Python按行读取文件的实现方法【小文件和大文件读取】

#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)

#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()