File Mode Operation
r Open for read
rU or U Open for read with universal NEWLINE support (PEP 278)
W Open for write (truncate if necessary)
A Open for append (always works from EOF, create if necessary)
r+ Open for read and write
w+ Open for read and write (see w above)
a+ Open for read and write (see a above)
Rb Open for binary read
Wb Open for binary write (see w above)
ab Open for binary append (see a above)
rb+ Open for binary read and write (see r+ above)
wb+ Open for binary read and write (see w+ above)
ab+ Open for binary read and write (see a+ above)
Here are some examples for opening files:
fp = open('/etc/motd') #open file for read
fp = open('test', 'w') #open file for write
fp = open('data', 'r+') #open file for read/write
fp = open(r'c:\io.sys', 'rb') #open binary file for read
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