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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