[Tutor] File mode r+

[Shitiz Bansal]

Hi,
I want to update a textfile using the r+ file mode.
contents of file:

abcd
efgh
ijkl
mnop
qrst
uvwx
yx12

my scripts is:

file1=open("aa.txt",'r+')
file1.readline()
file1.readline()
file1.write("1234\n")
file1.close()

This should replace the third line with 1234.
However it does nothing.

Moreover the script:

file1=open("aa.txt",'r+')
file1.write("1234\n")
file1.close()

does replace the first line with 1234.

could anyone explain what is happening?

shitiz

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