Python 统计text 的行数

在Python中，统计文本文件的行数有多种方法。以下是几种常用的方法：

1. 使用内置函数 `open()` 和 `readlines()`:

def count_lines(file_path):
    with open(file_path, 'r', encoding='utf-8') as file:
        lines = file.readlines()
        return len(lines)

# 使用示例
file_path = 'example.txt'
line_count = count_lines(file_path)
print(f'The file has {line_count} lines.')

2. 使用 `for` 循环逐行读取:

def count_lines(file_path):
    line_count = 0
    with open(file_path, 'r', encoding='utf-8') as file:
        for line in file:
            line_count += 1
    return line_count

# 使用示例
file_path = 'example.txt'
line_count = count_lines(file_path)
print(f'The file has {line_count} lines.')

3. 使用生成器表达式:

def count_lines(file_path):
    with open(file_path, 'r', encoding='utf-8') as file:
        return sum(1 for line in file)

# 使用示例
file_path = 'example.txt'
line_count = count_lines(file_path)
print(f'The file has {line_count} lines.')

这些方法都能有效地统计文本文件的行数。选择哪种方法取决于你的具体需求和个人偏好。