2.3.9
File Handling
File Handling
File Handling
We must be careful with the way that we access files so that we do not accidentally corrupt them.
Open the file
Open the file
- First we open the file for use, so that the operating system knows that we are using it.
- We can do this using:
- open("filename.txt", "r")
- open("filename.txt", "w")
- Opening with "r" will allow you read access to the file.
- Opening with "w" will allow you write access to the file.
Assign the file to a variable
Assign the file to a variable
- The file must be assigned to a variable so that we can keep refering to it.
- This can be done as follows:
- myFile = open("filename.txt", "r")
- myFile = open("filename.txt", "w")
Read / write
Read / write
- We can now read or write to the file using the following commands:
- myFile.readline() will return the next line of a file as a string.
- myFile.write(
) will write a line to the file.
Close the file
Close the file
- Finally we must close the file so that it is free for another program to access.
- We can do this using:
- myFile.close()
1Computational Thinking & Algorithms
1.1Computational Thinking
1.2Algorithms
1.2.1Algorithms
1.2.2Pseudocode
1.2.3Flow Diagrams
1.2.4Logical Reasoning & Debugging
1.2.5Reading Algorithms
1.2.6Correcting Algorithms
1.2.7Complete the Algorithm
1.2.8Search Algorithms
1.2.9Linear Search
1.2.10Binary Search
1.2.11Sort Algorithms
1.2.12Bubble Sort
1.2.13Insertion Sort
1.2.14End of Topic Test - Algorithms
2Programming
2.1Programming Fundamentals
2.1.1Variables & Constants
2.1.2Comments
2.1.3Input & Output
2.1.4Arithmetic Operators
2.1.5Relational Operators
2.1.6Boolean Operators
2.1.7Sequence
2.1.8Selection
2.1.9Iteration
2.1.10Subroutines
2.1.11Scope
2.1.12Data Types
2.1.13Casting
2.1.14Arrays
2.1.152D Arrays
2.1.16Lists
2.1.172D Lists
2.1.18Strings
2.1.19Syntax Errors
2.1.20Logic Errors
2.1.21Runtime Errors
2.1.22End of Topic Test - Programming
2.2Designing Code
3Hardware & Software
3.1Hardware
3.2Software
4Data
5The Internet
6Online Safety & Security
6.1Protecting Yourself Online
Jump to other topics
1Computational Thinking & Algorithms
1.1Computational Thinking
1.2Algorithms
1.2.1Algorithms
1.2.2Pseudocode
1.2.3Flow Diagrams
1.2.4Logical Reasoning & Debugging
1.2.5Reading Algorithms
1.2.6Correcting Algorithms
1.2.7Complete the Algorithm
1.2.8Search Algorithms
1.2.9Linear Search
1.2.10Binary Search
1.2.11Sort Algorithms
1.2.12Bubble Sort
1.2.13Insertion Sort
1.2.14End of Topic Test - Algorithms
2Programming
2.1Programming Fundamentals
2.1.1Variables & Constants
2.1.2Comments
2.1.3Input & Output
2.1.4Arithmetic Operators
2.1.5Relational Operators
2.1.6Boolean Operators
2.1.7Sequence
2.1.8Selection
2.1.9Iteration
2.1.10Subroutines
2.1.11Scope
2.1.12Data Types
2.1.13Casting
2.1.14Arrays
2.1.152D Arrays
2.1.16Lists
2.1.172D Lists
2.1.18Strings
2.1.19Syntax Errors
2.1.20Logic Errors
2.1.21Runtime Errors
2.1.22End of Topic Test - Programming
2.2Designing Code
3Hardware & Software
3.1Hardware
3.2Software
4Data
5The Internet
6Online Safety & Security
6.1Protecting Yourself Online
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