python实现输入数字的连续加减方法

s=input("请输入要运算的数字")
print("The result is{}".format(eval(s)))

s=input("请输入要运算的数字")
l=len(s)
h=0
i=0
flag=1
a=0
for i in range(0,l):
 if s[i]=='+' or s[i]=='-':
  flag=1
  c=s[i]
 else:
  flag=0
  a=a*10+round(int(s[i]))
 if flag==1 and s[i]=='+':
  h+=a
  a=0
 elif flag==1 and s[i]=='-':
  h-=a
  a=0
print(h)

s=input("请输入要运算的数字")
l=len(s)
h=0
i=0
while i<=l:
 a=0
 c=s[i]
 i+=1
 while s[i]!='+' and s[i]!='-' and i<=l :
  a=a*10+round(int(s[i]))
  i+=1
 if c=='+':
  h+=a
 else:
  h-=a
print(h)

#错误类型：IndexError: string index out of range（字符串越界） 

s=input("请输入要运算的数字")
l=len(s)-1
h=0
i=0
while i<=l:
 a=0
 c=s[i]
 i+=1
 while i<=l and s[i]!='+' and s[i]!='-' :
  a=a*10+round(int(s[i]))
  i+=1
 if c=='+':
  h+=a
 else:
  h-=a
print(h)