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python file open modes

r for reading
r+ opens for reading and writing (cannot truncate a file)
w for writing
w+ for writing and reading (can truncate a file)
rb for reading a binary file. The file pointer is placed at the beginning of the file.
rb+ reading or writing a binary file
wb+ writing a binary file
a+ opens for appending
ab+ 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.
x open for exclusive creation, failing if the file already exists (Python 3)
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file handling modes in python

Mode:   Description:
"r"		# Opens a file for reading. (default)
"w"		# Opens a file for writing. Creates a new file if it does not exist or truncates the file if it exists.
"x"		# Opens a file for exclusive creation. If the file already exists, the operation fails.
"a"		# Opens a file for appending at the end of the file without truncating it. Creates a new file if it does not exist.
"t"		# Opens in text mode. (default)
"b"		# Opens in binary mode.
"+"		# Opens a file for updating (reading and writing)
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python file modes

# Different modes of text file
"r" = # Open for reading plain text
"w" = # Open for writing plain text
"a" = # Open an existing file for appending plain text
"rb" = # Open for reading binary data
"wb" = # Open for writing binary data
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