美文网首页Python三期爬虫作业
【Python爬虫】--第二周_2作业

【Python爬虫】--第二周_2作业

作者: _孙小籽 | 来源:发表于2017-07-28 10:03 被阅读12次

18

 # two argument
def print_two(*args):
    arg1, arg2 = args
    print("arg1: %r, arg2: %r"  % (arg1, arg2))

#The other two argument
def print_two_again(arg1, arg2):
    print("arg1: %r, arg2: %r" %(arg1, arg2))

#The one argument
def print_one(arg1):
    print("arg1: %r" % arg1)

def print_None():
    print("arg1:")

print_two("z", 3)
print_two_again("one", "two")
print_one("onlyone")
print_None()

19

#定义一个函数,需要两个参数
def chesses_and_crackers(chesses_count, boxes_and_crackers):
    print("You have %r chesses" % chesses_count)
    print("You have %r boxes and crackers" % boxes_and_crackers)
    print("Men, that's enough for a party!")
    print("Get a blanket. \n")

#调用函数,参数参数使用int
print("We can just give the function number directly.")
chesses_and_crackers(10, 20)

#给两个变量赋值,调用函数,参数使用已赋值过的变量
print("Or, we can use variable from our script:")
amount_of_chesses = 10
amount_of_crackers = 20
chesses_and_crackers(amount_of_chesses, amount_of_crackers)

#调用函数,参数使用计算式
print("We can even do math inside too")
chesses_and_crackers(10+3, 20+7)

#调用函数,参数使用变量加上常量的计算
print("And we can combine the two, variable and math")
chesses_and_crackers(amount_of_chesses + 10, 20 + amount_of_crackers)

#调用函数,一个参数使用变量,一个使用常量
print("And we can combine the two, variable or math")
chesses_and_crackers(amount_of_chesses, 20 )

20

from sys import argv

script, input_file = argv

def print_all(f):
    print(f.read())

def rewind(f):
    f.seek(0)

def print_a_line(line_count, f):
    print(line_count, f.readline())

current_file = open(input_file)

print_all(current_file)

print("Now let's rewind, kind of like a tape.")
rewind(current_file)

print("Let's print three lines:")
current_line = 1
print_a_line(current_line, current_file)
print_a_line(current_line + 1, current_file)
print_a_line(current_line + 2, current_file)

21

def add(a,b):
    print("ADDING %d + %d" %(a, b))
    return a + b

def subtract(a, b):
    print("SUBTRACTING %d - %d" %(a, b))
    return a - b

def multiply(a, b):
    print("MULTIPLY %d * %d" %(a,b))
    return a * b

def divide(a, b):
    print("DIVIDING %d / %d" %(a,b))
    return a / b

print("Let's do some math with just functions!")

age = add(30, 5)
height = subtract(78, 4)
weight = multiply(90, 2)
iq = divide(100, 2)

print("Age: %d, Height: %d, Weight: %d, IQ: %d" %(age, height, weight, iq))
print("Here is a puzzle.")
what = add(age, subtract(height, multiply(weight, divide(iq, 2))))
print("That becomes:", what, "can you do it by hard?")

23

import requests
from lxml import etree
from datetime import datetime as dt
#url变量
job_url='http://www.jianshu.com/p/5ddb3cda7c00'
#变量赋值为url请求的内容
html=requests.get(job_url).content
#解析html内容
selector=etree.HTML(html)
#作业名变量
file_base_name='作业_%s.txt'
#现在的时间变成字符串变量
create_time=dt.strftime(dt.now(),'%Y-%m-%d')
#正则表达式提取html文件中的title内容
title=selector.xpath('//div[@class="article"]/h1[@class="title"]/text()')[0].strip()
#则表达式提取html文件中的content内容
content_data=selector.xpath('//div[@class="show-content"]//text()')
#url
baidu_href='https://pan.baidu.com/s/1eSvg7HS'
#url
zhuanti_url='http://www.jianshu.com/c/1b31f26b6af0'
#文件名格式化字符串入时间的字符串
file_name=file_base_name%create_time
#打开文件名写入
with open(file_name,'w') as f:
    #写作业标题,写空行
    f.write('【作业标题】'+ title)
    f.write('\n')
    #写入专题url
    f.write('python三期爬虫作业交稿专题地址====》:' + zhuanti_url)
    f.write('\n')
    #
    f.write('本帖持续更新,录制视频资源及时更新在下面百度云下载链接 请及时查看群公告')
    f.write('\n')
    #写入百度云地址
    f.write('百度云下载链接:' + baidu_href)
    f.write('\n')
    #循环检查内容部分,以"百度"或者"群公告"开始的忽略,其余的打印并写入文件,然后退出循环
    for i in content_data:
        if i.startswith('百度') or  i.startswith('群公告'):
            continue
        else:
            print (i)
            f.write(i.strip())
            f.write('\n')
    f.close()

#### 24
print("Let's practice everything.")
print('You\'d need to know \'bout escapes with \\ that do \n newlines and \t tabs.')

poem = """
\tThe lovely world
with logic so firmly planted
cannot discern \n the needs of love nor comprehend passion from intuition and requires an explanation \n\t\twhere there is none.
"""
print("_________________")
print(poem)
print("_________________")

five = 10 -2 + 3 - 6
print("This should be five: %s" % five)

def secret_formula(started):
    jelly_beans = started * 500
    jars = jelly_beans / 1000
    crates = jars / 100
    return jelly_beans, jars, crates

start_point = 10000
beans, jars, crates = secret_formula(start_point)

print("With a starting point of: %d" % start_point)
print("We'd have %d beans, %d jars, and %d crates." % (beans, jars, crates))
start_point = start_point / 10

print("We can also do that this way:")
print("We'd have %d beans, %d jars, and %d crates." % secret_formula(start_point))

25

def break_words(stuff):
    """This function will break up words for us."""
    words = stuff.split(' ')
    return words

def sort_words(words):
    """Sorts the words."""
    return sorted(words)

def print_first_word(words):
    """Prints the first word after popping it off."""
    words = words.pop(0)
    print(words)

def print_last_word(words):
    """Prints the last word after popping it off."""
    word = words.pop(-1)
    print(word)

def sort_sentence(sentence):
    """Takes in a full sentence and returns the sorted words."""
    words = break_words(sentence)
    return sort_words(words)

def print_first_and_last(sentence):
    """Prints the first and last words of the sentence."""
    words = break_words(sentence)
    print_first_word(words)
    print_last_word(words)

def print_first_and_last_sorted(sentence):
    """Sorts the words then prints the first and last one."""
    words = sort_sentence(sentence)
    print_first_word(words)
    print_last_word(words)

words = input("...>... ")
print_first_and_last_sorted(words)
print_first_and_last(words)

26

def break_words(stuff):
    """This function will break up words for us."""
    words = stuff.split(' ')
    return words

def sort_words(words):
    """Sorts the words."""
    return sorted(words)

def print_first_word(words):
    """Prints the first word after popping it off."""
    word = words.pop(0)
    print(word)

def print_last_word(words):
    """Prints the last word after popping it off."""
    word = words.pop(-1)
    print(word)

def sort_sentence(sentence):
    """Takes in a full sentence and returns the sorted words."""
    words = break_words(sentence)
    return sort_words(words)

def print_first_and_last(sentence):
    """Prints the first and last words of the sentence."""
    words = break_words(sentence)
    print_first_word(words)
    print_last_word(words)

def print_first_and_last_sorted(sentence):
    """Sorts the words then prints the first and last one."""
    words = sort_sentence(sentence)
    print_first_word(words)
    print_last_word(words)


print("Let's practice everything.")
print('You\'d need to know \'bout escapes with \\ that do \n newlines and \t tabs.')

poem = """
\tThe lovely world
with logic so firmly planted
cannot discern \n the needs of love
nor comprehend passion from intuition
and requires an explantion
\n\t\twhere there is none.
"""


print("--------------")
print(poem)
print("--------------")

five = 10 - 2 + 3 - 5
print("This should be five: %s" % five)

def secret_formula(started):
    jelly_beans = started * 500
    jars = jelly_beans / 1000
    crates = jars / 100
    return jelly_beans, jars, crates


start_point = 10000
jelly_beans, jars, crates = secret_formula(start_point)

print("With a starting point of: %d" % start_point)
print("We'd have %d jeans, %d jars, and %d crates." % (jelly_beans, jars, crates))

start_point = start_point / 10

print("We can also do that this way:")
print("We'd have %d beans, %d jars, and %d crabapples." % secret_formula(start_point))


sentence = "All god\tthings come to those who weight."

words = break_words(sentence)
sorted_words = sort_words(words)

print_first_word(words)
print_last_word(words)
print_first_word(sorted_words)
print_last_word(sorted_words)
sorted_words = sort_sentence(sentence)
print(sorted_words)

print_first_and_last(sentence)

print_first_and_last_sorted(sentence)

相关文章

网友评论

    本文标题:【Python爬虫】--第二周_2作业

    本文链接:https://www.haomeiwen.com/subject/xejxlxtx.html