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I am passing a file object as an argument to a function in Python. Inside this function I want to read the content of the file passed as an argument.

Will I be able to read the file from the beginning or will it continue from the last line read before passing it to the current function ?

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    from the next line... Commented Jun 26, 2015 at 18:58
  • It is easy to test... Commented Jun 26, 2015 at 19:04

4 Answers 4

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This is something you could easily find out yourself by testing. The filehandle remembers it's current line so it will continue reading where it left of.

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I wish I could upvote this answer twice or more - why do people waiste everyone's time asking questions they could answer by themselves in less time than they spent posting the question, I really wonder...
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I haven't coded in python much, but I would assume that the parameter you passed in is actually a reference to the object, which means that it should read from the next line. See this post for clarification.

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File objects are generators, so they will continue from the next line.

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"Hence why you can't use them once read or readlines has been called" : you may want to read about file.seek(0).
"they will continue from the next line. " : unless you call .seek(0) which will reset the pointer at the beginning of the file
"it will continue where it left off" unless you reset the file pointer using file.seek()
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You might find https://docs.python.org/2/tutorial/inputoutput.html#methods-of-file-objects helpful. The file object keeps track of where it is.

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