Python基础：标准库和常用的第三方库「建议收藏」

from datetime import date
#导入时间库
now=date.today()
#取当前时间
print(now)
birthday=date(1987,12,3)
print(birthday)
age=now-birthday
#假设年龄=当前日期-生日日期
print(age)

import zlib
m = b'This is a test compress'
print(m)
m1=len(m)
#查看字符串的长度
print(m1)
t = zlib.compress(m)
#假设压缩后的内容为t
t1=len(t)
#查看压缩后内容t的长度
print(t)
print(t1)
s = zlib.decompress(t)
#解压缩后的内容为s
print(s)

>>> import zlib
>>> s = 'slfsjdalfkasflkkdkaleeeeeeeeeeeeeeeeeeeeeeeeeeeelaaalkllfksaklfasdll  kkkkkk123'
>>> zlib_s = zlib.compress(s)
>>> zlib_s
'x\x9c}\xca\xb1\r\xc0 \x10\x04\xc1Vh\xc1\xb8\xa2\x93\x9e\x0f|\x9b]\xff\x92\x11\x050\xf1\x84\xceW\xa2\xad4vY\xac\x0b$a\xf6\x8fL+\x05c\xf8x\xe6\xfb\x03\xf7\x97\x1e\xd1'

>>> print tlen(s)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'tlen' is not defined
>>> print len(s)
79
>>> print len(zlib_s)
55
>>> ss = zlib.decompress(zlib_s)
>>> ss
'slfsjdalfkasflkkdkaleeeeeeeeeeeeeeeeeeeeeeeeeeeelaaalkllfksaklfasdll  kkkkkk123'

import zlib
def compress(infile, dst, level=9):
    infile = open(infile, 'rb')
    dst = open(dst, 'wb')
    compress = zlib.compressobj(level)
    data = infile.read(1024)
    while data:
        dst.write(compress.compress(data))
        data = infile.read(1024)
    dst.write(compress.flush())
def decompress(infile, dst):
    infile = open(infile, 'rb')
    dst = open(dst, 'wb')
    decompress = zlib.decompressobj()
    data = infile.read(1024)
    while data:
        dst.write(decompress.decompress(data))
        data = infile.read(1024)
    dst.write(decompress.flush())
    
if __name__ == "__main__":
    infile = "1.txt"
    dst = "1.zlib.txt"
    compress(infile, dst)
    
    infile = "1.zlib.txt"
    dst = "2.txt"
    decompress(infile, dst)
    print "done~"

import sys
a=sys.path
#假设系统路径为a
print(a)

# coding=UTF-8

import urllib
url = 'https://blog.csdn.net/alice_tl'
wp = urllib.urlopen(url)
file_content = wp.read()

print file_content
#第一部分为获取网页源码

fp = open('alice.txt', 'wb') #打开一个文本文件
fp.write(file_content) #写入数据
fp.close() #关闭文件
#第二部分为将网页内容存入文件中

#第三部分为利用正则表达式将文件内容打印出来
import re

fp = open('alice.txt', 'rb')
content = fp.read()
fp.close()

title = re.search('<title>(.*?)</title>', content, re.S).group(1)

print 'title = ', title + '\n'

hrefPatten = 'href="(.*?)"'
hrefC = re.findall(hrefPatten, content, re.S)  #返回所有匹配正则表达式的值于列表中

print 'Allhref = ', hrefC

for h in hrefC :
    print h