1、 Read txt file
# Read stu_info.txt The contents of the document , And display the names of all students in the file
f = open('stu_info.txt', 'r')
lines = f.readlines()
print(lines)
for line in lines:
print(line.split(',')[0])
f.close()2、CSV File read and write
'''
Reading and writing csv file ,csv Comma separated values (Comma-Separated Values,CSV),
Sometimes referred to as character separated values , Its files store tabular data in plain text ( Numbers and text )
'''
import csv
fr=open('stu_info.csv', 'r')
csv_file = csv.reader(fr)
for stu in csv_file:
print(stu)
fr.close()
# Yes stu_info.csv Two student information are added to the file Marry and Rom
stu=['Marry',28,'Changsha']
stu1=['Rom',23,'Chengdu']
out=open('stu_info.csv','a',newline='')
csv_write=csv.write(out,dialect='excel')
csv_write.writerow(stu)
csv_write.writerow(stu1)
out.close()3、 Read xml File element node
<?xml version="1.0" encoding="UTF-8"?> <Class> <student> <name>Jack</name> <age>28</age> <city>Beijing</city> </student> <student> <name>Bob</name> <age>22</age> <city>Shanghai</city> </student> <student> <name>Marry</name> <age>89</age> <city>Shenzhen</city> </student> <student> <name>Marry</name> <age>89</age> <city>Shenzhen</city> </student> <teacher> <name>Nancy</name> <age>90</age> <city>Shenzhen</city> </teacher> <account> <login username="student" password="123456"/> <login username="teacher" password="88888888"/> </account> </Class>
# see class_info.xml In the document Class Node pair attribute ( The name of the node 、 Node values , Node type )
from xml.dom import minidom
# load xml file
dom=minidom.parse('class_info.xml')
# load dom Object elements
root=dom.documentElement
# Print node information
print(root.nodeName)
print(root.nodeValue)
print(root.nodeType)
'''
nodeName The name of the node
nodeValue Returns the value of the text node
nodeType attribute , Returns the node type of the node specified by a numeric value
If the node is an element node , be nodeType Property will return 1
If the node is an attribute node , be nodeType Property will return 2
'''4、 Read xml Text node
# Print out separately class_info.xml It contains detailed information about students and teachers ( full name 、 Age 、 City )
from xml.dom import minidom
# Get the value of the tag pair
dom=minidom.parse('class_info.xml')
# Get document object elements
root=dom.documentElement
# Get the label object according to the label name
names=root.getElementsByTagName('name')
ages=root.getElementsByTagName('age')
citys=root.getElementsByTagName('city')
# Print and display separately xml The document label is for the inside and for the content
for i in range(4):
print(names[i].firstChild.data)
print(ages[i].firstChild.data)
print(citys[i].firstChild.data)
print("----------------")5、 Read xml The value of the file attribute node
# Read the value of the attribute node ： Read and print the account and password of teachers and students respectively
from xml.dom import minidom
dom = minidom.parse('class_info.xml')
root = dom.documentElement
logins = dom.documentElement
logins = root.getElementsByTagName('login')
# obtain login label username attribute
for i in range(2):
username = logins[i].getAttribute('username')
print(username)
password = logins[i].getAttribute('password')
print(password)6、 Read the child node information
'''
Read the child node information
nodeName The name of the node
nodeValue Node values
nodeType Node type
'''
from xml.dom import minidom
dom=minidom.parse('class_info.xml')
root=dom.documentElement
tags=root.getElementsByTagName('student')
print(tags[0].nodeName)
print(tags[0].tagName)
print(tags[0].nodeType)
print(tags[0].nodeValue)7、 Multithreading
# Multithreading
from time import ctime, sleep
import threading
def talk(content, loop):
for i in range(loop):
print('Start Talk %s %s' % (content, ctime()))
sleep(3)
def write(content, loop):
for i in range(loop):
print('Start Write %s %s' % (content, ctime()))
sleep(2)
# Define and load read / write threads
threads = []
t1 = threading.Thread(target=talk, args=('Speak: Hello world', 5))
threads.append(t1)
# Execute multithreading
t2 = threading.Thread(target=write, args=('Write: gogogo', 5))
threads.append(t2)
if __name__ == '__main__':
for t in threads:
t.start()
for t in threads:
t.join()
print('All the End %r' % ctime())8、 Multi process
# Multi process
from time import ctime, sleep
import multiprocessing
def talk(content, loop):
for i in range(loop):
print('Start Talk %s %s' % (content, ctime()))
sleep(3)
def write(content, loop):
for i in range(loop):
print('Start Write %s %s' % (content, ctime()))
sleep(2)
# Define and load read / write processes
processs = []
p1 = multiprocessing.Process(target=talk, args=('Speak: Hello world', 5))
processs.append(p1)
# Execute multithreading
p2 = multiprocessing.Process(target=write, args=('Write: gogogo', 5))
processs.append(p2)
if __name__ == '__main__':
for p in processs:
p.start()
for p in processs:
p.join()
print('All the End %r' % ctime())
