Python- 在不拆分的情况下对文本文件中的数字应用算术

Python- applying arithmetic to numbers in a text file without split

我正在研究从文本文件中获取数字并从数字中减去 255,但保留绝对值。

    def negate(char):
    '''
    absolute value of RGB value - 255
    '''
    line = int(char)
    negate_line = line - 255
    negate_line = abs(negate_line)
    negate_line = str(negate_line)
    return negate_line


`def process_body(infile, outfile, modification):`
    '''

    '''
    for line in infile.readlines():
        line = line.strip()
        for char in line:
            print(char, end="")
            # for debugging purposes. press enter to print next character in line
            input()


            if modification == "apply": 
                negate(line)
                outfile.write(negate)

我知道我应该用字符串方法做一些事情以便自己获取数字,但我一直无法找到不使用 .split 来分隔数字的方法。唯一的字符串方法是 .strip

negate函数中的char应该是我想出一个循环来分隔文本文件中的数字后返回的值,但我目前没有值,因为我还没有想出循环。

文本文件看起来像

0 44 89 0 44 89 0 44 89 0 44 89 1 45 90 
1 45 90 1 45 90 1 45 90 1 45 92 1 45 92 
def negate(num):
'''
absolute value of RGB value - 255
'''
line = int(num)
negate_line = line - 255
negate_line = abs(negate_line)
negate_line = str(negate_line)
return negate_line

def process_body(infile, outfile, modification):
'''

'''

num = ""
space = " "
for line in infile.readlines():
    line = line.strip()
    s = line + space
    for char in line:
        print(char, end="")
        if char == space :
            num += s[num +1]



        # for debugging purposes. press enter to print next character in line
        input() 

        print(num, end="")
        # for debugging purposes. press enter to print next character in line
        input()

        if modification == "negate": 
            negate_line = negate(num)
            outfile.write(negate_line)

        if modification == "high contrast":
            hc = high_contrast(num)
            outfile.write(hc)

我当前的输出是 0

0 4个 04 4个 044

044 8个 0448 9 04489

但我需要得到这样的数字

255 211 166 255 211

所以这不是一个完整的答案,但我不确定出了什么问题