python按行读取文件取消空白行_在Python中读取文件时忽略空行的最简单方法

我会堆叠生成器表达式：

with open(filename) as f_in:

lines = (line.rstrip() for line in f_in) # All lines including the blank ones

lines = (line for line in lines if line) # Non-blank lines

现在,行是所有非空白行.这样可以避免两次调用线路上的条带.如果你想要一个行列表,那么你可以这样做：

with open(filename) as f_in:

lines = (line.rstrip() for line in f_in)

lines = list(line for line in lines if line) # Non-blank lines in a list

你也可以用单行代码(exlude with statement)来实现它,但它不再有效且难以阅读：

with open(filename) as f_in:

lines = list(line for line in (l.strip() for l in f_in) if line)

更新：

我同意这是因为重复令牌而丑陋.如果您愿意,您可以编写一个生成器：

def nonblank_lines(f):

for l in f:

line = l.rstrip()

if line:

yield line

然后称之为：

with open(filename) as f_in:

for line in nonblank_lines(f_in):

# Stuff

更新2：

with open(filename) as f_in:

lines = filter(None, (line.rstrip() for line in f_in))

并在CPython上(具有确定性引用计数)

lines = filter(None, (line.rstrip() for line in open(filename)))

在Python 2中使用itertools.ifilter如果你想要一个生成器,在Python 3中,如果你想要一个列表,只需将整个事物传递给列表.