def main():
equations = [ep.Equation("ek = 0.5 m1 v^2"),ep.Equation("ep = m2 g h")]
equivalencies = [["m1","m2"],["ek","ep"]]
rewrites = {"v":ss.rearrange(equations[0],"v")}
while True:
printState(equations,equivalencies,rewrites)
instruction = raw_input(">> ")
if instruction == "":
pass
elif instruction[:5]=="add e":
equations.append(ep.Equation(instruction[12:]))
elif instruction[:5]=="rewri":
arg = instruction.split()[1]
rewrites[arg] = ss.rewrite(arg,equations)
elif instruction[:5]=="decla":
equivalencies.append(instruction.split()[2:])
elif instruction[:5]=="resta":
args = instruction.split()
rewrites[args[1]] = ss.removeTerm(rewrites[args[1]],args[3],
equations[int(args[5])],equivalencies)
elif instruction=="quit":
return
else:
print "Instruction not understood"
print
def main():
equations = [ep.Equation("ek = 0.5 m1 v^2"), ep.Equation("ep = m2 g h")]
equivalencies = [["m1", "m2"], ["ek", "ep"]]
rewrites = {"v": ss.rearrange(equations[0], "v")}
while True:
printState(equations, equivalencies, rewrites)
instruction = raw_input(">> ")
if instruction == "":
pass
elif instruction[:5] == "add e":
equations.append(ep.Equation(instruction[12:]))
elif instruction[:5] == "rewri":
arg = instruction.split()[1]
rewrites[arg] = ss.rewrite(arg, equations)
elif instruction[:5] == "decla":
equivalencies.append(instruction.split()[2:])
elif instruction[:5] == "resta":
args = instruction.split()
rewrites[args[1]] = ss.removeTerm(rewrites[args[1]], args[3],
equations[int(args[5])],
equivalencies)
elif instruction == "quit":
return
else:
print "Instruction not understood"
print
def rewrite(arg,equations): for equation in equations: if arg in equation.terms: return ss.rearrange(equation,arg) raise Exception
def rewrite(arg, equations):
for equation in equations:
if arg in equation.terms:
return ss.rearrange(equation, arg)
raise Exception
