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r Read-only, starts at beginning of file (default mode).
r+ Read-write, starts at beginning of file.
w Write-only, truncates existing file to zero length or creates a new file for writing.
w+ Read-write, truncates existing file to zero length or creates a new file for reading and writing.
a Write-only, starts at end of file if file exists, otherwise creates a new file for writing.
a+ Read-write, starts at end of file if file exists, otherwise creates a new file for reading and writing.
b (DOS/Windows only) Binary file mode (may appear with any of the key letters listed above).