如何用Python实现根据文本文件中相似数字匹配输出对应字母？

Here's the completed code that implements your desired logic, along with a breakdown of how it works:

import re

# Define the target numbers we're searching for (as strings to match split line elements)
TARGET_1 = '12389390'
TARGET_2 = '34789021'

# Initialize lists to hold letters for each target group
group_target1 = []
group_target2 = []

# Process the input text file
with open('letter.txt', 'r') as file:
    for line in file:
        stripped_line = line.strip()
        # Skip empty lines to avoid errors
        if not stripped_line:
            continue
        
        # Only process lines starting with a letter (matches your original check)
        if re.match('^[a-zA-Z]+', stripped_line):
            parts = stripped_line.split()
            letter = parts[0]
            
            # Add letter to group 1 if target 1 is present in the line
            if TARGET_1 in parts:
                group_target1.append(letter)
            
            # Add letter to group 2 if target 2 is present in the line
            if TARGET_2 in parts:
                group_target2.append(letter)

# Combine the groups: first all letters with target 1, then all with target 2
result = group_target1 + group_target2
output_str = ' '.join(result)

# Print the final output (matches your expected result)
print(output_str)  # Outputs: A C E B D E

# Write the result to the CSV file
with open('letter.csv', 'a+') as output:
    # Add a newline to keep entries separate on subsequent runs
    output.write(output_str + '\n')

Key Details & Explanation: #

• Target Matching: We use string checks because splitting each line turns all elements into strings, making direct comparisons straightforward.
• Group Separation: By using two lists, we maintain the order of lines from the input file while separating letters based on which target they contain.
• Dual Target Handling: Lines that contain both targets (like line E) are added to both groups, so they appear twice in the final result.
• Clean File Handling: We strip whitespace and skip empty lines to avoid processing invalid entries, and append a newline to the CSV file to keep entries formatted properly.

Note: Based on your input text, the code produces A C E B D E (with E appearing twice, once for each target). If your expected output of A C E B D E E was a typo, this code aligns perfectly with your described logic. If you intended an extra E, you'd need to adjust the logic to account for multiple occurrences of a target in a single line (though your input doesn't show this).

内容的提问来源于stack exchange，提问作者jan