如何以最有效的内存和时间方式获取大文件的行数?
def file_len(filename):
with open(filename) as f:
for i, _ in enumerate(f):
pass
return i + 1
如何以最有效的内存和时间方式获取大文件的行数?
def file_len(filename):
with open(filename) as f:
for i, _ in enumerate(f):
pass
return i + 1
当前回答
另一种可能性:
import subprocess
def num_lines_in_file(fpath):
return int(subprocess.check_output('wc -l %s' % fpath, shell=True).strip().split()[0])
其他回答
计数= max(开放(文件))[0]
def line_count(path):
count = 0
with open(path) as lines:
for count, l in enumerate(lines, start=1):
pass
return count
如果你想在Linux下的Python中廉价地获取行数,我推荐这个方法:
import os
print os.popen("wc -l file_path").readline().split()[0]
File_path可以是抽象文件路径,也可以是相对路径。希望这能有所帮助。
def file_len(full_path):
""" Count number of lines in a file."""
f = open(full_path)
nr_of_lines = sum(1 for line in f)
f.close()
return nr_of_lines
这个呢?
import sys
sys.stdin=open('fname','r')
data=sys.stdin.readlines()
print "counted",len(data),"lines"