Python3读取文件常用方法实例分析

本文实例讲述了Python3读取文件常用方法。分享给大家供大家参考。具体如下：

''''' Created on Dec 17, 2012 读取文件 @author: liury_lab ''' # 最方便的方法是一次性读取文件中的所有内容放到一个大字符串中： all_the_text = open('d:/text.txt').read() print(all_the_text) all_the_data = open('d:/data.txt', 'rb').read() print(all_the_data) # 更规范的方法 file_object = open('d:/text.txt') try:   all_the_text = file_object.read()   print(all_the_text) finally:   file_object.close() # 下面的方法每行后面有‘/n'  file_object = open('d:/text.txt') try:   all_the_text = file_object.readlines()   print(all_the_text) finally:   file_object.close() # 三句都可将末尾的'/n'去掉  file_object = open('d:/text.txt') try:   #all_the_text = file_object.read().splitlines()   #all_the_text = file_object.read().split('/n')   all_the_text = [L.rstrip('/n') for L in file_object]   print(all_the_text) finally:   file_object.close() # 逐行读 file_object = open('d:/text.txt') try:   for line in file_object:     print(line, end = '') finally:   file_object.close() # 每次读取文件的一部分 def read_file_by_chunks(file_name, chunk_size = 100):     file_object = open(file_name, 'rb')   while True:     chunk = file_object.read(chunk_size)     if not chunk:       break     yield chunk   file_object.close() for chunk in read_file_by_chunks('d:/data.txt', 4):   print(chunk)

输出如下：

hello pythonhello worldb'ABCDEFG/r/nHELLO/r/nhello'hello pythonhello world['hello python/n', 'hello world']['hello python', 'hello world']hello pythonhello worldb'ABCD'b'EFG/r'b'/nHEL'b'LO/r/n'b'hell'b'o'

希望本文所述对大家的Python程序设计有所帮助。