assign之python文本处理

需求：

code:

import os
import time
import numpy as np


def to_log_txt(filename):
    if not os.path.exists('Out_file'):
        os.makedirs('Out_file')

    filename = filename + '.txt'
    with open(filename, 'r', newline='') as f:
        for line in f.readlines():
            with open(filename, 'r', newline='') as w:
                line_data = line.strip().split(',')
                if len(line_data) == 6:
                    pass



def to_error_txt(filename):
    input_filename = filename + '.txt'
    with open(input_filename, 'r', newline='') as f:
        if not os.path.exists('Out_file'):
            os.makedirs('Out_file')
        output_filename = filename + '_error.txt'
        out_path = 'Out_file/' + output_filename
        with open(out_path, 'w', newline='') as w:
            flag = 1
            for line in f.readlines()[1:]:
                line_data = line.strip().split(',')
                if len(line_data) != 6:
                    w.write('Line '+ str(flag) + ' in error: ' + line)

                if len(line_data[0]) != 6:
                    if len(line_data) != 6:
                        pass
                    else:
                        w.write('Line '+ str(flag) + ' in error: ' + line)
                flag+=1
            w.close()
        f.close()



def to_grade_txt(filename):
    input_filename = filename + '.txt'
    with open(input_filename, 'r', newline='') as f:
        if not os.path.exists('Out_file'):
            os.makedirs('Out_file')
        output_filename = filename + '_grade.txt'
        out_path = 'Out_file/' + output_filename
        with open(out_path, 'w', newline='') as w:
            w.writelines("                     ***************                    " + '\n')
            w.writelines("                     Students Result                    " + '\n')
            w.writelines("                     ***************                    " + '\n')
            w.writelines("Student Id      Name                          Total Mark" + '\n')
            w.writelines("----------      ----                          ----------" + '\n')
            remain_data = []
            for line in f.readlines()[1:]:
                line_data = line.strip().split(',')
                if len(line_data) != 6:
                    pass
                elif len(line_data[0]) != 6:
                    pass
                else:
                    remain_data.append(line_data)
            for i in range(len(remain_data)):
                id = remain_data[i][0]
                name = str(remain_data[i][1]) + ' ' + str(remain_data[i][2])
                total_mark = float(remain_data[i][-3]) + float(remain_data[i][-2]) + float(remain_data[i][-1])
                if i == 0:
                    pass
                else:
                    w.writelines(str(id) + "       " + name + "       " + str(total_mark) + '\n')
            w.close()
        f.close()


if __name__ == '__main__':
    filename = input('Enter the input filename without extension (X to exit):')
    to_grade_txt(filename)

result:

get:

1.python在处理文本时，在遇到列表中的两数相加时，需要先将其转化为float类型；若转换失败，多半是因为float在转换int与string或str时，字符串中不允许存在空格或者引号

2.read与readlines；write与writelines的区别：

  file.write(str)的参数是一个字符串，就是你要写入文件的内容.
  file.writelines(sequence)的参数是序列，比如列表，它会迭代帮你写入文件。当然 也可以使字符串，但是要换行需尾加'\n'