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Questions and Answers
What is the default file mode when opening a file for reading?
What is the default file mode when opening a file for reading?
What method is used to read the entire file?
What method is used to read the entire file?
What is the purpose of the close() method?
What is the purpose of the close() method?
What is the best practice when working with files?
What is the best practice when working with files?
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What file mode is used to write to a file and truncate it if it exists?
What file mode is used to write to a file and truncate it if it exists?
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What method is used to write a string to the file?
What method is used to write a string to the file?
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What does the '+' symbol indicate in a file mode?
What does the '+' symbol indicate in a file mode?
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What is the default mode when opening a file without specifying a mode?
What is the default mode when opening a file without specifying a mode?
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What file mode is used to append to a file?
What file mode is used to append to a file?
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What happens to a file if it exists when you open it in write mode with the 'w' argument?
What happens to a file if it exists when you open it in write mode with the 'w' argument?
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What is added to the end of the string when using the write() method?
What is added to the end of the string when using the write() method?
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What happens if you use the 'x' file mode and the file already exists?
What happens if you use the 'x' file mode and the file already exists?
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What is the purpose of using a with statement when writing to a file?
What is the purpose of using a with statement when writing to a file?
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What is the benefit of specifying the encoding when opening a file?
What is the benefit of specifying the encoding when opening a file?
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What is the result of multiple write() method calls?
What is the result of multiple write() method calls?
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What is the purpose of the 'a' file mode?
What is the purpose of the 'a' file mode?
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Study Notes
Reading and Writing Files
- Opening a file for reading:
- Use
open()function with'r'mode (default) - Example:
file = open('example.txt', 'r')
- Use
Reading File Contents
- Read entire file:
read()method - Read a single line:
readline()method - Read all lines into a list:
readlines()method
Closing the File
- Use
close()method to close the file - Example:
file.close() - Best practice: Use
withstatement to automatically close the file - Example:
with open('example.txt', 'r') as file:...
Writing Files
- Opening a file for writing:
- Use
open()function with'w'mode (truncates the file if it exists) - Example:
file = open('example.txt', 'w')
- Use
Writing to the File
- Write a string to the file:
write()method - Example:
file.write('Hello, World!') - Writing multiple lines: use multiple
write()calls - Example:
with open('example.txt', 'w') as file:
file.write('This is the first line.\n')
file.write('This is the second line.')
File Modes
- Read-only mode:
'r' - Write-only mode:
'w' - Append mode:
'a' - Read and write mode:
'r+' - Write and read mode:
'w+' - Append and read mode:
'a+' - Binary mode:
'rb','wb','ab','r+b','w+b','a+b' - Text mode:
'r','w','a','r+','w+','a+'(default) - Note:
+indicates both reading and writing are allowed
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Description
Learn how to open, read, and close files in Python. Understand the different file modes and methods for reading file contents.
