w 2b mode in python

1r for reading
2r+ opens for reading and writing (cannot truncate a file)
3w for writing
4w+ for writing and reading (can truncate a file)
5rb for reading a binary file. The file pointer is placed at the beginning of the file.
6rb+ reading or writing a binary file
7wb+ writing a binary file
8a+ opens for appending
9ab+ Opens a file for both appending and reading in binary. The file pointer is at the end of the file if the file exists. The file opens in the append mode.
10x open for exclusive creation, failing if the file already exists (Python 3)

1
2Here is a list of the different modes of opening a file:
3r
4Opens a file for reading only. The file pointer is placed at the beginning of the file. This is the default mode.
5
6rb
7Opens a file for reading only in binary format. The file pointer is placed at the beginning of the file. This is the default mode.
8
9r+
10Opens a file for both reading and writing. The file pointer will be at the beginning of the file.
11
12rb+
13Opens a file for both reading and writing in binary format. The file pointer will be at the beginning of the file.
14
15w
16Opens a file for writing only. Overwrites the file if the file exists. If the file does not exist, creates a new file for writing.
17
18wb
19Opens a file for writing only in binary format. Overwrites the file if the file exists. If the file does not exist, creates a new file for writing.
20
21w+
22Opens a file for both writing and reading. Overwrites the existing file if the file exists. If the file does not exist, creates a new file for reading and writing.
23
24wb+
25Opens a file for both writing and reading in binary format. Overwrites the existing file if the file exists. If the file does not exist, creates a new file for reading and writing.
26
27a
28Opens 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.
29
30ab
31Opens a file for appending in binary format. 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.
32
33a+
34Opens a file for both appending and reading. The file pointer is at the end of the file if the file exists. The file opens in the append mode. If the file does not exist, it creates a new file for reading and writing.
35
36ab+
37Opens a file for both appending and reading in binary format. The file pointer is at the end of the file if the file exists. The file opens in the append mode. If the file does not exist, it creates a new file for reading and writing.