【python初识】文件存储与异常

文件存储与异常

1、打开关闭文件

import os
if os.path.exists('sketch.txt'):
  the_file = open('sketch.txt')
  print(the_file.readline(),end=' '
  the_file.close()
else:
  print('the data is missing')

2、split函数

for each_line in data:
  if not each_line.find(':') == -1
    (role,line_spoken) = each_line.split(':',1) #分成两部分

3、异常处理

try:
  the_file = open('sketch.txt')
  print(the_file.readline(),end=' '
except IOError:
  print('the data is missing')
finally:
   the_file.close()

try:
  with open ('it.txt',"w") as data:
  print("aag",file = data)
except IOError as err:
  print("File error:" + str(err) )

4、strip函数

(role,line_spoken) = each_line.split(':',1)
line_spoken = line_spoken.srep() #从字符串去除不想要的字符

5、写入文件

out = open("data.out",'w')
print("NOR iii",file = out)
out.close()

6、保存文件

import pickle 

with open('mydata.pickle','wb') as msd
  pickle.dump([1,2,'t'],msd)

with open('mydata.pickle','rb') as mrd
  mlist = pickle.load(mrd)

print(mlist)