在文件中进行算术操作

# 处理算数，并返回结果

def handleArithmetic(str):

# 去除等于号

arithmetic = str.split(‘=’)[0]

# 标记运算符  0为- 1为+

operator = 0

for ar in arithmetic:

if(ar ==’+’):

operator = 1

elif(ar ==’-‘):

operator = 0

if(operator ==0):

arithmeticList = arithmetic.split(‘-‘)

return (int(arithmeticList[0]) – int(arithmeticList[1]))

elif(operator==1):

arithmeticList = arithmetic.split(‘+’)

return (int(arithmeticList[0]) + int(arithmeticList[1]))

 

 

# 程序主入口

def main():

# 打开新文件，如果没有就创建一个

resultFile = open(‘E:\\test_calc_result.txt’,’w’)

with open(‘E:\\test_calc.txt’,’r’) as file:

# 读取文件行数,返回每行数据

lines = file.readlines()

# print(lines)

 

for line in lines:

# 去除换行符

lineNew = line.split(‘\n’)[0]

result =str(handleArithmetic(lineNew))

# 产生新的式子

newStr = lineNew+result

# 将文件写入新文件

resultFile.write(newStr+’\n’)

# 关闭文件

resultFile.close()

main()