团队-科学计算器-模块开发过程

Posted 2020-10-12 Shine`艳

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。