Python读取Fi时的子串比较

Question

我正在编写一个python程序，将以下行（大约10000行）从一个文件复制到另一个文件。条件是，若lwz中的源寄存器和目标寄存器相同，则将该行加粗并复制。否则干脆照搬

Line 850:   lwz     r3, 0(r17)
Line 851:   1004f0: 80 71 00 00     lwz r3,0(r17)
Line 1039:  lwz r5,0(r3)
Line 1040:   100598:    80 a3 00 00     lwz r5,0(r3)
Line 2029:     lwz     r9, 0(r4)               /* load half word from source */
Line 2030:   1009f8:    81 24 00 00     lwz r9,0(r4)
Line 2126:   100a5c:    81 3f 00 10     lwz r9,16(r31)
Line 2131:   100a68:    80 1f 00 10     lwz r0,16(r31)

我写了下面的程序来从一个文件复制行到另一个文件

import os
import sys
f1 = open('test.txt')
f2 = open('Output.txt', 'w')
str2 = "r9";
i=0
while i < 10:
     Lines=f1.readline()
     #Here I dont know
     f2.write(str(Lines))
     i=i+1;
f1.close()
f2.close()

有谁能建议如何将从文件中读取的行转换成字符串，以便我可以对其应用字符串操作。当我直接应用时，它会出错

Answer 1

假设您使用的是Python3，并且假设您的文件是csv格式，tabulator符号是分隔符：

with open('text.txt', 'r', encoding='utf-8') as left_file:
    with open('Output.txt', 'w',  encoding='utf-8') as right_file:

        for left_line, right_line in zip(left_file, right_file):
            left_cols = left_line.split('\t')
            right_cols = right_cols.split('\t')
            if left_cols[-1] == right_cols[-1]:
                # make text bold
                ...

Answer 2

您可以迭代文件中的行：

with open("test.txt","r") as f1:
    with open("Output.txt","w") as f2:
        for line in f1:
             dosomethingwith(line)
             f2.write(line)