Final answer:
To extract numbers from a file in Python, you can use the 're' module to search for numeric patterns in the file content. The 'extract_num()' function reads the file content and finds all instances of numbers using 're.findall()'. It then returns the 'x'-th number found, or 'Number not found' if there are fewer than 'x' numbers.
Step-by-step explanation:
Python function to extract a number from a file
To write a Python function extract_num() that extracts numbers from a file, you can use the re module to search for numeric patterns in the file content. Here is an example implementation:import redef extract_num(file_name, x):numbers = [] with open(file_name, 'r') as file: content = file.read() numbers = re.findall(r'\b\d+\b', content) if x <= len(numbers): return numbers[x - 1] else: return 'Number not found'This function reads the content of the file using file.read() and then uses the re.findall() function to find all instances of numbers in the content. It returns the x-th number found, or 'Number not found' if there are fewer than x numbers in the file.The function extract_num() in Python should be written to take a file name and an integer x as parameters.
The function will open the file given by the file name, read its contents, and extract all the numbers from the text, stopping after the x-th number has been found.Python Function ImplementationThe following is a possible implementation of the extract_num() function:import redef extract_num(file_name, x): with open(file_name, 'r') as file:content = file.read() numbers = re.findall(r'\d+', content)[:x] return [int(num) for num in numbers]The function uses the re module to find all substrings that are numbers. It reads the entire file content using the read() method, finds all series of digits with findall(), slices the result to get the first x numbers, and then converts them to integers before returning