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python串行执行和并行执行的方法

发布时间：2020-07-29 12:36:31 作者：小猪
来源：亿速云 阅读：337

这篇文章主要讲解了python串行执行和并行执行的方法，内容清晰明了，对此有兴趣的小伙伴可以学习一下，相信大家阅读完之后会有帮助。

我就废话不多说了，大家还是直接看代码吧！

#coding=utf-8
 
import threading
 
import time
 
import cx_Oracle
 
from pprint import pprint
 
import csv
 
print time.asctime()
 
table_name = "dbtest.csv"
 
f = open(table_name + ".csv", "w")
 
conn = cx_Oracle.connect('tlcbuser/tlcbuser@20.5.101.31/tlyy')
 
cursor = conn.cursor()
 
def query01():
 
  tname = threading.current_thread()
 
  aa=10
 
  # cursor.execute("SELECT * FROM TEST100 WHERE ID = %s", [aa])
 
  cursor.prepare("""SELECT * FROM TEST100 WHERE ID=:id""")
 
  cursor.execute(None,{'id':aa})
 
  row = cursor.fetchall()
 
  print row
 
  return row
 
  cursor.close()
 
def query02():
 
  tname = threading.current_thread()
 
  aa=20
 
  # cursor.execute("SELECT * FROM TEST100 WHERE ID = %s", [aa])
 
  cursor.prepare("""SELECT * FROM TEST100 WHERE ID=:id""")
 
  cursor.execute(None,{'id':aa})
 
  row = cursor.fetchall()
 
  print row
 
  return row
 
  cursor.close()
 
def query03():
 
  tname = threading.current_thread()
 
  aa=30
 
  # cursor.execute("SELECT * FROM TEST100 WHERE ID = %s", [aa])
 
  cursor.prepare("""SELECT * FROM TEST100 WHERE ID=:id""")
 
  cursor.execute(None,{'id':aa})
 
  row = cursor.fetchall()
 
  print row
 
  return row
 
  cursor.close()
 
def query04():
 
  tname = threading.current_thread()
 
  aa=40
 
  # cursor.execute("SELECT * FROM TEST100 WHERE ID = %s", [aa])
 
  cursor.prepare("""SELECT * FROM TEST100 WHERE ID=:id""")
 
  cursor.execute(None,{'id':aa})
 
  row = cursor.fetchall()
 
  print row
 
  return row
 
def query05():
 
  tname = threading.current_thread()
 
  aa=50
 
  # cursor.execute("SELECT * FROM TEST100 WHERE ID = %s", [aa])
 
  cursor.prepare("""SELECT * FROM TEST100 WHERE ID=:id""")
 
  cursor.execute(None,{'id':aa})
 
  row = cursor.fetchall()
 
  print row
 
  return row
 
  cursor.close()
 
def query06():
 
  tname = threading.current_thread()
 
  aa=60
 
  # cursor.execute("SELECT * FROM TEST100 WHERE ID = %s", [aa])
 
  cursor.prepare("""SELECT * FROM TEST100 WHERE ID=:id""")
 
  cursor.execute(None,{'id':aa})
 
  row = cursor.fetchall()
 
  print row
 
  return row
 
  cursor.close()
 
def query07():
 
  tname = threading.current_thread()
 
  aa=70
 
  # cursor.execute("SELECT * FROM TEST100 WHERE ID = %s", [aa])
 
  cursor.prepare("""SELECT * FROM TEST100 WHERE ID=:id""")
 
  cursor.execute(None,{'id':aa})
 
  row = cursor.fetchall()
 
  return row
 
  cursor.close()
 
def query08():
 
  tname = threading.current_thread()
 
  aa=80
 
  # cursor.execute("SELECT * FROM TEST100 WHERE ID = %s", [aa])
 
  cursor.prepare("""SELECT * FROM TEST100 WHERE ID=:id""")
 
  cursor.execute(None,{'id':aa})
 
  row = cursor.fetchall()
 
  print row
 
  return row
 
  cursor.close()
 
def query09():
 
  tname = threading.current_thread()
 
  aa=90
 
  # cursor.execute("SELECT * FROM TEST100 WHERE ID = %s", [aa])
 
  cursor.prepare("""SELECT * FROM TEST100 WHERE ID=:id""")
 
  cursor.execute(None,{'id':aa})
 
  row = cursor.fetchall()
 
  print row
 
  return row
 
  cursor.close()
 
def query10():
 
  tname = threading.current_thread()
 
  aa=100
 
  # cursor.execute("SELECT * FROM TEST100 WHERE ID = %s", [aa])
 
  cursor.prepare("""SELECT * FROM TEST100 WHERE ID=:id""")
 
  cursor.execute(None,{'id':aa})
 
  row = cursor.fetchall()
 
  print row
 
  return row
 
  cursor.close() 
 
 
threads = []
 
t1 = threading.Thread(target=query01, name='query01')
 
threads.append(t1)
 
t2 = threading.Thread(target=query02, name='query02')
 
threads.append(t2)
 
t2 = threading.Thread(target=query03, name='query03')
 
threads.append(t2)
 
t2 = threading.Thread(target=query04, name='query04')
 
threads.append(t2)
 
t2 = threading.Thread(target=query05, name='query05')
 
threads.append(t2)
 
t2 = threading.Thread(target=query06, name='query06')
 
threads.append(t2)
 
t2 = threading.Thread(target=query07, name='query07')
 
threads.append(t2)
 
t2 = threading.Thread(target=query08, name='query08')
 
threads.append(t2)
 
t2 = threading.Thread(target=query09, name='query09')
 
threads.append(t2)
 
t2 = threading.Thread(target=query10, name='query10')
 
threads.append(t2) 
 
if __name__ == '__main__':
 
  for t in threads:
 
    # t.setDaemon(True)
 
    t.start()
 
    # t.run()
 
    # t.start()
 
    # print '3333333'
 
    print threading.current_thread()
 
    # print t.is_alive()
 
    # print '3333333'
 
    t.join()
 
  print "all over "
 
  print time.asctime() 
 
 
C:\Python27\python.exe C:/Users/tlcb/PycharmProjects/untitled/a2.py
 
Wed Mar 28 11:08:19 2018
 
<_MainThread(MainThread, started 18744)>
 
[(10, '10boobook10', '10aaaaaaaaaaaa10', '10bbbbbbbbbbbbbbbbb10'), (10, '10sssssssss10', 'tlcb', 'tlcb'), (10, '10boobook10', '10aaaaaaaaaaaa10', '10bbbbbbbbbbbbbbbbb10')]
 
<_MainThread(MainThread, started 18744)>
 
[(20, '20boobook20', '20aaaaaaaaaaaa20', '20bbbbbbbbbbbbbbbbb20'), (20, '20boobook20', '20aaaaaaaaaaaa20', '20bbbbbbbbbbbbbbbbb20'), (20, '20boobook20', '20aaaaaaaaaaaa20', '20bbbbbbbbbbbbbbbbb20')]
 
<_MainThread(MainThread, started 18744)>
 
[(30, '30boobook30', '30aaaaaaaaaaaa30', '30bbbbbbbbbbbbbbbbb30'), (30, '30boobook30', '30aaaaaaaaaaaa30', '30bbbbbbbbbbbbbbbbb30'), (30, '30boobook30', '30aaaaaaaaaaaa30', '30bbbbbbbbbbbbbbbbb30')]
 
<_MainThread(MainThread, started 18744)>
 
[(40, '40boobook40', '40aaaaaaaaaaaa40', '40bbbbbbbbbbbbbbbbb40'), (40, '40boobook40', '40aaaaaaaaaaaa40', '40bbbbbbbbbbbbbbbbb40'), (40, '40boobook40', '40aaaaaaaaaaaa40', '40bbbbbbbbbbbbbbbbb40')]
 
<_MainThread(MainThread, started 18744)>
 
[(50, '50boobook50', '50aaaaaaaaaaaa50', '50bbbbbbbbbbbbbbbbb50'), (50, '50boobook50', '50aaaaaaaaaaaa50', '50bbbbbbbbbbbbbbbbb50'), (50, '50boobook50', '50aaaaaaaaaaaa50', '50bbbbbbbbbbbbbbbbb50')]
 
<_MainThread(MainThread, started 18744)>
 
[(60, '60boobook60', '60aaaaaaaaaaaa60', '60bbbbbbbbbbbbbbbbb60'), (60, '60boobook60', '60aaaaaaaaaaaa60', '60bbbbbbbbbbbbbbbbb60'), (60, '60boobook60', '60aaaaaaaaaaaa60', '60bbbbbbbbbbbbbbbbb60')]
 
<_MainThread(MainThread, started 18744)>
 
<_MainThread(MainThread, started 18744)>
 
[(80, '80boobook80', '80aaaaaaaaaaaa80', '80bbbbbbbbbbbbbbbbb80'), (80, '80boobook80', '80aaaaaaaaaaaa80', '80bbbbbbbbbbbbbbbbb80'), (80, '80boobook80', '80aaaaaaaaaaaa80', '80bbbbbbbbbbbbbbbbb80')]
 
<_MainThread(MainThread, started 18744)>
 
[(90, '90boobook90', '90aaaaaaaaaaaa90', '90bbbbbbbbbbbbbbbbb90'), (90, '90boobook90', '90aaaaaaaaaaaa90', '90bbbbbbbbbbbbbbbbb90'), (90, '90boobook90', '90aaaaaaaaaaaa90', '90bbbbbbbbbbbbbbbbb90')]
 
<_MainThread(MainThread, started 18744)>
 
[(100, '100boobook100', '100aaaaaaaaaaaa100', '100bbbbbbbbbbbbbbbbb100'), (100, '100boobook100', '100aaaaaaaaaaaa100', '100bbbbbbbbbbbbbbbbb100'), (100, '100boobook100', '100aaaaaaaaaaaa100', '100bbbbbbbbbbbbbbbbb100')]
 
all over 
 
Wed Mar 28 11:08:34 2018 
 
Process finished with exit code 0 
 
 
这个时候是串行 花费了15秒 
 
 
多线程跑:
 
#coding=utf-8
 
import threading
 
import time
 
import cx_Oracle
 
from pprint import pprint
 
import csv
 
print time.asctime()
 
table_name = "dbtest.csv"
 
f = open(table_name + ".csv", "w") 
 
 
def query01():
 
  tname = threading.current_thread()
 
  aa=10
 
  conn = cx_Oracle.connect('tlcbuser/tlcbuser@20.5.101.31/tlyy')
 
  cursor = conn.cursor()
 
  # cursor.execute("SELECT * FROM TEST100 WHERE ID = %s", [aa])
 
  cursor.prepare("""SELECT * FROM TEST100 WHERE ID=:id""")
 
  cursor.execute(None,{'id':aa})
 
  row = cursor.fetchall()
 
  print row
 
  return row
 
  cursor.close()
 
  conn.close()
 
def query02():
 
  tname = threading.current_thread()
 
  aa=20
 
  conn = cx_Oracle.connect('tlcbuser/tlcbuser@20.5.101.31/tlyy')
 
  cursor = conn.cursor()
 
  # cursor.execute("SELECT * FROM TEST100 WHERE ID = %s", [aa])
 
  cursor.prepare("""SELECT * FROM TEST100 WHERE ID=:id""")
 
  cursor.execute(None,{'id':aa})
 
  row = cursor.fetchall()
 
  print row
 
  return row
 
  cursor.close()
 
  conn.close()
 
def query03():
 
  tname = threading.current_thread()
 
  aa=30
 
  conn = cx_Oracle.connect('tlcbuser/tlcbuser@20.5.101.31/tlyy')
 
  cursor = conn.cursor()
 
  # cursor.execute("SELECT * FROM TEST100 WHERE ID = %s", [aa])
 
  cursor.prepare("""SELECT * FROM TEST100 WHERE ID=:id""")
 
  cursor.execute(None,{'id':aa})
 
  row = cursor.fetchall()
 
  print row
 
  return row
 
  cursor.close()
 
  conn.close()
 
def query04():
 
  conn = cx_Oracle.connect('tlcbuser/tlcbuser@20.5.101.31/tlyy')
 
  cursor = conn.cursor()
 
  tname = threading.current_thread()
 
  aa=40
 
  # cursor.execute("SELECT * FROM TEST100 WHERE ID = %s", [aa])
 
  cursor.prepare("""SELECT * FROM TEST100 WHERE ID=:id""")
 
  cursor.execute(None,{'id':aa})
 
  row = cursor.fetchall()
 
  print row
 
  return row
 
  cursor.close()
 
  conn.close()
 
def query05():
 
  conn = cx_Oracle.connect('tlcbuser/tlcbuser@20.5.101.31/tlyy')
 
  cursor = conn.cursor()
 
  tname = threading.current_thread()
 
  aa=50
 
  # cursor.execute("SELECT * FROM TEST100 WHERE ID = %s", [aa])
 
  cursor.prepare("""SELECT * FROM TEST100 WHERE ID=:id""")
 
  cursor.execute(None,{'id':aa})
 
  row = cursor.fetchall()
 
  print row
 
  return row
 
  cursor.close()
 
  conn.close()
 
def query06():
 
  conn = cx_Oracle.connect('tlcbuser/tlcbuser@20.5.101.31/tlyy')
 
  cursor = conn.cursor()
 
  tname = threading.current_thread()
 
  aa=60
 
  # cursor.execute("SELECT * FROM TEST100 WHERE ID = %s", [aa])
 
  cursor.prepare("""SELECT * FROM TEST100 WHERE ID=:id""")
 
  cursor.execute(None,{'id':aa})
 
  row = cursor.fetchall()
 
  print row
 
  return row
 
  cursor.close()
 
  conn.close()
 
def query07():
 
  conn = cx_Oracle.connect('tlcbuser/tlcbuser@20.5.101.31/tlyy')
 
  cursor = conn.cursor()
 
  tname = threading.current_thread()
 
  aa=70
 
  # cursor.execute("SELECT * FROM TEST100 WHERE ID = %s", [aa])
 
  cursor.prepare("""SELECT * FROM TEST100 WHERE ID=:id""")
 
  cursor.execute(None,{'id':aa})
 
  row = cursor.fetchall()
 
  return row
 
  cursor.close()
 
  conn.close()
 
def query08():
 
  conn = cx_Oracle.connect('tlcbuser/tlcbuser@20.5.101.31/tlyy')
 
  cursor = conn.cursor()
 
  tname = threading.current_thread()
 
  aa=80
 
  # cursor.execute("SELECT * FROM TEST100 WHERE ID = %s", [aa])
 
  cursor.prepare("""SELECT * FROM TEST100 WHERE ID=:id""")
 
  cursor.execute(None,{'id':aa})
 
  row = cursor.fetchall()
 
  print row
 
  return row
 
  cursor.close()
 
  conn.close()
 
def query09():
 
  conn = cx_Oracle.connect('tlcbuser/tlcbuser@20.5.101.31/tlyy')
 
  cursor = conn.cursor()
 
  tname = threading.current_thread()
 
  aa=90
 
  # cursor.execute("SELECT * FROM TEST100 WHERE ID = %s", [aa])
 
  cursor.prepare("""SELECT * FROM TEST100 WHERE ID=:id""")
 
  cursor.execute(None,{'id':aa})
 
  row = cursor.fetchall()
 
  print row
 
  return row
 
  cursor.close()
 
  conn.close()
 
def query10():
 
  conn = cx_Oracle.connect('tlcbuser/tlcbuser@20.5.101.31/tlyy')
 
  cursor = conn.cursor()
 
  tname = threading.current_thread()
 
  aa=100
 
  # cursor.execute("SELECT * FROM TEST100 WHERE ID = %s", [aa])
 
  cursor.prepare("""SELECT * FROM TEST100 WHERE ID=:id""")
 
  cursor.execute(None,{'id':aa})
 
  row = cursor.fetchall()
 
  print row
 
  return row
 
  cursor.close()
 
  conn.close() 
 
 
threads = []
 
t1 = threading.Thread(target=query01, name='query01')
 
threads.append(t1)
 
t2 = threading.Thread(target=query02, name='query02')
 
threads.append(t2)
 
t2 = threading.Thread(target=query03, name='query03')
 
threads.append(t2)
 
t2 = threading.Thread(target=query04, name='query04')
 
threads.append(t2)
 
t2 = threading.Thread(target=query05, name='query05')
 
threads.append(t2)
 
t2 = threading.Thread(target=query06, name='query06')
 
threads.append(t2)
 
t2 = threading.Thread(target=query07, name='query07')
 
threads.append(t2)
 
t2 = threading.Thread(target=query08, name='query08')
 
threads.append(t2)
 
t2 = threading.Thread(target=query09, name='query09')
 
threads.append(t2)
 
t2 = threading.Thread(target=query10, name='query10')
 
threads.append(t2) 
 
 
if __name__ == '__main__':
 
  for t in threads:
 
    # t.setDaemon(True)
 
    t.start()
 
    # t.run()
 
    # t.start()
 
    # print '3333333'
 
    print threading.current_thread()
 
    # print t.is_alive()
 
    # print '3333333'
 
  t.join()
 
  print "all over "
 
  print time.asctime() 
 
 
C:\Python27\python.exe C:/Users/tlcb/PycharmProjects/untitled/a2.py
 
Wed Mar 28 11:12:47 2018
 
<_MainThread(MainThread, started 22500)>
 
<_MainThread(MainThread, started 22500)>
 
<_MainThread(MainThread, started 22500)>
 
<_MainThread(MainThread, started 22500)>
 
<_MainThread(MainThread, started 22500)>
 
<_MainThread(MainThread, started 22500)>
 
<_MainThread(MainThread, started 22500)>
 
<_MainThread(MainThread, started 22500)>
 
<_MainThread(MainThread, started 22500)>
 
<_MainThread(MainThread, started 22500)>
 
[(40, '40boobook40', '40aaaaaaaaaaaa40', '40bbbbbbbbbbbbbbbbb40'), (40, '40boobook40', '40aaaaaaaaaaaa40', '40bbbbbbbbbbbbbbbbb40'), (40, '40boobook40', '40aaaaaaaaaaaa40', '40bbbbbbbbbbbbbbbbb40')]
 
[(60, '60boobook60', '60aaaaaaaaaaaa60', '60bbbbbbbbbbbbbbbbb60'), (60, '60boobook60', '60aaaaaaaaaaaa60', '60bbbbbbbbbbbbbbbbb60'), (60, '60boobook60', '60aaaaaaaaaaaa60', '60bbbbbbbbbbbbbbbbb60')]
 
[(80, '80boobook80', '80aaaaaaaaaaaa80', '80bbbbbbbbbbbbbbbbb80'), (80, '80boobook80', '80aaaaaaaaaaaa80', '80bbbbbbbbbbbbbbbbb80'), (80, '80boobook80', '80aaaaaaaaaaaa80', '80bbbbbbbbbbbbbbbbb80')]
 
[(50, '50boobook50', '50aaaaaaaaaaaa50', '50bbbbbbbbbbbbbbbbb50'), (50, '50boobook50', '50aaaaaaaaaaaa50', '50bbbbbbbbbbbbbbbbb50'), (50, '50boobook50', '50aaaaaaaaaaaa50', '50bbbbbbbbbbbbbbbbb50')]
 
[(10, '10boobook10', '10aaaaaaaaaaaa10', '10bbbbbbbbbbbbbbbbb10'), (10, '10sssssssss10', 'tlcb', 'tlcb'), (10, '10boobook10', '10aaaaaaaaaaaa10', '10bbbbbbbbbbbbbbbbb10')]
 
[(20, '20boobook20', '20aaaaaaaaaaaa20', '20bbbbbbbbbbbbbbbbb20'), (20, '20boobook20', '20aaaaaaaaaaaa20', '20bbbbbbbbbbbbbbbbb20'), (20, '20boobook20', '20aaaaaaaaaaaa20', '20bbbbbbbbbbbbbbbbb20')]
 
[(30, '30boobook30', '30aaaaaaaaaaaa30', '30bbbbbbbbbbbbbbbbb30'), (30, '30boobook30', '30aaaaaaaaaaaa30', '30bbbbbbbbbbbbbbbbb30'), (30, '30boobook30', '30aaaaaaaaaaaa30', '30bbbbbbbbbbbbbbbbb30')]
 
[(100, '100boobook100', '100aaaaaaaaaaaa100', '100bbbbbbbbbbbbbbbbb100'), (100, '100boobook100', '100aaaaaaaaaaaa100', '100bbbbbbbbbbbbbbbbb100'), (100, '100boobook100', '100aaaaaaaaaaaa100', '100bbbbbbbbbbbbbbbbb100')]
 
[(90, '90boobook90', '90aaaaaaaaaaaa90', '90bbbbbbbbbbbbbbbbb90'), (90, '90boobook90', '90aaaaaaaaaaaa90', '90bbbbbbbbbbbbbbbbb90'), (90, '90boobook90', '90aaaaaaaaaaaa90', '90bbbbbbbbbbbbbbbbb90')]
 
all over 
 
Wed Mar 28 11:12:55 2018 
 
Process finished with exit code 0 
 
此时花了 8秒

补充知识：python logging定制logstash的json日志格式

最近一直在折腾日志的收集，现在算是收尾了。 写一篇算python优化logstash的方案。

其实大家都知道logstash调用grok来解析日志的话，是要消耗cpu的成本的，毕竟是需要正则的匹配的。

根据logstash调优的方案，咱们可以预先生成json的格式。 我这边基本是python的程序，怎么搞尼 ？

有两种方法，第一种方法是生成json后，直接打入logstash的端口。 还有一种是生成json写入文件，让logstash做tail操作的时候，把一行的日志数据直接载入json就可以了。

python下的日志调试用得时logging，改成json也是很好改得。 另外不少老外已经考虑到这样的需求，已经做了python logstash的模块。

import logging
import logstash
import sys

host = 'localhost'

test_logger = logging.getLogger('python-logstash-logger')
test_logger.setLevel(logging.INFO)
test_logger.addHandler(logstash.LogstashHandler(host, 5959, version=1))
# test_logger.addHandler(logstash.TCPLogstashHandler(host, 5959, version=1))

test_logger.error('python-logstash: test logstash error message.')
test_logger.info('python-logstash: test logstash info message.')
test_logger.warning('python-logstash: test logstash warning message.')

# add extra field to logstash message
extra = {
  'test_string': 'python version: ' + repr(sys.version_info),
  'test_boolean': True,
  'test_dict': {'a': 1, 'b': 'c'},
  'test_float': 1.23,
  'test_integer': 123,
  'test_list': [1, 2, '3'],
}
test_logger.info('python-logstash: test extra fields', extra=extra)

python-logstash自带了amqp的方案

import logging
import logstash

# AMQP parameters
host = 'localhost'
username = 'guest'
password= 'guest'
exchange = 'logstash.py'

# get a logger and set logging level
test_logger = logging.getLogger('python-logstash-logger')
test_logger.setLevel(logging.INFO)

# add the handler
test_logger.addHandler(logstash.AMQPLogstashHandler(version=1,
                          host=host,
                          durable=True,
                          username=username,
                          password=password,
                          exchange=exchange))

# log
test_logger.error('python-logstash: test logstash error message.')
test_logger.info('python-logstash: test logstash info message.')
test_logger.warning('python-logstash: test logstash warning message.')

try:
  1/0
except:
  test_logger.exception('python-logstash: test logstash exception with stack trace')

不管怎么说，最后生成的格式是这样就可以了。

{
  "@source"=>"unknown",
  "@type"=>"nginx",
  "@tags"=>[],
  "@fields"=>{
    "remote_addr"=>"192.168.0.1",
    "remote_user"=>"-",
    "body_bytes_sent"=>"13988",
    "request_time"=>"0.122",
    "status"=>"200",
    "request"=>"GET /some/url HTTP/1.1",
    "request_method"=>"GET",
    "http_referrer"=>"http://www.example.org/some/url",
    "http_user_agent"=>"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.1 (KHTML, like Gecko) Chrome/21.0.1180.79 Safari/537.1"
  },
  "@timestamp"=>"2012-08-23T10:49:14+02:00"
}

看完上述内容，是不是对python串行执行和并行执行的方法有进一步的了解，如果还想学习更多内容，欢迎关注亿速云行业资讯频道。

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