sequence of bytes stored on a secondary memory device, such as a disk drive. A file could be a text document or spreadsheet, an html file, or a Python module. Such files are referred to as text files. All files are managed by the file system

the component of a computer system that organizes files and provides ways to create, access, and modify files. provides a uniform view of the files that hides the differences between how files are stored on the different hardware devices.

Files are grouped together into directories or folders. A folder may contain other folders in addition to (regular) files. file system organizes files and folders into a tree structure, typically drawn upside down

The folder on top of the hierarchy is called the root directory. Every folder and file in a file system has a name. However, a name is not sufficient to locate a file efficiently.

Every file can be specified using a pathname that is useful for locating the file efficiently. The file pathname can be specified in two ways.

absolute pathname of a file

consists of the sequence of folders, starting from the root directory, that must be traversed to get to the file. represented as a string, sequence of folders is separated by forward (/) or backward (\) slashes, depending on the operating system.

current working directory

. When using the command shell, the current working directory is typically listed at the shell prompt. When executing a Python module, the current working directory is typically the folder containing the module.

of a file is the sequence of directories that must be traversed, starting from the current working directory, to get to the file.

, which is the folder containing the current working directory. The double-period notation (..)

infile = open(‘example.txt’, ‘r’) Reading mode (default)

Writing mode; if the file already exists, its content is wiped infile = open(‘example.txt’, ‘w’)

Append mode; writes are appended to the end of the file infile = open(‘example.txt’, ‘a’)

file mode read and write

Reading and writing mode (beyond the scope of this book) infile = open(‘example.txt’, ‘r’+)

Text mode (default) infile = open(‘example.txt’, ‘t’) Text files, however, are treated as encoded files using some encoding.

Binary mode infile = open(‘example.txt’, ‘b’) binary files are treated as a sequence of bytes and are not decoded when read or encoded when written to.

The open() function returns an object of an Input or Output Stream type that supports methods to read and/or write characters. Different modes will give us file objects of different file types. the file type will support all or some of the methods

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python files

Question	Answer
file definition	sequence of bytes stored on a secondary memory device, such as a disk drive. A file could be a text document or spreadsheet, an html file, or a Python module. Such files are referred to as text files. All files are managed by the file system
file system	the component of a computer system that organizes files and provides ways to create, access, and modify files. provides a uniform view of the files that hides the differences between how files are stored on the different hardware devices.
directories	Files are grouped together into directories or folders. A folder may contain other folders in addition to (regular) files. file system organizes files and folders into a tree structure, typically drawn upside down
root directory	The folder on top of the hierarchy is called the root directory. Every folder and file in a file system has a name. However, a name is not sufficient to locate a file efficiently.
pathname	Every file can be specified using a pathname that is useful for locating the file efficiently. The file pathname can be specified in two ways.
absolute pathname of a file	consists of the sequence of folders, starting from the root directory, that must be traversed to get to the file. represented as a string, sequence of folders is separated by forward (/) or backward (\) slashes, depending on the operating system.
current working directory	. When using the command shell, the current working directory is typically listed at the shell prompt. When executing a Python module, the current working directory is typically the folder containing the module.
relative pathname	of a file is the sequence of directories that must be traversed, starting from the current working directory, to get to the file.
parent folder	, which is the folder containing the current working directory. The double-period notation (..)
file mode read	infile = open(‘example.txt’, ‘r’) Reading mode (default)
file mode write	Writing mode; if the file already exists, its content is wiped infile = open(‘example.txt’, ‘w’)
file mode append	Append mode; writes are appended to the end of the file infile = open(‘example.txt’, ‘a’)
file mode read and write	Reading and writing mode (beyond the scope of this book) infile = open(‘example.txt’, ‘r’+)
file mode text	Text mode (default) infile = open(‘example.txt’, ‘t’) Text files, however, are treated as encoded files using some encoding.
file mode binary	Binary mode infile = open(‘example.txt’, ‘b’) binary files are treated as a sequence of bytes and are not decoded when read or encoded when written to.
file object	The open() function returns an object of an Input or Output Stream type that supports methods to read and/or write characters. Different modes will give us file objects of different file types. the file type will support all or some of the methods

Created by: kbaldwin

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