How to Eliminate Newline Characters from a List When Using .readlines()?

Eliminating Newline Characters with .readlines()

In working with .txt files, it is common to encounter challenges when using .readlines() to retrieve the file's contents into a list. The resulting list may contain unwanted newline characters (n) appended to each line, which can be inconvenient for certain processing scenarios.

Code Example:

Consider the following code snippet:

t = open('filename.txt')
contents = t.readlines()

Running this code would load the contents of filename.txt into the "contents" list, but each line would have an additional "n" character appended to it:

['Value1\n', 'Value2\n', 'Value3\n', 'Value4\n']

Solution:

To eliminate these newline characters, we can employ two techniques:

• f.read().splitlines(): This approach reads the entire file into a single string and then splits it into lines using the splitlines() method, which does not include n characters.
• strip(): This method can be applied to each line in the list to remove any trailing whitespace or newline characters.

Updated Code:

<code class="python">with open(filename) as f:
    mylist = f.read().splitlines() 

# or 
    
with open(filename) as f:
    mylist = [line.strip() for line in f]</code>

Using either of these solutions will produce a list of strings without any unwanted newline characters:

['Value1', 'Value2', 'Value3', 'Value4']

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