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Linear Algebra
52 guides
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1. Vectors
2. Matrices
3. Linear equations
4. Matrix determinant
5. Vector space
6. Special matrices
7. Eigenvalues and Eigenvectors
8. Orthogonality
9. Matrix decomposition
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schedule Mar 5, 2023
Last updated
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Python
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Python's `file.readline(~)` method returns one line from the file and leaves a newline character `\n` at the end of the string (omitted from the last line of the file).

Parameters

1. `size` | `number` | `optional`

The number of bytes from the line to return. Default is to read whole line.

Return value

One line from the file as a string.

Examples

To return the first line of the file as a string:

``` f = open("test.txt", "r")# Return the first linef.readline() 'sample line 1\n' ```

Notice how the newline character `\n` is included at the end of the string.

If we call `file.readline(~)` consecutively, we will return consecutive lines from the files:

``` f = open("test.txt", "r")# Print first line from the fileprint(f.readline())# Print second line from the file print(f.readline()) sample line 1sample line 2 ```
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