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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