pthon更换文档中某元素：

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')

python改变或者删除txt文档中某一列元素

##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)
  #
  #

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