阶段性总结-Python实战work example项目代码

1.Count email in a database

socket1.py

import socket

mysock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
mysock.connect(('data.pr4e.org', 80))
cmd = 'GET http://data.pr4e.org/romeo.txt HTTP/1.0\r\n\r\n'.encode()
mysock.send(cmd)

while True:
    data = mysock.recv(512)
    if len(data) < 1:
        break
    print(data.decode(),end='')

mysock.close()

socket2.py

import socket

# This is using HTTP 1.0 - not all servers support the oldest protocol
# Try http://data.pr4e.org/romeo.txt if your server fails.

url = input('Enter: ')
words = url.split('/')
host = words[2]

mysock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
mysock.connect((host, 80))
mysock.send(('GET '+url+' HTTP/1.0\r\n\r\n').encode())

while True:
    data = mysock.recv(512)
    if (len(data) < 1):
        break
    print(data.decode(), end='')

mysock.close()

2.Using Urllib and Beautiful Soap

bs4_1

# To run this, download the BeautifulSoup zip file
# http://www.py4e.com/code3/bs4.zip
# and unzip it in the same directory as this file

from urllib.request import urlopen
from bs4 import BeautifulSoup
import ssl
sum1 = 0

# Ignore SSL certificate errors
ctx = ssl.create_default_context()
ctx.check_hostname = False
ctx.verify_mode = ssl.CERT_NONE

url = input('Enter - ')
html = urlopen(url, context=ctx).read()
soup = BeautifulSoup(html, "html.parser")

# Retrieve all of the anchor tags
tags = soup('span')
#print(tags)
for tag in tags:
    num = tag.contents[0]
    #print(type(num))
    intnum = int(num)
    sum1 += intnum
print(sum1)
    # Look at the parts of a tag
    #print('TAG:', tag)
    #print('URL:', tag.get('href', None))
    #print('Contents:', tag.contents[0])
    #print('Attrs:', tag.attrs)
    
'''
for tag in tags:
    # Look at the parts of a tag
    print('TAG:', tag)
    print('URL:', tag.get('href', None))
    print('Contents:', tag.contents[0])
    print('Attrs:', tag.attrs)
'''

bs4_2

# To run this, download the BeautifulSoup zip file
# http://www.py4e.com/code3/bs4.zip
# and unzip it in the same directory as this file

import urllib.request, urllib.parse, urllib.error
from bs4 import BeautifulSoup
import ssl
namelist = list()
urlist = list()
i = 0

# Ignore SSL certificate errors
ctx = ssl.create_default_context()
ctx.check_hostname = False
ctx.verify_mode = ssl.CERT_NONE

#第一次读取url
url = input('Enter - ')
html = urllib.request.urlopen(url, context=ctx).read()
soup = BeautifulSoup(html, 'html.parser')
tags = soup('a')


#定义一个可供调用的，返回网址的函数
def Url_Read():
    for tag in tags:
        strurl = tag.get('href' , None)
        urlist.append(strurl)
    urlname = urlist[17]
    return urlname

#功能主体
while i<7:
    if i == 0:
        passurl = Url_Read()
        #print(passurl)
        i += 1
    elif (i == 1)|(i == 2)|(i == 3)|(i == 4)|(i == 5):
        html = urllib.request.urlopen(passurl, context=ctx).read()
        soup = BeautifulSoup(html, 'html.parser')
        tags = soup('a')
        urlist.clear()  #清空列表，很重要！
        passurl = Url_Read()
        #print(passurl)
        i += 1
    elif i ==6:
        html = urllib.request.urlopen(passurl, context=ctx).read()
        soup = BeautifulSoup(html, 'html.parser')
        tags = soup('a')
        for tag in tags:
            strname = tag.contents[0]
            namelist.append(strname)
            i += 1
print(namelist[17])
        

#print(Url_Read())

3.Extract data from XML

XML1

import urllib.request, urllib.parse, urllib.error
import xml.etree.ElementTree as ET
import ssl

# Ignore SSL certificate errors
ctx = ssl.create_default_context()
ctx.check_hostname = False
ctx.verify_mode = ssl.CERT_NONE


sumnum = 0
while True:
    address = input('Enter the url: ')
    if len(address) < 1:
        break  #这一块的作用是始终让url输入框出现，不是执行完一次就over了

    xml = urllib.request.urlopen(address , context=ctx).read()  #urllib库读取
    #print(xml)

    stuff = ET.fromstring(xml)  #返回的stuff是一个tree
    lst = stuff.findall('comments/comment')   #这里找三层目录反而找不到
    #print(len(lst))
    for item in lst:
        #print('Name:' , item.find('count').text)
        num = int(item.find('count').text)
        sumnum += num
    print(sumnum)

4.Json

geojson1.py

import urllib.request, urllib.parse, urllib.error
import json
import ssl
#导入相关模块

api_key = False
# If you have a Google Places API key, enter it here
# api_key = 'AIzaSy___IDByT70'
# https://developers.google.com/maps/documentation/geocoding/intro

if api_key is False:
    api_key = 42
    serviceurl = 'http://py4e-data.dr-chuck.net/json?'
else :
    serviceurl = 'https://maps.googleapis.com/maps/api/geocode/json?'

# Ignore SSL certificate errors
ctx = ssl.create_default_context()
ctx.check_hostname = False
ctx.verify_mode = ssl.CERT_NONE

while True:
    address = input('Enter location: ')
    if len(address) < 1: break   #实现连续交互的效果

    parms = dict()
    parms['address'] = address
    if api_key is not False: parms['key'] = api_key
    url = serviceurl + urllib.parse.urlencode(parms)

    print('Retrieving', url)
    uh = urllib.request.urlopen(url, context=ctx)
    data = uh.read().decode()
    print('Retrieved', len(data), 'characters')

    try:
        js = json.loads(data)
    except:
        js = None

    if not js or 'status' not in js or js['status'] != 'OK':
        print('==== Failure To Retrieve ====')
        print(data)
        continue

    print(json.dumps(js, indent=4))

    lat = js['results'][0]['geometry']['location']['lat']
    lng = js['results'][0]['geometry']['location']['lng']
    print('lat', lat, 'lng', lng)
    location = js['results'][0]['formatted_address']
    print(location)

geojson_test.py

import urllib.request, urllib.parse, urllib.error
import json
import ssl
#导入相关模块

api_key = False
# If you have a Google Places API key, enter it here
# api_key = 'AIzaSy___IDByT70'
# https://developers.google.com/maps/documentation/geocoding/intro

if api_key is False:
    api_key = 42
    serviceurl = 'http://py4e-data.dr-chuck.net/json?'
else :
    serviceurl = 'https://maps.googleapis.com/maps/api/geocode/json?'

# Ignore SSL certificate errors
ctx = ssl.create_default_context()
ctx.check_hostname = False
ctx.verify_mode = ssl.CERT_NONE

while True:
    address = input('Enter location: ')
    if len(address) < 1: break   #实现连续交互的效果

    parms = dict()
    parms['address'] = address
    if api_key is not False: parms['key'] = api_key
    url = serviceurl + urllib.parse.urlencode(parms)

    print('Retrieving', url)
    uh = urllib.request.urlopen(url, context=ctx)
    data = uh.read().decode()
    print('Retrieved', len(data), 'characters')

    try:
        js = json.loads(data)
    except:
        js = None

    if not js or 'status' not in js or js['status'] != 'OK':
        print('==== Failure To Retrieve ====')
        print(data)
        continue

    print(json.dumps(js, indent=4))

    lat = js['results'][0]['geometry']['location']['lat']
    lng = js['results'][0]['geometry']['location']['lng']
    print('lat', lat, 'lng', lng)
    location = js['results'][0]['formatted_address']
    print(location)

5.Count email in database

count_organization.py

import sqlite3

conn = sqlite3.connect('orgdb.sqlite')
cur = conn.cursor()

cur.execute('DROP TABLE IF EXISTS Counts')

cur.execute('''
CREATE TABLE Counts (org TEXT , count INTEGER)''')

fname = input('Enter the file name:')
if (len(fname) < 1):
    fname = 'mbox-short.txt'
fh = open(fname)
for line in fh:
    if not line.startswith('From:'):
        continue
    cut1 = line.split()
    email = cut1[1]
    cut2 = email.split('@')
    org = cut2[1]
    cur.execute('SELECT count FROM Counts WHERE org = ?' , (org,))
    row = cur.fetchone()
    if row is None:
        cur.execute('INSERT INTO Counts (org , count) VALUES (? , 1)' , (org,))
    else:
        cur.execute('UPDATE Counts SET count = count + 1 WHERE org = ?' , (org,))
    conn.commit()

# https://www.sqlite.org/lang_select.html
sqlstr = 'SELECT org , count FROM Counts ORDER BY count DESC LIMIT 10'

for row in cur.execute(sqlstr):
    print(str(row[0]) , row[1])

cur.close

6.Tracks-音乐软件

tracks.py

import xml.etree.ElementTree as ET
import sqlite3

conn = sqlite3.connect('trackdb.sqlite')
cur = conn.cursor()

# Make some fresh tables using executescript()
cur.executescript('''
DROP TABLE IF EXISTS Artist;
DROP TABLE IF EXISTS Genre;
DROP TABLE IF EXISTS Album;
DROP TABLE IF EXISTS Track;

CREATE TABLE Artist (
    id  INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT UNIQUE,
    name    TEXT UNIQUE
);

CREATE TABLE Genre (
    id  INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT UNIQUE,
    name    TEXT UNIQUE
);

CREATE TABLE Album (
    id  INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT UNIQUE,
    artist_id  INTEGER,
    title   TEXT UNIQUE
);

CREATE TABLE Track (
    id  INTEGER NOT NULL PRIMARY KEY 
        AUTOINCREMENT UNIQUE,
    title TEXT  UNIQUE,
    album_id  INTEGER,
    genre_id  INTEGER,
    len INTEGER, rating INTEGER, count INTEGER
);
''')


fname = input('Enter file name: ')
if ( len(fname) < 1 ) : fname = 'Library.xml'

# <key>Track ID</key><integer>369</integer>
# <key>Name</key><string>Another One Bites The Dust</string>
# <key>Artist</key><string>Queen</string>
def lookup(d, key):
    found = False
    for child in d:
        if found : return child.text
        if child.tag == 'key' and child.text == key :
            found = True
    return None

stuff = ET.parse(fname)
all = stuff.findall('dict/dict/dict')
print('Dict count:', len(all))
for entry in all:
    if ( lookup(entry, 'Track ID') is None ) : continue

    name = lookup(entry, 'Name')
    artist = lookup(entry, 'Artist')
    album = lookup(entry, 'Album')
    genre = lookup(entry, 'Genre')
    count = lookup(entry, 'Play Count')
    rating = lookup(entry, 'Rating')
    length = lookup(entry, 'Total Time')

    if name is None or artist is None or album is None or genre is None :  #Guardian Part
        continue

    print(name, artist, genre , album, count, rating, length)

    cur.execute('''INSERT OR IGNORE INTO Artist (name) 
        VALUES ( ? )''', ( artist, ) )
    cur.execute('SELECT id FROM Artist WHERE name = ? ', (artist, ))
    artist_id = cur.fetchone()[0]

    cur.execute('''INSERT OR IGNORE INTO Genre (name) 
            VALUES ( ? )''', (genre,))
    cur.execute('SELECT id FROM Genre WHERE name = ? ', (genre,))
    genre_id = cur.fetchone()[0]

    cur.execute('''INSERT OR IGNORE INTO Album (title, artist_id) 
        VALUES ( ?, ?  )''', ( album, artist_id   ) )
    cur.execute('SELECT id FROM Album WHERE title = ? ', (album, ))
    album_id = cur.fetchone()[0]

    cur.execute('''INSERT OR REPLACE INTO Track
        (title, album_id, genre_id , len, rating, count) 
        VALUES ( ?, ?, ? , ?, ?, ? )''',
        ( name, album_id, genre_id , length, rating, count ) )

    conn.commit()

7、多名学生与课程的数据库

many-to-many.py

import json
import sqlite3

conn = sqlite3.connect('rosterdb.sqlite')
cur = conn.cursor()

# Do some setup
#关于excutescript的作用，可以同时执行多条用分号隔开的语句
cur.executescript('''
DROP TABLE IF EXISTS User;
DROP TABLE IF EXISTS Member;
DROP TABLE IF EXISTS Course;

CREATE TABLE User (
    id     INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT UNIQUE,
    name   TEXT UNIQUE
);

CREATE TABLE Course (
    id     INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT UNIQUE,
    title  TEXT UNIQUE
);

CREATE TABLE Member (
    user_id     INTEGER,
    course_id   INTEGER,
    role        INTEGER,
    PRIMARY KEY (user_id, course_id)
)
''')

fname = input('Enter file name: ')
if len(fname) < 1:
    fname = 'roster_data.json'

# [
#   [ "Charley", "si110", 1 ],
#   [ "Mea", "si110", 0 ],

str_data = open(fname).read()
json_data = json.loads(str_data)

for entry in json_data:

    name = entry[0];
    title = entry[1];
    role = entry[2];

    print((name, title , role))

    cur.execute('''INSERT OR IGNORE INTO User (name)
        VALUES ( ? )''', ( name, ) )
    cur.execute('SELECT id FROM User WHERE name = ? ', (name, ))
    user_id = cur.fetchone()[0]

    cur.execute('''INSERT OR IGNORE INTO Course (title)
        VALUES ( ? )''', ( title, ) )
    cur.execute('SELECT id FROM Course WHERE title = ? ', (title, ))
    course_id = cur.fetchone()[0]

    cur.execute('''INSERT OR REPLACE INTO Member
        (user_id, course_id , role) VALUES ( ?, ? , ? )''',
        ( user_id, course_id  , role) )

    conn.commit()

8、Geocoding

geoload.py-读（parse）

import urllib.request, urllib.parse, urllib.error
import http
import sqlite3
import json
import time
import ssl
import sys

api_key = False
# If you have a Google Places API key, enter it here
# api_key = 'AIzaSy___IDByT70'

if api_key is False:
    api_key = 42
    serviceurl = "http://py4e-data.dr-chuck.net/json?"
else :
    serviceurl = "https://maps.googleapis.com/maps/api/geocode/json?"

# Additional detail for urllib
# http.client.HTTPConnection.debuglevel = 1

conn = sqlite3.connect('geodata.sqlite')
cur = conn.cursor()

cur.execute('''
CREATE TABLE IF NOT EXISTS Locations (address TEXT, geodata TEXT)''')

# Ignore SSL certificate errors
ctx = ssl.create_default_context()
ctx.check_hostname = False
ctx.verify_mode = ssl.CERT_NONE

fh = open("where.data")
count = 0
for line in fh:
    if count > 200 :
        print('Retrieved 200 locations, restart to retrieve more')
        break

    address = line.strip()
    print('')
    cur.execute("SELECT geodata FROM Locations WHERE address= ?",
        (memoryview(address.encode()), ))

    try:
        data = cur.fetchone()[0]
        print("Found in database ",address)
        continue
    except:
        pass

    parms = dict()
    parms["address"] = address
    if api_key is not False: parms['key'] = api_key
    url = serviceurl + urllib.parse.urlencode(parms)

    print('Retrieving', url)
    uh = urllib.request.urlopen(url, context=ctx)
    data = uh.read().decode()
    print('Retrieved', len(data), 'characters', data[:20].replace('\n', ' '))
    count = count + 1

    try:
        js = json.loads(data)
    except:
        print(data)  # We print in case unicode causes an error
        continue

    if 'status' not in js or (js['status'] != 'OK' and js['status'] != 'ZERO_RESULTS') :
        print('==== Failure To Retrieve ====')
        print(data)
        break

    cur.execute('''INSERT INTO Locations (address, geodata)
            VALUES ( ?, ? )''', (memoryview(address.encode()), memoryview(data.encode()) ) )
    conn.commit()
    if count % 10 == 0 :
        print('Pausing for a bit...')
        time.sleep(5)

print("Run geodump.py to read the data from the database so you can vizualize it on a map.")

geodump.py-与json交互

import sqlite3
import json
import codecs

conn = sqlite3.connect('geodata.sqlite')
cur = conn.cursor()

cur.execute('SELECT * FROM Locations')
fhand = codecs.open('where.js', 'w', "utf-8")
fhand.write("myData = [\n")
count = 0
for row in cur :
    data = str(row[1].decode())
    try: js = json.loads(str(data))
    except: continue

    if not('status' in js and js['status'] == 'OK') : continue

    lat = js["results"][0]["geometry"]["location"]["lat"]
    lng = js["results"][0]["geometry"]["location"]["lng"]
    if lat == 0 or lng == 0 : continue
    where = js['results'][0]['formatted_address']
    where = where.replace("'", "")
    try :
        print(where, lat, lng)

        count = count + 1
        if count > 1 : fhand.write(",\n")
        output = "["+str(lat)+","+str(lng)+", '"+where+"']"
        fhand.write(output)
    except:
        continue

fhand.write("\n];\n")
cur.close()
fhand.close()
print(count, "records written to where.js")
print("Open where.html to view the data in a browser")