linecache读取大文件

# coding=utf-8
import os
import linecache
def get_content(path):
    '''读取缓存中文件内容，以字符串形式返回'''
    if os.path.exists(path):
        content = ''
        cache_data = linecache.getlines(path)
        for line in range(len(cache_data)):
            content += cache_data[line]
        return content
    else:
        print('the path [{}] is not exist!'.format(path))
def main():
    path = 'E:\\lyd\\test.txt'
    content = get_content(path)
    print(content)
if __name__ == '__main__':
    main()