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Why is a StringIO object slower than a real object?

I am looking through a source StringIOwhere a few comments are made:

  • Using a real file is often faster (but less convenient) .
  • There is also a faster implementation in C called cStringIO, but these are not subclasses.

StringIO as an object of a memory file, why is it slower than a real file?

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3 answers

Python File Handling is fully implemented in the C . This means that it is pretty fast (at least in the same order as its own C code).

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* Well, version B _pyio, anyway. The standard version of the library is iowritten in C.

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