如何用Python在文本文件中筛选Male且来自Canada的人员全量信息

First, let's assume your input text file (let's call it people.txt) has each person's details on a single line, with fields separated by a consistent delimiter—like a comma. For example:

Alex,Baldwin,Engineer,1985-03-12,Male,Canada
Jane,Smith,Teacher,1990-07-22,Female,Canada
Gary,Allen,Designer,1978-11-05,Male,Canada
Mike,Johnson,Doctor,1982-04-18,Male,USA

Here's a straightforward Python program that meets all your requirements—no regex, no external input, just plain line-by-line processing:

# Define the file path (adjust this to your actual file location)
FILE_PATH = "people.txt"

# Fixed filter criteria as requested
TARGET_GENDER = "Male"
TARGET_NATIONALITY = "Canada"

# Expected field order: First Name, Last Name, Occupation, Date of Birth, Gender, Nationality
EXPECTED_FIELDS = 6

try:
    with open(FILE_PATH, 'r') as file:
        for line_num, line in enumerate(file, start=1):
            # Clean up the line and skip empty ones
            cleaned_line = line.strip()
            if not cleaned_line:
                continue
            
            # Split the line into individual fields
            person_details = cleaned_line.split(',')
            
            # Skip lines that don't have the right number of fields to avoid errors
            if len(person_details) != EXPECTED_FIELDS:
                print(f"Skipping invalid line {line_num}: {cleaned_line}")
                continue
            
            # Unpack the fields into readable variables
            first_name, last_name, occupation, dob, gender, nationality = person_details
            
            # Check if the entry matches our fixed criteria
            if gender == TARGET_GENDER and nationality == TARGET_NATIONALITY:
                # Print the full details in a user-friendly format
                print(f"Matched Entry:\nName: {first_name} {last_name}\nOccupation: {occupation}\nDate of Birth: {dob}\nGender: {gender}\nNationality: {nationality}\n---")
except FileNotFoundError:
    print(f"Error: Could not find the file {FILE_PATH}. Double-check the path!")
except Exception as e:
    print(f"An unexpected issue occurred: {str(e)}")

Key Notes About This Implementation: #

• No External Input: All filter rules and the file path are hardcoded exactly as you asked.
• Safe File Handling: Uses a with statement to automatically close the file after processing, which is the standard Python best practice.
• Error Prevention: Skips empty lines and entries with missing/extra fields to avoid index errors or broken output.
• Readable Output: Formats matching entries clearly instead of just printing raw line text.

If your text file uses a different delimiter (like tabs or semicolons), just replace split(',') with split('\t') or split(';') to match your file's format.

内容的提问来源于stack exchange，提问作者Sarah Miller