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Can iterators be reset in Python?
...y available.
As several answers rightly remarked, in the specific case of csv you can also .seek(0) the underlying file object (a rather special case). I'm not sure that's documented and guaranteed, though it does currently work; it would probably be worth considering only for truly huge csv file...
Create Pandas DataFrame from a string
...ringIO (python2) or io.StringIO (python3) and pass that to the pandas.read_csv function. E.g:
import sys
if sys.version_info[0] < 3:
from StringIO import StringIO
else:
from io import StringIO
import pandas as pd
TESTDATA = StringIO("""col1;col2;col3
1;4.4;99
2;4.5;200
3;4...
Load data from txt with pandas
...
You can use:
data = pd.read_csv('output_list.txt', sep=" ", header=None)
data.columns = ["a", "b", "c", "etc."]
Add sep=" " in your code, leaving a blank space between the quotes. So pandas can detect spaces between values and sort in columns. Data co...
ZMQ: 基本原理 - 开源 & Github - 清泛网 - 专注C/C++及内核技术
...输地址协同工作，比如IP地址，而后者仅仅使用处理器（文件描述符）去定位具体的拓扑：
/* Topology establishment */
int s = zmq_socket (...);
zmq_connect (s, "tcp://192.168.0.111:5555");
/* Message routing */
const char data [] = "ABC";
zmq_send (s, data, ...
ZMQ: 基本原理 - 开源 & Github - 清泛网 - 专注C/C++及内核技术
...输地址协同工作，比如IP地址，而后者仅仅使用处理器（文件描述符）去定位具体的拓扑：
/* Topology establishment */
int s = zmq_socket (...);
zmq_connect (s, "tcp://192.168.0.111:5555");
/* Message routing */
const char data [] = "ABC";
zmq_send (s, data, ...
Open the file in universal-newline mode using the CSV Django module
I am trying to access a model.filefield in Django to parse a CSV file in Python using the csv module. It's working on Windows, but on Mac it gave me this:
...
Trimming a huge (3.5 GB) csv file to read into R
...
My try with readLines. This piece of a code creates csv with selected years.
file_in <- file("in.csv","r")
file_out <- file("out.csv","a")
x <- readLines(file_in, n=1)
writeLines(x, file_out) # copy headers
B <- 300000 # depends how large is one pack
while(length...
ZMQ: 基本原理 - 开源 & Github - 清泛网移动版 - 专注C/C++及内核技术
...输地址协同工作，比如IP地址，而后者仅仅使用处理器（文件描述符）去定位具体的拓扑：
/* Topology establishment */
int s = zmq_socket (...);
zmq_connect (s, "tcp://192.168.0.111:5555");
/* Message routing */
const char data [] = "ABC";
zmq_send (s, data, ...
MQTT与TCP的区别 - 创客硬件开发 - 清泛IT社区，为创新赋能！
...条消息就发送上千条采集的数据，或者比较大的设备阴影文件。技术挑战TCP需要解决的问题是在IP包传输过程中，处理异构网络环境下的网络拥塞、丢包、乱序、重复包等多种问题。MQTT解决的问题是，在低带宽高延迟不可靠的网...
plsql 存储过程 事务 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...滚时，oracle会确认事务变化或回滚事务、结束事务、删除保存点、释放锁。
4、提交事务（COMMIT）确认事务变化，结束当前事务、删除保存点，释放锁，使得当前事务中所有未决的数据永久改变。
5、保存点（SAVEPOINT）在当前事...