Скачать или смотреть Efficiently Join Lines of Text Shorter than 50 Characters in Python

Learn how to loop through lines of text in Python and join those that are shorter than 50 characters into one cohesive line!
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How to Efficiently Join Lines of Text Shorter than 50 Characters in Python

If you're working with a document in Python and need to process each line of text, you might encounter situations where some lines are shorter than a specific length. In this case, the goal is to join these shorter lines until a longer line (greater than 50 characters) is met. Let's dive into how you can implement this in Python effectively.

The Problem at Hand

You might have a text file where each line can vary in length, and your aim is to concatenate lines that are shorter than or equal to 50 characters. Whenever you come across a line that exceeds this limit, you'll want to write out the concatenated result and then continue processing the subsequent lines. It can be tricky, especially when dealing with the hierarchy of loops and maintaining the correct lines for concatenation.

Overview of the Solution

To solve this problem, we'll perform the following steps:

Open the input and output files.

Read all the lines from the input file.

Loop through each line and check its length.

Concatenate shorter lines, and write to the output file when a longer line is encountered.

Let's break it down further.

Step-by-step Explanation of the Code

Opening Files

To begin, we need to open both the input and output files using the with statement, which ensures proper handling of file resources.

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sys.argv[1]: Input file (source text file).

sys.argv[2]: Output file (where processed text will be saved).

Reading Lines

Next, we read all lines from the input file into a list:

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This stores each line as an element in the lines list.

Initializing Variables

Before we begin looping, we set up a variable prev_line to hold any concatenated lines.

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The Loop

Now, we'll loop through each line while checking its length:

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index: The current line number in the list.

line: The content of the current line.

Concatenation Logic

Within the loop, two conditions apply based on the length of the line:

A. Handling Longer Lines

If the line is longer than 50 characters, we need to write the concatenated result and reset prev_line.

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This writes the combination of the previous shorter lines and the current longer line to the output file.

B. Concatenating Shorter Lines

If the line is shorter than or equal to 50 characters, we just add it to prev_line for future concatenation.

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Final Code

Here’s the complete solution in one block:

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Conclusion

Looping through lines and conditionally joining them can be straightforward with a bit of planning. By following the steps laid out, you can effectively manage text formatting for better readability in your applications. Whether you're parsing logs, processing documents, or handling strings in general, this method helps in maintaining clean and concise outputs.

Feel free to try this out in your own Python projects, and happy coding!