Python Open File (File Open)

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chapter

• Python Introduction
• Python development environment to build
• Python syntax
• Python variables
• Python Value Type
• Python type conversion
• Python String (String)
• Operators Python
• Python list (list)
• Python tuples (Tuple)
• Python collection (Set)
• Python dictionary (Dictionary)
• Python If … Else
• Python While loop
• Python For loop
• Python functions
• Python Lambda
• Python Classes and Objects
• Python inheritance
• Python iterator (Iterator)
• Python module
• Python date (Datetime)
• Python JSON
• Python regular expression (RegEx)
• Python PIP package manager
• Python exception handling (Try ... Except)
• Python Open File (File Open)
• Python read file
• Python write file
• Python delete files and folders

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File handling is an important part of the application.

Python is included to create, read, update and delete files function.

File Handling

The key document processing functions in Python is a open()function.

open()Function takes two filenameparameters: ,mode

Open the file mode (mode) There are four kinds:

• r - read-only mode is the default, if the file does not exist error
• a - append mode, you can open the file in append the contents of a file, if the file does not exist, create the file
• w - write mode, open the file content is written, if the file does not exist, create the file
• x - Create a file, create a file, if the file exists, an error is returned

In addition, you can specify the file processing in binary mode or text mode

• t - Text mode, the default value
• b - binary pattern (e.g., video)

grammar

To open a file for reading, just pass the filename:

f = open("test.txt")

The above code is equivalent to:

f = open("test.txt", "rt")

Because r(read-only) and t(text) is the default, so you can not specify.

Note : Make sure the file exists, otherwise the program will report an error.