python文件-谁可以完全打开

时间:2019-01-16 22:21:21

标签: python python-2.7 file math

我们的文件存在一些数学问题,例如:46 + 19(仅+或-,并且以这种方式建立:数字,空格,符号,空格,数字),我们需要将其转换为新文件并解决它们(46 + 19 = 65)。我们不知道将进行多少次练习,也不知道每个数字中的位数。这是我的代码:

enter code here
input_file = open(r'C:\try\bla.txt', 'r')
nums = input_file.read()

y = 0
dig1 = ''
dig2 = ''
sign = ''
x1 = nums.find(' ')
x2 = x1 + 1

def one(dig1, dig2, y):
    for i in xrange(x1):
        dig1 += nums[y]
        y += 1

    for m in xrange(abs(-x2)):
        dig2 += nums[y + 1]
    y += 1

sign = nums[x2]

if sign == '+':
    sum = int(dig1) + int(dig2)

if sign == '-':
    sum = int(dig1) - int(dig2)

print dig1, dig2, '=', sum


for a in xrange(0):
    one(dig1, dig2, y)

one(dig1, dig2, y)
print 'f', nums[21]
#print dig1, dig2, '=', sum

1 个答案:

答案 0 :(得分:0)

也许你想得到这个(python3):

test.txt:
10 + 15
22 - 71
33 + 64

代码:

import operator
op = {'+': operator.add, '-': operator.sub}

with open('test.txt', 'r') as f:
    lines = f.readlines()

for i in lines:
    args = i.split()
    val = op[args[1]](int(args[0]), int(args[-1]))
    r = f'{i.strip()} = {val}'
    print(r)