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iomodes: |-
"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).