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：

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Created on Dec 17, 2012 
读取文件 
@author: liury_lab 
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# 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 python
hello world
b\'ABCDEFG\\r\\nHELLO\\r\\nhello\'
hello python
hello world
[\'hello python\\n\', \'hello world\']
[\'hello python\', \'hello world\']
hello python
hello 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。