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From Python documentation: ---------------- write( str) Write a string to the file. There is no return value. Due to buffering, the string may not actually show up in the file until the flush() or close() method is called. ---------------- Thus flush() should be used before reading any information just written to a file moreover seek() should be used to reposition the file pointer thus the code should be changed as follows: f = open('c:/test.txt','w+') # open file for updating f.write('Hello World') # write some text to it f.flush() # flush the internal buffer f.seek(0) # reposition file pointer to beginning of file This is important when you need to rewind the pointer f.read() # read the text that was just written