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from sys import exit
import lxml.html
import requests

url = 'http://www.myfxbook.com/community/outlook'
doc = requests.get(url)
root = lxml.html.fromstring(doc.text)

all_id_inputs = root.xpath("//input[starts-with(@id,'outlookTip')]/@id")

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from sys import exit
from pprint import pprint

import lxml.html
import requests
import re

url = 'http://i.cantonfair.org.cn/en/ExpExhibitorList.aspx?k=glassware&page=1'
doc = requests.get(url)
root = lxml.html.fromstring(doc.text)

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# Let us consider the following typical mysql backup script:
mysqldump --routines --no-data -h $mysqlHost -P $mysqlPort -u $mysqlUser -p$mysqlPassword $database

# It succeeds but stderr will get:
# Warning: Using a password on the command line interface can be insecure.
# You can fix this with the below hack:
credentialsFile=/mysql-credentials.cnf
echo "[client]" > $credentialsFile
echo "user=$mysqlUser" >> $credentialsFile
echo "password=$mysqlPassword" >> $credentialsFile

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参考 很奇怪的事情

cd /m 

之后打了一个tab给我提示：

bash: cannot create temp file for here-document: No space left on device

查了一圈之后找到答案：(具体原因不明，需要以后查看）

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#!/bin/bash

DBUSER="root";
DBPASS="";
DBHOST="localhost";

DB_OLD=mydatabase
DB_NEW=clone_mydatabase

DBCONN="--host=${DBHOST} --user=${DBUSER} --password=${DBPASS}";

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#XLarge DBInstanceClassMemory = 15892177440 = 14.8GB
#/32 = 496630545 = 473MB
#/64 = 248315272 = 236MB
#/128 = 124157636 = 118MB
#/256 = 62078818 = 59MB
#/512 = 31039409 = 29MB
#/12582880 = 1263 #default same divisor as max_connections = 4041.6MB = 4237924762
#/25165760 = 623 # half of max_connections = 1993.6MB
#/50331520 = 315 # quarter of max_connections = 1008MB = 1056964608
#*(3/4) #default innodb pool size = 11922309120

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rds-modify-db-parameter-group {param-group-name} \
--parameters="name=character_set_server, value=utf8, method=pending-reboot" \
--parameters="name=collation_server, value=utf8_general_ci, method=pending-reboot" \
--parameters="name=tmp_table_size, value={DBInstanceClassMemory/16}, method=pending-reboot" \
--parameters="name=max_heap_table_size, value={DBInstanceClassMemory/16}, method=pending-reboot" \
--parameters="name=query_cache_type, value=1, method=pending-reboot" \
--parameters="name=query_cache_size, value=131072, method=pending-reboot" \
--parameters="name=table_open_cache, value=2500, method=pending-reboot" \
--parameters="name=join_buffer_size, value={DBInstanceClassMemory/64}, method=pending-reboot" \
--parameters="name=thread_cache_size, value={DBInstanceClassMemory/12582880}, method=pending-reboot" \

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Install MongoDB with Homebrew

brew install mongodb
mkdir -p /data/db

Set permissions for the data directory

Ensure that user account running mongod has correct permissions for the directory:

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from nltk import word_tokenize
from nltk.corpus import reuters 
from sklearn.feature_extraction.text import TfidfVectorizer
from nltk.stem.porter import PorterStemmer
import re
from nltk.corpus import stopwords

cachedStopWords = stopwords.words("english")

def tokenize(text):

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#############################################
# Push de la rama actual
git push origin $rama_actual

#############################################
# Volver a un commit anterior, descartando los cambios
git reset --HARD $SHA1

#############################################
# Ver y descargar Ramas remotas