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：
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#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)
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大文件：
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#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()
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希望本文所述对大家Python程序设计有所帮助。