def test_others():
resolver = ExpressionResolver(verbose=False)
ret = resolver.solve(expression="0 = X + X")
assert ret == "0.0"
ret = resolver.solve(expression="0 = X ^ 2 + X^ 2")
assert ret == "0.0"
def main(argv=None):
print()
parser = argparse.ArgumentParser()
parser.add_argument("expression", type=str, help="Insert expression to resolve.")
parser.add_argument(
"-v",
"--verbose",
help="Add verbose and print different resolving step.",
action="store_true",
)
parser.add_argument(
"-vv",
"--force_calculator_verbose",
help="Add all verbose and force the calculator verbose.",
action="store_true",
)
args = parser.parse_args(argv)
resolver = ExpressionResolver(
verbose=args.verbose | args.force_calculator_verbose,
force_calculator_verbose=args.force_calculator_verbose,
)
try:
result = resolver.solve(args.expression)
if isinstance(result, list):
print("The ", len(result), " solutions are :")
for res in result:
print(res)
else:
print("result = ", result)
except SyntaxError as e:
print("The expression syntax is not accepted : ", e)
except ValueError as e:
print("One of the value in the expression is not accepted : ", e)
except NotImplementedError as e:
print("One of the methods needed is not implemented yet : ", e)
except NothingToDoError as e:
print(e)
except Exception as e:
print("An exception appened : ", e)
def test_equations_infinite_solution():
resolver = ExpressionResolver(verbose=False)
# Numbers only
ret = resolver.solve(expression="2 = 2")
assert ret == "X can be any real number."
ret = resolver.solve(expression="5 * X^0 = 5 * X^0")
assert ret == "X can be any real number."
ret = resolver.solve(expression="4 * X^0 = 8")
assert ret == "There is no solution for this equation."
# Float only
ret = resolver.solve(expression="2.2456 = 2.2456")
assert ret == "X can be any real number."
def test_equation_subject():
resolver = ExpressionResolver(verbose=False)
ret = resolver.solve(expression="5 * X^0 + 4 * X^1 - 9.3 * X^2 = 1 * X^0")
assert ret == ["-0.475131", "0.905239"]
ret = resolver.solve(expression="5 * X^0 + 4 * X^1 = 4 * X^0")
assert ret == "-0.25"
with pytest.raises(NotImplementedError) as e:
ret = resolver.solve(
expression="8 * X^0 - 6 * X^1 + 0 * X^2 - 5.6 * X^3 = 3 * X^0")
assert (
str(e.value) ==
"The polynomial degree is strictly greater than 2, the resolver is not implemented yet."
)
ret = resolver.solve(expression="5 + 4 * X + X^2= X^2")
def test_any_calc():
resolver = ExpressionResolver(verbose=False)
calculator = _Calculator()
with pytest.raises(NotImplementedError) as e:
ret = resolver.solve(expression=" (5 + 2y)(2 - (2y * 3y))")
assert str(e.value) == "Var cannot be inside a parenthesis for the moment."
ret = resolver.solve(expression="y[5 + 2](2 - {2 * -3.54]]")
assert ret == "63.56*Y"
ret = resolver.solve(expression="5y/y")
assert ret == "5.0"
with pytest.raises(NotImplementedError) as e:
ret = resolver.solve(expression=" -5 - 4 * X + X^2= X^2 + x^5")
assert (
str(e.value) ==
"The polynomial degree is strictly greater than 2, the resolver is not implemented yet."
)
def test_wrong_args():
resolver = ExpressionResolver(verbose=False)
# Wrong args
with pytest.raises(SyntaxError) as e:
resolver.solve(expression="6&7-2")
assert str(
e.value
) == "This is not an expression or some of the operators are not reconized."
# Sign without value after
with pytest.raises(SyntaxError) as e:
resolver.solve(expression="4^0-")
assert str(
e.value
) == "Operators or sign must be followed by a value or a variable."
# Operator wrong syntax
with pytest.raises(SyntaxError) as e:
resolver.solve(expression="42//5")
assert (
str(e.value) ==
"Operators must be followed by a value or a variable, not another operator."
)
# More than one = in the expression
with pytest.raises(NotImplementedError) as e:
resolver.solve(expression="42 * X = 42 * Y = 42 * Z")
assert str(
e.value) == "More than one comparison is not supported for the moment."
# lot of sign and operator between
with pytest.raises(SyntaxError) as e:
ret = resolver.solve(expression="4^+-+^++-0 = 0")
assert (
str(e.value) ==
"Operators must be followed by a value or a variable, not another operator."
)
# multiple comma in one number
with pytest.raises(SyntaxError) as e:
ret = resolver.solve(expression="450.25.45 + 12")
assert str(e.value) == "Some numbers are not well formated : 450.25.45"
# wrong use of comma
with pytest.raises(SyntaxError) as e:
ret = resolver.solve(expression="450. + 12")
assert str(e.value) == "Some numbers are not well formated (Comma error)."
# wrong use of comma
with pytest.raises(SyntaxError) as e:
ret = resolver.solve(expression=".45 + 12")
assert str(e.value) == "Some numbers are not well formated (Comma error)."
# Sign before operator
with pytest.raises(SyntaxError) as e:
ret = resolver.solve(expression="45 + * 12")
assert (
str(e.value) ==
"Operators must be followed by a value or a variable, not another operator."
)
# Test sign before closing parenthesis
with pytest.raises(SyntaxError) as e:
ret = resolver.solve(expression="5 * (5 +)10")
assert (
str(e.value) ==
"Operators must be followed by a value or a variable, not another operator."
)
# Test operator before closing parenthesis
with pytest.raises(SyntaxError) as e:
ret = resolver.solve(expression="5 * (5 *)10")
assert (
str(e.value) ==
"Operators must be followed by a value or a variable, not another operator."
)
# Test BIGGER than float input
with pytest.raises(ValueError) as e:
ret = resolver.solve(
expression=
"-X ^ 3 * 10X ^ 4+ x ^ 2 +x - x ^4 + X ^ 3 - X^1209349432411111115555555555555555555558888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444 - X"
)
assert str(
e.value
) == "A number is too big, no input number should reach float inf or -inf."
# Test BIGGER than float input
with pytest.raises(ValueError) as e:
ret = resolver.solve(
expression=
"-X ^ 3 * 10X ^ 4+ x ^ 2 +x - x ^4 + X ^ 3 - 1209349432411111115555555555555555555558888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444 - X"
)
assert str(
e.value
) == "A number is too big, no input number should reach float inf or -inf."
def test_expression_parser():
resolver = ExpressionResolver(verbose=False)
# Test sign before var
ret = resolver.solve(expression="+X = 10")
# Test sign before var
ret = resolver.solve(expression="-X = 10")
# Test sign before var
ret = resolver.solve(expression="-X")
# Test sign before var
ret = resolver.solve(expression=" +X")
# Test addition with sign before var
ret = resolver.solve(expression="+X = -x")
# lot of sign
ret = resolver.solve(expression="4-+-2 ------+-----++++++2")
# lot of sign
ret = resolver.solve(expression="4-+-2 *+-+++- 0")
# Extra zero
ret = resolver.solve(expression="04578 + 000450")
assert ret == "5028.0"
# Test method _replace_zero_power_by_one
ret = resolver.solve(expression="04578 + 15000 ^0")
assert ret == "4579.0"
# Test method _replace_zero_power_by_one, the following one shouln't proc because it use a parenthesis
ret = resolver.solve(expression="04578 + (15000 * 450)^0")
assert ret == "4579.0"
# Test replacing sign before numbers
ret = resolver.solve(expression="-4 + (+15 * -45)-0")
# Test with var
ret = resolver.solve(expression="X ^ 2 + X ^ 1 + x ^ 2")
assert ret == "2.0X^2.0+X"
# Test with var
ret = resolver.solve(expression="X ^ 2 + x + x")
assert ret == "2.0X+X^2.0"
# Test with var
ret = resolver.solve(expression="X ^ 2 + x + x + x ^2")
assert ret == "2.0X^2.0+2.0X"
# Test with var
ret = resolver.solve(expression="X ^ 2 + x + x - x ^2")
assert ret == "2.0X"
# Test with var
ret = resolver.solve(expression="X ^ 2 + x + x - x ^2 - x")
assert ret == "X"
def test_equation_degree_two():
resolver = ExpressionResolver(verbose=False)
ret = resolver.solve(expression="x^2+x-2 = 0")
assert ret == ["1.0", "-2.0"]
ret = resolver.solve(expression="x^2+3x+2=0")
assert ret == ["-1.0", "-2.0"]
ret = resolver.solve(expression="x ^2 + x + 1 = 0")
assert ret == ["-0.5+0.866026*i", "-0.5-0.866026*i"]
ret = resolver.solve(expression="4x ^2 + 4x + 1 = 0")
assert ret == "-0.5"
ret = resolver.solve(expression="-x ^2 + 2x - 3 = 0")
assert ret == ["1.0-1.414214*i", "1.0+1.414214*i"]
ret = resolver.solve(expression="x ^2 + 4x = 0")
assert ret == ["0.0", "-4.0"]
ret = resolver.solve(expression="x ^2 -2x + 1 = 0")
assert ret == "1.0"
ret = resolver.solve(expression="x ^ 2 + 1= 0")
assert ret == ["i", "-i"]
ret = resolver.solve(expression="x^2 -4x + 4 -1= 0")
assert ret == ["3.0", "1.0"]
ret = resolver.solve(expression="X ^ 2 + X ^1 + x ^2 = 0")
assert ret == ["0.0", "-0.5"]
ret = resolver.solve(expression="X ^ 2 + X ^1 - x ^2 = 0")
assert ret == "0.0"
ret = resolver.solve(expression="-X ^ 2 + X ^1 + x ^2 = 0")
assert ret == "0.0"
ret = resolver.solve(expression="-X ^ 2 + X ^1 - x ^2 = 0")
assert ret == ["0.0", "0.5"]
ret = resolver.solve(expression="X ^ 2 + X ^1 + x ^1 = 0")
assert ret == ["0.0", "-2.0"]
ret = resolver.solve(expression="X ^ 2 - X ^1 + x ^1 = 0")
assert ret == "0.0"
ret = resolver.solve(expression="X ^ 2 - X ^1 - x ^1 = 0")
assert ret == ["2.0", "0.0"]
# 0 coeff
ret = resolver.solve(expression="0x^2 =0")
assert ret == "X can be any real number."
ret = resolver.solve(expression="0x^2 * X^1 10X^0 =0")
assert ret == "X can be any real number."
ret = resolver.solve(expression="0x^2 * X^1 + 10X^0 =0")
assert ret == "There is no solution for this equation."
ret = resolver.solve(expression="0x^2 + X^1 + 10X^0 =0")
assert ret == "-10.0"
ret = resolver.solve(expression="-0x^2 + X^1 + 10X^0 =0")
assert ret == "-10.0"
ret = resolver.solve(expression="-0x^2 - X^1 + 10X^0 =0")
assert ret == "10.0"
ret = resolver.solve(expression="-x^2 - 0X^1 + 10X^0 =0")
assert ret == ["-3.162278", "3.162278"]
ret = resolver.solve(expression="-x^2 - -0X^1 + 10X^0 =0")
assert ret == ["-3.162278", "3.162278"]
ret = resolver.solve(expression="-x^2 - -0X^1 -0X^0 =0")
assert ret == "0.0"
ret = resolver.solve(expression="-0x^2 - -0X^1 -0X^0 =0")
assert ret == "X can be any real number."
# positive discriminant
ret = resolver.solve(
expression="5 * X^0 + 13 * X^1 + 3 * X^2 = 1 * X^0 + 1 * X^1")
assert ret == ["-0.367007", "-3.632993"]
# Zero discriminant
ret = resolver.solve(
expression="6 * X^0 + 11 * X^1 + 5 * X^2 = 1 * X^0 + 1 * X^1")
assert ret == "-1.0"
# Negative discriminant
ret = resolver.solve(
expression="5 * X^0 + 3 * X^1 + 3 * X^2 = 1 * X^0 + 0 * X^1")
assert ret == ["-0.5+1.040833*i", "-0.5-1.040833*i"]
def test_equation_degree_one():
resolver = ExpressionResolver(verbose=False)
ret = resolver.solve(expression="5 * X^0 + 4 * X^1 = 41 * X^0")
assert ret == "9.0"
ret = resolver.solve(
expression=
"-51516544 * X^0 + 4241.1 * X^1 + 1213545 = ---41 * X^0 + -X^1")
assert ret == "11858.032106739585"
ret = resolver.solve(expression="X ^1 = X ^ 1")
assert ret == "X can be any real number."
ret = resolver.solve(expression="X = X")
assert ret == "X can be any real number."
ret = resolver.solve(expression="X^0 = X^0")
assert ret == "X can be any real number."
ret = resolver.solve(expression="-0x^2 - -X^1 -0X^0 =0")
assert ret == "0.0"
# Multiplier small after var
ret = resolver.solve(expression=" X*0.001=0.000001")
assert ret == "0.001"
ret = resolver.solve(expression=" X*0.001=-0.000001")
assert ret == "-0.001"
ret = resolver.solve(expression="5 * X^0 = 4 * X^0 + 7 * X^1")
assert ret == "0.14285714285714285"
def test_wrong_equation():
resolver = ExpressionResolver(verbose=False)
# Numbers only false
ret = resolver.solve(expression="2 = -2")
assert ret == "The equation is False."
# Numbers with var^0 false
ret = resolver.solve(expression="2*X^0 = -2*X^0")
assert ret == "There is no solution for this equation."
# Float only false
ret = resolver.solve(expression="2.2456 = -2.2456")
assert ret == "The equation is False."
# power var with negative value
with pytest.raises(NotImplementedError) as e:
ret = resolver.solve(expression="2 = -2X^-5")
assert str(
e.value) == "Some part of the polynomial var have negative power."
# power var with negative value
with pytest.raises(NotImplementedError) as e:
ret = resolver.solve(expression="2 = -2X^(-5)")
assert str(
e.value) == "Some part of the polynomial var have negative power."
# power var with irrational value
with pytest.raises(NotImplementedError) as e:
ret = resolver.solve(expression="2 = -2X^5.00000005")
assert str(e.value) == "irrational numbers are not accepted as exponent."
# power var with negative irrational value
with pytest.raises(NotImplementedError) as e:
ret = resolver.solve(expression="2 = -2X^-5.00000005")
assert str(
e.value) == "Some part of the polynomial var have negative power."
# power var with negative irrational value
with pytest.raises(NotImplementedError) as e:
ret = resolver.solve(expression="2 = -2X^((-5.00000005))")
assert str(
e.value) == "Some part of the polynomial var have negative power."
with pytest.raises(NotImplementedError) as e:
ret = resolver.solve(expression="x^3 + 2x^2 -3x = 0")
assert (
str(e.value) ==
"The polynomial degree is strictly greater than 2, the resolver is not implemented yet."
)
# Nothing left
with pytest.raises(SyntaxError) as e:
ret = resolver.solve(expression=" =0")
assert str(
e.value) == "The equation is not well formated. No left or right part."
def test_calculator():
resolver = ExpressionResolver(verbose=False)
# Simple test
ret = resolver.solve(expression="5 * 5^0")
assert ret == "5.0"
# Simple test exponential
ret = resolver.solve(expression="5 * 5^10")
assert ret == "48828125.0"
# Simple test with priority
ret = resolver.solve(expression="5 * 5 + 10")
assert ret == "35.0"
# Simple test with float
ret = resolver.solve(expression="5.3 * 5.2 + 10.8")
assert ret == "38.36"
# Test with parenthesis
ret = resolver.solve(expression="5 * (5 + 10)")
assert ret == "75.0"
# Test with multiple parenthesis
ret = resolver.solve(expression="5 * (5 + (10 * 50 + 2))")
assert ret == "2535.0"
# Test with multiple useless parenthesis
ret = resolver.solve(expression="((((5 * (5 + (10 * 50 + 2))))))")
assert ret == "2535.0"
# Hard test with multiple parenthesis
ret = resolver.solve(
expression=
"5 * (5 + (10 * 50 + 24.15) * 50 * 18 *(12 + 52)) * (18 - (5 + 2))")
assert ret == "1660507475.0"
# Hard test with float
ret = resolver.solve(
expression="545875785748.34444444478 * 5.2542 + 10456.81212")
assert my_round(float(ret), 2) == my_round(2868140563935.763, 2)
# Implicit multiplication with open parenthesis
ret = resolver.solve(expression="25(5 + 2)")
assert ret == "175.0"
# Implicit multiplication with closing parenthesis
ret = resolver.solve(expression="(5 + 2)25")
assert ret == "175.0"
# Test different parenthesis
ret = resolver.solve(expression="(5 + 2]25")
assert ret == "175.0"
# Test different parenthesis
ret = resolver.solve(expression="[5 + 2]25")
assert ret == "175.0"
# Test different parenthesis
ret = resolver.solve(expression="[5 + 2}25")
assert ret == "175.0"
# Test multiplying by a signed number
ret = resolver.solve(expression="5 * -10 + 599")
assert ret == "549.0"
# Test multiplying by a signed number
ret = resolver.solve(expression="5 * +10")
assert ret == "50.0"
# Test multiplying by a signed number in parenthesis
ret = resolver.solve(expression="5 * (+10)")
assert ret == "50.0"
# Test multiplying by a signed number in parenthesis
ret = resolver.solve(expression="(+10)10")
assert ret == "100.0"
# Test substract by a signed number in parenthesis
ret = resolver.solve(expression="(-10)-10")
assert ret == "-20.0"
# Test substract by a signed number in parenthesis
ret = resolver.solve(expression="(-10)(-10)")
assert ret == "100.0"
# Test multiplying by a signed float
ret = resolver.solve(expression="5 * -10.35843958432134 + 599")
assert my_round(float(ret), 2) == my_round(547.2078020783933, 2)
# Test sign before first number
ret = resolver.solve(expression="-42-2")
assert ret == "-44.0"
# Test one var with parenthesis in calculator
ret = resolver.solve(expression="5 * x(5 + 10)")
assert ret == "75.0*X"
def test_calculator_wrong_args():
resolver = ExpressionResolver(verbose=False)
# Test with wrong parenthesis number
with pytest.raises(SyntaxError) as e:
ret = resolver.solve(expression="5 * (5 + (10 * 50 + 2)")
assert str(e.value) == "Problem with parenthesis."
# Test with wrong parenthesis number
with pytest.raises(SyntaxError) as e:
ret = resolver.solve(expression="5 * (5 + (10 * 50 + (2))")
assert str(e.value) == "Problem with parenthesis."
# Test with right parenthesis number but not good open/close order
with pytest.raises(SyntaxError) as e:
ret = resolver.solve(expression="5 * (5)10 * 50 + )2()(")
assert str(e.value) == "Closing parenthesis with no opened one."
# Test with right parenthesis number but not good open/close order
with pytest.raises(SyntaxError) as e:
ret = resolver.solve(expression="5 + (5 + 10) + 2)(15*2")
assert str(e.value) == "Closing parenthesis with no opened one."
# Test two var in calculator
with pytest.raises(SyntaxError) as e:
ret = resolver.solve(expression="5 * x(5 + 10) * y")
assert str(e.value) == "Calculator does not accept more than 1 var."
# Test wrong operation for vars
with pytest.raises(NotImplementedError) as e:
ret = resolver.solve(expression="5 * x% 2")
assert str(
e.value
) == "This type of operation with vars is not accepted for the moment."
# Test wrong operation for vars
with pytest.raises(NotImplementedError) as e:
ret = resolver.solve(expression="5 * x% x")
assert str(
e.value
) == "This type of operation with vars is not accepted for the moment."
# Test calc with var, var in simple parenthesis
with pytest.raises(NotImplementedError) as e:
ret = resolver.solve(expression="-5 - (2thisisavar(2(2+5)) * -1)")
assert str(e.value) == "Var cannot be inside a parenthesis for the moment."
# Test calc with var, dividing number by a var
with pytest.raises(NotImplementedError) as e:
ret = resolver.solve(expression="50 / x * x + (5 * 2)")
assert str(e.value) == "Cannot divide a number by a var for the moment."
# Test calc with var, power var by var
with pytest.raises(NotImplementedError) as e:
ret = resolver.solve(expression="50x^X")
assert str(e.value) == "Cannot power a var by a var for the moment."
# Test calc with var, power number by var
with pytest.raises(NotImplementedError) as e:
ret = resolver.solve(expression="50^X")
assert str(e.value) == "Cannot power a number by a var for the moment."
# Test dividing by zero
with pytest.raises(ValueError) as e:
ret = resolver.solve(expression="50/0")
assert str(
e.value
) == "('The expression lead to a division by zero : ', 50.0, ' / ', 0.0)"
# Test modulo by zero
with pytest.raises(ValueError) as e:
ret = resolver.solve(expression="50%0")
assert str(
e.value
) == "('The expression lead to a modulo zero : ', 50.0, ' % ', 0.0)"
# Test dividing by zero for a var
with pytest.raises(ValueError) as e:
ret = resolver.solve(expression="X/0")
assert str(
e.value
) == "('The expression lead to a division by zero : ', 'X', ' / ', '0.0')"
# Test modulo by zero for a var
with pytest.raises(NotImplementedError) as e:
ret = resolver.solve(expression="X%0")
assert str(
e.value
) == "This type of operation with vars is not accepted for the moment."
def test_calculator_with_one_var():
resolver = ExpressionResolver(verbose=False)
# Test calc with var, only one var alone, should raise NothingToDoError
with pytest.raises(NothingToDoError) as e:
resolver.solve(expression="thisisavar")
assert str(
e.value
) == "There is no operators or sign in the expression. Nothing to do here."
# Test calc with var, one var with simple addition
ret = resolver.solve(expression="thisisavar + 5")
assert ret == "5.0+THISISAVAR"
# Test calc with var, one var with simple addition
ret = resolver.solve(expression="5 + thisisavar + 5")
assert ret == "10.0+THISISAVAR"
# Test calc with var, one var with more complex addition
ret = resolver.solve(expression="5 + thisisavar + 5 (-10 +(+5))")
assert ret == "-20.0+THISISAVAR"
# Test calc with var, one var with multiplication
ret = resolver.solve(expression="5 * thisisavar")
assert ret == "5.0*THISISAVAR"
# Test calc with var, one var with multiplication
ret = resolver.solve(expression="(5 * 2) * thisisavar")
assert ret == "10.0*THISISAVAR"
# Test calc with var, one var with multiplication
ret = resolver.solve(expression="(5 * 2) * thisisavar * 2")
assert ret == "20.0*THISISAVAR"
# Test calc with var, one var with multiplication and additions
ret = resolver.solve(expression="+ 2 - 5 + (5 * 2) * thisisavar * 2 - 500")
assert ret == "-503.0+20.0*THISISAVAR"
# Test calc with var, implicit mult
ret = resolver.solve(expression="-5 - 2thisisavar2")
assert ret == "-5.0-4.0*THISISAVAR"
# Test calc with var, implicit mult
ret = resolver.solve(expression="-5 - 2thisisavar(2(2+5))")
assert ret == "-5.0-28.0*THISISAVAR"
# Test calc with var, addition between var
ret = resolver.solve(expression="x + x")
assert ret == "2.0X"
# Test calc with var
ret = resolver.solve(expression="1 * x")
assert ret == "X"
# Test calc with var
ret = resolver.solve(expression="5 * x")
assert ret == "5.0*X"
# Test calc with var
ret = resolver.solve(expression="-1 * x")
assert ret == "-X"
# Test calc with var, addition between var
ret = resolver.solve(expression="-5 - x + x * -1")
assert ret == "-5.0-2.0X"
# Test calc with var, sub between var
ret = resolver.solve(expression="x - x")
assert ret == "0.0"
# Test calc with var, sub between var
ret = resolver.solve(expression="54x - x(-2)")
assert ret == "56.0X"
# Test calc with var, multiplication between var
ret = resolver.solve(expression="x * x")
assert ret == "X^2.0"
# Test calc with var, multiplication between var
ret = resolver.solve(expression="x * 5x")
assert ret == "5.0*X^2.0"
# Test calc with var, multiplication between var
ret = resolver.solve(expression="x * x * x + (5 * 2)")
assert ret == "10.0+X^3.0"
# Test calc with var, dividing var
ret = resolver.solve(expression="x / 50 * x + (5 * 2)")
assert ret == "10.0+0.02*X^2.0"
# Test calc with var, dividing var by another var
ret = resolver.solve(expression="x / 5 / x + (5 * 2)")
assert ret == "10.2"
# Test calc with var, dividing var by another var
ret = resolver.solve(expression="2x / 5 / x + (5 * 2)")
assert ret == "10.4"
# Test calc with var, dividing var by another var
ret = resolver.solve(expression="2x^5 / 5 / x + (5 * 2)")
assert ret == "10.0+0.4*X^4.0"
# Test calc with var, dividing var by another var
ret = resolver.solve(expression="2x^5 / 5 / x *x + (5 * 2)")
assert ret == "10.0+0.4*X^5.0"
# Test calc with var, dividing var by another var
ret = resolver.solve(expression="50x/x")
assert ret == "50.0"
# Test calc with var, power var
ret = resolver.solve(expression="50x^2")
assert ret == "50.0*X^2.0"
# Test calc with var, power var
ret = resolver.solve(expression="50x^(2+5)")
assert ret == "50.0*X^7.0"
# Test calc with var
ret = resolver.solve(expression="-X ^ 3")
assert ret == "-X^3.0"
# Test calc with var
ret = resolver.solve(expression="-X ^ 3 + X ^ 3")
assert ret == "0.0"
# Test calc with var
ret = resolver.solve(expression="-X ^ 3 + x + X ^ 3")
assert ret == "X"
# Test calc with var
ret = resolver.solve(expression="-X ^ 3 + + x ^ 2 +x + X ^ 3 - x")
assert ret == "X^2.0"
# Test calc with var
ret = resolver.solve(
expression="-X ^ 3 - 10X ^ 4+ x ^ 2 +x - x ^4 + X ^ 3 - x")
assert ret == "-11.0X^4.0+X^2.0"