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)
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