写文件
# -*- coding:utf-8 -*-
import random
import threading
import string
import time
t1 = time.time()
def write(x):
with open('a.txt','a+')as a:
a.write(x + '||')
def run():
for x in range(10000000):
strs = str(random.randint(1000,2000)) +random.choice(string.ascii_letters)*10
write(strs)
for x in range(10):
t = threading.Thread(target=run)
t.start()
t2 = time.time()
print(t2 - t1)
读文件
# -*- coding:utf-8 -*-
def readbooks(f, newline):
# f为传入的文件名，newline为分隔符
buf = ""
# 缓存，处理已经读出来的数据量
while 1:
while newline in buf:
# 缓存中的数据是否存在分隔符
pos = buf.index(newline)
# 如果存在就找到字符的位置,比如0或者1或者2
yield buf[:pos]
# 暂停函数，返回缓存中的从头到字符的位置
buf = buf[pos + len(newline):]
# 缓存变成了，字符的位置到末尾
chunk = f.read(2010 * 10)
# 读取2010*10的字符
if not chunk:
# 已经读取到了文件结尾
yield buf
break
buf += chunk
# 加到缓存
with open('a.txt','r')as f:
for line in readbooks(f,'||'):
print(line)
