python对文档中元素删除,替换操作

with open('E:\\桌面\\train.txt', 'r') as f:
    lines = f.readlines()
​
with open('E:\\桌面\\1704.txt', 'a') as ff: # 此处 w 和 a，均可，反正是新建的临时文件，文件不存在时会自动创建
    for line in lines:
        # kv = line.strip().split(' ')
        kv = line.split(' ')
        # kv[2] = kv[2]*100
        m = float(kv[2])
        m = round(m * 100, 1)
        if kv[2]:
            line = line.replace(kv[2], str(m))
        ff.write(line)
​
# shutil.move('123.yml', 'apktool.yml')

##改变或者删除txt文档中某一列
import re
with open('E:\\桌面\\train.txt', 'r') as f: ##最开始要改变的文档
    lines = f.readlines()
    # for line in lines:
    #     line = re.split(' |  ', line)
    #     print(line)
l = []
for line in lines:
    # kv = line.strip().split(' ')
    kv = line.strip(" ").split(' ')
    kv.pop(3)
    kv.pop(3)
    # print(kv)
    l.append(kv)
    # print(l)
with open('E:\\桌面\\1706.txt', 'a') as ff: # 此处 w 和 a，均可，反正是新建的临时文件，文件不存在时会自动创建
    for i in l:
        print(i)
        for i1 in i:
            ff.write(i1)  # 写入
            ff.write(' ')  # 有时放在循环里面需要自动转行，不然会覆盖上一条数据
ff.close()
with open('E:\\桌面\\1706.txt', 'r') as fff:  ##读取临时文档
    lines1 = fff.readlines()
with open('E:\\桌面\\1707.txt', 'a') as ffff:  ###创建最后的要求的文档
    for line in lines1:
        i2 = line.strip(" ").split(' ')
        n = float(i2[2])
        m = round(n * 100, 1)
        line = line.replace(i2[2], str(m))
        ffff.write(line)
​
        #
        # line = i.replace(i[2], str(m))
        # print(line)
        # ff.write(line)
​
​
    # for line in lines:
    #     # kv = line.strip().split(' ')
    #     kv = line.split(' ')
    #     kv.pop(3)
    #     kv.pop(4)
    #     # print(kv)
    #     l.append(kv)
    #     print(l)
    #
    #
    #     # m = float(kv[2])
    #     # m = round(m * 100, 1)
    #     # print(kv)
    #     # line = line.replace(kv[2], str(m))
    #     # print(line)
    #     # # line = line.replace(kv[3], '', 1)
    #     # # line = line.replace(kv[4], '', 1)
    #     # ff.write(line)
    #
    #