项目托管平台地址：https://gitee.com/j1001/KeXueJiSuanQi/blob/master/README.md
开发模块功能:
计算功能，开发时间：一天# -*- encoding: utf-8 -*-
def md(l,x):
a = l.index(x)
if x == \'*\' and l[a + 1] != \'-\':
k = float(l[a - 1]) * float(l[a + 1])
elif x == \'/\' and l[a + 1] != \'-\':
k = float(l[a - 1]) / float(l[a + 1])
elif x == \'*\' and l[a + 1] == \'-\':
k = -(float(l[a - 1]) * float(l[a + 2]))
elif x == \'/\' and l[a + 1] == \'-\':
k = -(float(l[a - 1]) / float(l[a + 2]))
del l[a - 1], l[a - 1], l[a - 1]
l.insert(a - 1, str(k))
return l
def fun(s):
l = re.findall(\'([\d\.]+|/|-|\+|\*)\',s)
sum=0
while 1:
if \'*\' in l and \'/\' not in l:
md(l, \'*\')
elif \'*\' not in l and \'/\' in l:
md(l, \'/\')
elif \'*\' in l and \'/\' in l:
a = l.index(\'*\')
b = l.index(\'/\')
if a < b:
md(l, \'*\')
else:
md(l, \'/\')
else:
if l[0]==\'-\':
l[0]=l[0]+l[1]
del l[1]
sum += float(l[0])
for i in range(1, len(l), 2):
if l[i] == \'+\' and l[i + 1] != \'-\':
sum += float(l[i + 1])
elif l[i] == \'+\' and l[i + 1] == \'-\':
sum -= float(l[i + 2])
elif l[i] == \'-\' and l[i + 1] == \'-\':
sum += float(l[i + 2])
elif l[i] == \'-\' and l[i + 1] != \'-\':
sum -= float(l[i + 1])
break
return sum
实现运算过程
def calculate(expression):
ex=[]
ans=0
if \'(\' not in expression:
ans=fun(expression)
return ans
for i in range(len(expression)):
if expression[i]==\'(\':
ex.append(i)
elif expression[i]==\')\':
temp=0
sub=expression[ex[len(ex)-1]+1:i]
temp=fun(sub)
expression=expression[0:ex[len(ex)-1]]+str(temp)+expression[i+1:len(expression)+1]
ex.pop()
return calculate(expression)
s=\'1 - 2 * ( (60-30 +(-40/5+3) * (9-2*5/3 + 7 /3*99/4*2998 +10 * 568/14 )) - (-4*3)/ (16-3*2) )\'
print(1 - 2 * ( (60-30 +(-40/5+3) * (9-2*5/3 + 7 /3*99/4*2998 +10 * 568/14 )) - (-4*3)/ (16-3*2) ))
s3=\'3*(4+50)-((100+40)*5/2-3*2*2/4+9)*(((3+4)-4)-4)\'
print(3*(4+50)-((100+40)*5/2-3*2*2/4+9)*(((3+4)-4)-4))
print(calculate(s))
print(calculate(s3))
遇到的问题和解决办法：实现过程中会出现错误，现在还未解决。