256] ==
"3.141592653589793238462643383279502884197169399375105820974944"
"59230781640628620899862803482534211706798214808651328230664709"
"38446095505822317253594081284811174502841027019385211055596446"
"22948954930381964428810975665933446128475648233786783165271201"
"90914564")
