There should be one-- and preferably only one --obvious way to do it.(from The Zen of Pyhton)
python中读文件的方式有很多种， 这里整理一下。
# 直接读整个文件
# 如果文件比较大，会占用大量的内存
with open('somefile.txt') as f:
print f.read()
this is a test file
this is a test file
this is a test file
# 读整个文件， 返回一个list
# 读大文件也会比较占内存
# 其实readlines也可以指定size字节数， 不常用
with open('somefile.txt') as f:
for line in f.readlines():
print line.strip()
this is a test file
this is a test file
this is a test file
# 一次读1024字节
with open('somefile.txt') as f:
while True:
txt = f.read(1024)
if txt == '':
break
print txt
this is a test file
this is a test file
this is a test file
# 一次读一行
# readline也可以指定size字节数， 不常用
with open('somefile.txt') as f:
while True:
line = f.readline()
if line == '':
break
print line.strip()
this is a test file
this is a test file
this is a test file
# 一次读一行， 读大文件时推荐
with open('somefile.txt') as f:
for line in f:
print line.strip()
this is a test file
this is a test file
this is a test file
