项目托管平台地址:https://gitee.com/Marly/codes/vbnfqyx3mzpsk8062rc9e77
模块测试:
不带括号fun功能,

代码部分：

• 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

  s='1+1+1+2+3+45+6/6+6*9'
  print(1+1+1+2+3+45+6/6+6*9)

• 测试:s='1+1+1+2+3+45+6/6+6*9'
  　　print(1+1+1+2+3+45+6/6+6*9)

calculate功能

代码：

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()

测试方法:

s='(5+5)+5*5/25-8+9'
print((5+5)+5*5/25-8+9)