python 对txt中每行内容进行批量替换 对多个txt处理 替换txt中一个元素并另存为txt

f = open('./v al.txt')
lines = f.readlines() #整行读取
f.close()
for line in lines:
    rs = line.rstrip('\n') #去除原来每行后面的换行符，但有可能是\r或\r\n
    newname=rs.replace(rs,'/JPEGImages/'+rs+'.jpg'+' '+'/SegmentationClassAug/'+rs+'.png')
    newfile=open('. val1.txt','a')
    newfile.write(newname+'\n')
    newfile.close()

在此记录下，用python将layout下的xml文件中的@dimen/dpxxx改为(xxx/3)dp。

批量替换文件夹下文件中某个字符

import os, shutil,re

if __name__=='__main__':
    work_dir = 'C:\\Users\\Desktop\\workspace\\app\\src\\main\\res\\layout'
    new_dir = 'C:\\Users\\Desktop\\layout_test\\'
    for parent, dirnames, filenames in os.walk(work_dir,  followlinks=True):
        for filename in filenames:
            file_path = os.path.join(parent, filename)
            file = open(file_path,"r+",encoding='UTF-8')
            newFile = open(new_dir+filename,"w",encoding='UTF-8')
            for line in file.readlines():
                if("@dimen/dp" in line):
                    num = re.sub("\D", "", line)
                    newNum = int(num)/3
                    newNum = ("%.1f" % newNum)
                    ori = line.split("\"")
                    line = line.replace(ori[1],str(newNum)+"dp")
                newFile.writelines(line)
            print (filename)
            newFile.close()
            file.close()

批量替换某个类名

import os, shutil,re

if __name__=='__main__':

    work_dir = 'F:\\p1\\annotations'
    new_dir = 'F:\\p1\\annotations_ship\\'
    for parent, dirnames, filenames in os.walk(work_dir,  followlinks=True):
        for filename in filenames:
            file_path = os.path.join(parent, filename)
            file = open(file_path,"r+",encoding='UTF-8')
            newFile = open(new_dir+'ship'+filename[4:],"w",encoding='UTF-8')
            for line in file.readlines():
                if("boat" in line):
                    line = line.replace("boat","ship")
                newFile.writelines(line)
            print (filename)
            newFile.close()
            file.close()

替换数据集的标签 另存

import os
path = r'C:\D\car_dataset\mark'  # txt文件存放路径
sv_path = r'C:\D\car_dataset\labels'  # 修改后的txt文件存放路径
files = os.listdir(path)
for txtFile in files:
    txt_ab_route=path+"\\" + txtFile
    write_ab_route=sv_path+"\\" + txtFile
    # print(write_ab_route)
    with open(txt_ab_route,'r') as txt:  #'r+'表示对文件是进行"读取和写入的模式"
        old_str = txt.read()
        new_str='0'+old_str[1:-1]
        # print(new_str)
        # print(old_str)
        txt.close()
    f = open(write_ab_route,"a")   #a表示没有该文件就新建
    f.write(new_str)		#写入文件
    f.close()		#执行完结束