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- [Instructor] Just a quick
overview of some file concepts

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before we begin.

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In Python, it views a text file

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simply as a sequence of characters,

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and the first position in the file

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is the character at position zero,

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so it's kind of like indexing
through a list, for example.

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Python also does support binary files,

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which are simply sequences of bytes,

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and the first byte in the file
would be at position zero,

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and you might use binary
files, for example,

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for things like images or videos.

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And there are some standard file objects

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that are pre-defined for
you if you need them.

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You can access them

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through the Python standard
library's sys module.

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We have sys.stdin for the
standard input stream,

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and even though it's
referred to as a file object,

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by default, the standard
input stream reads input

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from the command line,
although you can redirect it

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to get input, for example, from a file.

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And then separately, the
standard output stream

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and the standard error streams

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are going to display information

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at the command line by default,

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but again, those also can be redirected.