اسلاید دوم جلسه هفتم کلاس پایتون برای هکرهای قانونی
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This document discusses file handling in Python. It covers opening, reading, writing, and closing files using functions like open(), read(), write(), and close(). It demonstrates creating a file, appending to it, and reading it line by line. It also shows renaming and removing files using the os module functions os.rename() and os.remove(). The full list of file access modes like read, write, and append are also described.
اسلاید دوم جلسه هفتم کلاس پایتون برای هکرهای قانونی
- 1. Python for Ethical Hackers Mohammad reza Kamalifard
- 2. Python Language Essentials Module 2: System Programming Part 1 : File Handling
- 3. File I/O in Python open (file_name,access_mode,buffering) read(byte_count) write(data) close() os.rename() os.remove()
- 4. File access modes r Opens a file for reading only. The file pointer is placed at the beginning of the file. This is the default mode. w Opens a file for writing only. Overwrites the file if the file exists. If the file does not exist, creates a new file for writing. a Opens a file for appending. The file pointer is at the end of the file if the file exists. That is, the file is in the append mode. If the file does not exist, it creates a new file for writing. Full list : http://www.tutorialspoint.com/python/python_files_io.htm
- 5. Creating File >>> file = open('pysec.txt', 'w') >>> file <open file 'pysec.txt', mode 'w' at 0x7f3e7c8dc4b0> >>> for count in range(0,100): ... file.write(str(count) + 'n') ... >>> file.close() >>>
- 7. Append to File >>> file = open('pysec.txt', 'a') >>> file <open file 'pysec.txt', mode 'w' at 0x7f3e7c8dc4b0> >>> for count in range(100,200): ... file.write(str(count) + 'n') ... >>> file.close() >>>
- 9. read file >>> file = open('pysec.txt','r') >>> for line in file.readlines(): ... print line.strip() ... 0 1 2 3 4 . . 196 197 198 199
- 10. rename file and remove file >>> import os >>> os.rename('pysec.txt', 'pysec101.txt') >>> $ $ ls code pysec101.txt pres_file handling.txt os.remove(file_name) >>> import os >>>os.remove('pysec101.txt') $ $ ls code pres_file handling.txt
- 11. This work is licensed under the Creative Commons Attribution-NoDerivs 3.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by-nd/3.0/ Copyright 2013 Mohammad reza Kamalifard. All rights reserved.