Python按行读取文件的实现方法【小文件和大文件读取】

本文实例讲述了Python按行读取文件的实现方法。分享给大家供大家参考，具体如下：

小文件：

#coding=utf-8
#author: walker
#date: 2013-12-30
#function: 按行读取小文件
all_lines = []
try:
  file = open('txt.txt', 'r')
  all_lines = file.readlines()
except IOError as err:
  print('File error: ' + str(err))
finally:
  if 'file' in locals():
    file.close()
for line in all_lines:
  print(line)

大文件：

#coding=utf-8
#author: walker
#date: 2013-12-30
#function: 按行读取大文件
try:
  file = open('txt.txt', 'r')
  for line in file:
    print(line)
except IOError as err:
  print('File error: ' + str(err))
finally:
  if 'file' in locals():
    file.close()

希望本文所述对大家Python程序设计有所帮助。