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improve printing ofr FormalExp

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lafrite 2014-01-28 21:04:27 +01:00 committed by Lafrite
parent eece262566
commit cb198eb5f0
1 changed files with 18 additions and 4 deletions
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22
pymath/formal.py
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@ -134,13 +134,27 @@ class FormalExp(object):
return len(list(self._coef.keys()))
def __str__(self):
return " + ".join([str(v) + str(k) for k,v in self._coef.items()])
ans = ""
for k,v in self._coef.items():
if v < 0:
ans += "-"
else:
ans += "+"
if abs(v) == 1:
ans += str(k)
else:
ans += str(abs(v)) + str(k)
if ans[0] == "+":
return ans[1:]
else:
return ans
if __name__ == '__main__':
fe1 = FormalExp({"x": 1, "":2})
print(fe1.get_postfix())
fe1 = FormalExp({"x": -1, "":-2})
print(fe1)
fe2 = FormalExp({"x^12": 5, "":2})
print(fe2.get_postfix())
print(fe2)
fe3 = fe1 * fe2
for s in fe3:
print(s)