>> s=str(a) >>> f.write(s) and the key.txt file remains empt...">
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Error writing data to file in python

 a='aa'
>>> f=open("key.txt","w")


>>> s=str(a)
>>> f.write(s)

and the key.txt file remains empty .. why?

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2 answers


Use

f.flush()

to clear the write to disk. Or, if you ended up with with f

, you can use



f.close()

to clear and close the file.

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This problem can be completely eliminated by using the with statement : 

with open("key.txt","w") as f:
    s=str(a)
    f.write(s)


The file will be automatically closed when the block is finished. By using with instruction , you don't need to worry about this type of errors creeping into your code.

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