python读文件逐行处理的示例代码分享
Jun 06, 2016 am 11:28 AM代码如下:
import os ## for os.path.isfile()
def dealline(line) :
print(line) ## 针对line我可以做很多事情
def getfilename() :
return input('Please input file name(input exit() for exit):').strip()
class more : ## MORE功能
linenum = 0
size = 10
def work(self) :
if self.linenum >= self.size :
if input('--MORE--').strip().lower() == 'exit()' :
return False
self.linenum = 0
else :
self.linenum += 1
return True
while True :
try :
filename = getfilename()
if filename.lower() == 'exit()' : ## 退出
break
if os.path.isfile(filename) : ## 判断文件是否存在
f = open(filename)
try :
lines = f.readlines()
m = more()
for line in lines:
if False == m.work() :
break
dealline(line)
## input()
finally :
f.close()
else :
print('File does not exists.')
##input()
except :
print('Input Error!')
还可以用
代码如下:
with open(filename) as fh:
for line in fh:
yield line
输出每一行

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