Mode Meaning
r Open a text file for reading.
w Create a text file for writing.
a Append to a text file.
rb Open a binary file for reading.
wb Create a binary file for writing.
ab Append to a binary file.
r+ Open a text file for read/write.
w+ Create a text file for read/write.
a+ Append or create a text file for read/write.
r+b Open a binary file for read/write.
w+b Create a binary file for read/write.
a+b Append or create a binary file for read/write.
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