How Can I Read a File in Python Without Newline Characters?

Reading a File Without Newlines

Python's open(filename,'r').readlines() method provides a list of lines from a file, but each element includes a newline character. To retrieve the data without these characters, several approaches are available.

Using str.splitlines()

One method is to read the entire file and split the lines using str.splitlines:

temp = file.read().splitlines()

Stripping Newlines Manually

Alternatively, you can strip the newline from each line manually:

temp = [line[:-1] for line in file]

Note: This approach assumes the file ends with a newline; otherwise, the last line will lose a character.

Handling End-of-File Newlines

To avoid this issue, you can append a newline to the end of the file if it's missing:

with open(the_file, 'r+') as f:
    f.seek(-1, 2)
    if f.read(1) != '\n':
        f.write('\n')
        f.flush()
        f.seek(0)
    lines = [line[:-1] for line in f]

Or, more concisely, strip the newline:

[line.rstrip('\n') for line in file]

Equivalent readlines Implementation

The readlines method effectively emulates the following code:

def readlines(self):
    lines = []
    for line in iter(self.readline, ''):
        lines.append(line)
    return lines

Therefore, readlines() also retains the newline characters read by readline().

The above is the detailed content of How Can I Read a File in Python Without Newline Characters?. For more information, please follow other related articles on the PHP Chinese website!