In this tutorial, we are going to show you how to extract numbers from a text file using Python. We’ll be using the regular expression module, re, to perform this task.
Step 1: Create the txt file
Create the “codeigo.txt” with the following text:
Hi, it's your 24th bithday 10 little pigs My zip code is 28376
Step 2: Import the necessary modules
The first step in extracting numbers from a text file using Python is to import the necessary modules. In our case, we’ll need to import re, which is the regular expression module. Here’s how to import the module:
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import re |
Step 3: Open and read the text file
After importing the necessary module, we’ll need to open the text file and read its contents. Here’s how to achieve that:
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with open("codeigo.txt", "r") as file: text = file.read() |
Here, we open the “codeigo.txt” file in read mode and assign its contents to the “text” variable.
Step 4: Extract numbers using regular expressions
The next step is to extract the numbers from the text variable using regular expressions. We can use the re.findall() function to achieve this. Here’s how to do that:
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numbers = re.findall('\d+', text) |
In this step, we use the findall() function to search for all the occurrences of the regular expression “\d+” in the “text” variable. The “\d+” regular expression matches one or more digits.
The findall() function returns all the matches as a list of strings, which we assign to the “numbers” variable.
Step 5: Print the extracted numbers
Finally, we’ll print the extracted numbers to the screen using a loop. Here’s how to do that:
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for num in numbers: print(num) |
In this step, we loop through the “numbers” list and print each element to the screen.
Complete code
Here’s the complete code to extract all the numbers from a text file using Python:
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import re with open("codeigo.txt", "r") as file: text = file.read() numbers = re.findall('\d+', text) for num in numbers: print(num) |
Final result:
24 10 28376
Conclusion
Extracting numbers from a text file using Python is a straightforward task that can be achieved using the regular expression module. With the steps outlined above, you can extract all the numbers from a text file with just a few lines of code.