Python:讀文件和寫文件

Python:讀文件和寫文件

1. 寫文件

1. #! /usr/bin/python3
3. 'makeTextFile.py -- create text file'
5. import os
7. def write_file():
8. "used to write a text file."
10. ls = os.linesep
11. #get filename
12. fname = input("Please input filename:")
14. while True:
16. if os.path.exists(fname):
17. print("Error: '%s' already exists" % fname)
18. fname = input("Please input filename:")
19. else:
20. break
22. #get file conent linesOnScreen
23. all = []
24. print("\nEnter lines ('.' to quit).\n")
26. while True:
27. entry = input('>')
28. if entry == '.':
29. break
30. else:
31. all.append(entry)
33. try:
34. fobj = open(fname, 'w')
35. except IOError as err:
36. print('file open error: {0}'.format(err))
38. fobj.writelines(['%s%s' % (x, ls) for x in all])
39. fobj.close()
41. print('WRITE FILE DONE!')
43. return fname

2. 讀文件

1. #! /usr/bin/python3
3. 'readTextFile.py -- read and display text file.'
5. def read_file(filename):
6. 'used to read a text file.'
8. try:
9. fobj = open(filename, 'r')
10. except IOError as err:
11. print('file open error: {0}'.format(err))
12. else:
13. for eachLine in fobj:
14. print(eachLine)
15. fobj.close()

3. 主程序

1. #! /usr/bin/python3
3. 'write_and_read_file.py -- write and read text file.'
5. import makeTextFile
6. import readTextFile
8. if __name__ == '__main__':
10. #wrie file
11. filename = makeTextFile.write_file()
13. #read file
14. readTextFile.read_file(filename)

4.運行結果

1. Python 3.2.2 (default, Sep 4 2011, 09:51:08) [MSC v.1500 32 bit (Intel)] on winxp-duanyx, Standard
2. >>> Please input filename:d:\testpython.log
4. Enter lines ('.' to quit).
6. >this is a test file.
7. >ok ,let us input . to end the content input.
8. >.
9. WRITE FILE DONE!
10. this is a test file.
14. ok ,let us input . to end the content input.
19. >>>