有空格可以跑，但是我需要没有空格的，请问怎么修改让没有空格也能跑？

报错：ValueError: invalid literal for int() with base 10: '(((2*(3+2))+5)/2)'
全部代码如下：

class Stack:
    def __init__(self):
        self.items = []
    def isEmpty(self):
        return self.items == []
    def push(self, item):
        self.items.append(item)
    def pop(self):
        return self.items.pop()
    def peek(self):
        return self.items[len(self.items) - 1]
    def size(self):
        return len(self.items)
class BinaryTree:
    def __init__(self, rootObj):
        self.key = rootObj
        self.leftChild = None
        self.rightChild = None
    def insertLeft(self, newNode):
        if self.leftChild == None:
            self.leftChild = BinaryTree(newNode)
        else:
            t = BinaryTree(newNode)
            t.left = self.leftChild
            self.leftChild = t
    def insertRight(self, newNode):
        if self.rightChild == None:
            self.rightChild = BinaryTree(newNode)
        else:
            t = BinaryTree(newNode)
            t.right = self.rightChild
            self.rightChild = t
    def isLeaf(self):
        return ((not self.leftChild) and (not self.rightChild))
    def getRightChild(self):
        return self.rightChild
    def getLeftChild(self):
        return self.leftChild
    def setRootVal(self, obj):
        self.key = obj
    def getRootVal(self, ):
        return self.key
import operator
def buildParseTree(fpexp):
    fplist = fpexp.split()
    pStack = Stack()
    eTree = BinaryTree('')
    pStack.push(eTree)
    currentTree = eTree
    for i in fplist:
        if i == '(':
            currentTree.insertLeft('')
            pStack.push(currentTree)
            currentTree = currentTree.getLeftChild()
        elif i not in ['+', '-', '*', '/', ')']:
            currentTree.setRootVal(int(i))
            parent = pStack.pop()
            currentTree = parent
        elif i in ['+', '-', '*', '/']:
            currentTree.setRootVal(i)
            currentTree.insertRight('')
            pStack.push(currentTree)
            currentTree = currentTree.getRightChild()
        elif i == ')':
            currentTree = pStack.pop()
        else:
            raise ValueError
    return eTree
def evaluate(parseTree):
    opers = {'+': operator.add, '-': operator.sub, '*': operator.mul, '/': operator.truediv}
    leftC = parseTree.getLeftChild()
    rightC = parseTree.getRightChild()
    if leftC and rightC:
        fn = opers[parseTree.getRootVal()]
        return fn(evaluate(leftC), evaluate(rightC))
    else:
        return parseTree.getRootVal()
def postordereval(tree):
    opers = {'+': operator.add, '-': operator.sub, '*': operator.mul, '/': operator.truediv}
    res1 = None
    res2 = None
    if tree:
        res1 = postordereval(tree.getLeftChild())
        res2 = postordereval(tree.getRightChild())
        if res1 and res2:
            return opers[tree.getRootVal()](res1, res2)
        else:
            return tree.getRootVal()
x = input()
pt = buildParseTree(x)
print(evaluate(pt))
print(postordereval(pt))

如何修改才能让没有空格的也能跑起来？

def buildParseTree(fplist ):
    #fplist = fpexp.split()

加个判断，修改代码如下：

class Stack:
    def __init__(self):
        self.items = []

    def isEmpty(self):
        return self.items == []

    def push(self, item):
        self.items.append(item)

    def pop(self):
        return self.items.pop()

    def peek(self):
        return self.items[len(self.items) - 1]

    def size(self):
        return len(self.items)


class BinaryTree:
    def __init__(self, rootObj):
        self.key = rootObj
        self.leftChild = None
        self.rightChild = None

    def insertLeft(self, newNode):
        if self.leftChild == None:
            self.leftChild = BinaryTree(newNode)
        else:
            t = BinaryTree(newNode)
            t.left = self.leftChild
            self.leftChild = t

    def insertRight(self, newNode):
        if self.rightChild == None:
            self.rightChild = BinaryTree(newNode)
        else:
            t = BinaryTree(newNode)
            t.right = self.rightChild
            self.rightChild = t

    def isLeaf(self):
        return ((not self.leftChild) and (not self.rightChild))

    def getRightChild(self):
        return self.rightChild

    def getLeftChild(self):
        return self.leftChild

    def setRootVal(self, obj):
        self.key = obj

    def getRootVal(self, ):
        return self.key


import operator


def buildParseTree(fpexp):
    if " " in fpexp:
        fplist = fpexp.split()
    else:
        fplist = fpexp
    pStack = Stack()
    eTree = BinaryTree('')
    pStack.push(eTree)
    currentTree = eTree
    for i in fplist:
        if i == '(':
            currentTree.insertLeft('')
            pStack.push(currentTree)
            currentTree = currentTree.getLeftChild()
        elif i not in ['+', '-', '*', '/', ')']:
            currentTree.setRootVal(int(i))
            parent = pStack.pop()
            currentTree = parent
        elif i in ['+', '-', '*', '/']:
            currentTree.setRootVal(i)
            currentTree.insertRight('')
            pStack.push(currentTree)
            currentTree = currentTree.getRightChild()
        elif i == ')':
            currentTree = pStack.pop()
        else:
            raise ValueError
    return eTree


def evaluate(parseTree):
    opers = {'+': operator.add, '-': operator.sub, '*': operator.mul, '/': operator.truediv}
    leftC = parseTree.getLeftChild()
    rightC = parseTree.getRightChild()
    if leftC and rightC:
        fn = opers[parseTree.getRootVal()]
        return fn(evaluate(leftC), evaluate(rightC))
    else:
        return parseTree.getRootVal()


def postordereval(tree):
    opers = {'+': operator.add, '-': operator.sub, '*': operator.mul, '/': operator.truediv}
    res1 = None
    res2 = None
    if tree:
        res1 = postordereval(tree.getLeftChild())
        res2 = postordereval(tree.getRightChild())
        if res1 and res2:
            return opers[tree.getRootVal()](res1, res2)
        else:
            return tree.getRootVal()


x = input()
pt = buildParseTree(x)
print(evaluate(pt))
print(postordereval(pt))

# (((2*(3+2))+5)/2)
#( ( ( 2 * ( 3 + 2 ) ) + 5 ) / 2 )

输出为：

( ( ( 2 * ( 3 + 2 ) ) + 5 ) / 2 )
7.5
7.5

(((2*(3+2))+5)/2)
7.5
7.5

如有问题及时沟通