Python简介

本文是根据以下两个博客基础上，把整个环境与开发平台搭建好之后，所学习的代码。全程是按照 牛客网上面那个初级项目所指导的那样，一步一步来。

虽然视频仅仅只有1个小时，但是实际操作的时候，我自己是花费了大概3天的时间，才掌握熟悉这样的知识，具体深入部分必须等以后进一步需求时候才能用的着这些。

新手关于python2.7.11 与 IDE pycharm的安装与使用

python下安装easy_install、pip遇到的问题

整个运行环境都是基于pycharm中运行的。

Python简介

语法基础
控制流
数据结构
面向对象
异常
随机数/正则表达式

__author__ = 'wdd'

# print "hello world!"

# print "fuck u!"

import requests
import random
import re
from bs4 import BeautifulSoup


content = requests.get('https://user.qzone.qq.com/1125577106/mood').content
soup = BeautifulSoup(content, 'html.parser')

for div in soup.find_all('div', {'class': 'content'}):
   print div.text.strip()

def demo_string():
     stra = 'hello world'
     print stra.capitalize()
     print stra.replace('world', 'nowcoder')
     strb = ' \n\rhello nowcoder \r\n'
     print 1, strb.lstrip()
     print 2, strb.rstrip()
     strc = 'hello w'
     print 3, strc.startswith('hel')
     print 4, strc.endswith('x')
     print 5,  stra + strb + strc
     print 6, len(strc)
     print 7, '-'.join(['a', 'b', 'c'])
     print 8, strc.split(' ')

def demo_operation():
     print 1, 1 + 2, 5 / 2, 5 * 2, 5 - 2
     print 2, True, not True
     print 3, 1 < 2, 5 > 2
     print 4, 2 << 3
     print 5, 5 | 3, 5 & 3, 5 ^ 3
     x = 2
     y = 3.3
     print x, y, type(x), type(y)

def demo_buildinfunction():
     print 1, max(2, 1), min(5, 3)
     print 2, len('xxx'), len([1, 2, 3])
     print 3, abs(-2) # fabs, Math.fabs
     print 4, range(1, 10, 3)
     print 5, dir(list)
     x = 2
     print 6, eval('x + 3')
     print 7, chr(65), ord('a')
     print 8, divmod(11, 3)

def demo_contronflow():
    score = 65
    if score > 99:
        print 1, 'A'
    elif score > 60:
        print 2, 'B'
    else:
        print 3, 'C'

    while score < 100:
        print  score
        score += 10
    score = 65

    # for (int i = 0; i < 10; ++i)
    # continue, break, pass
    for i in range(0, 10, 2):
        if i == 0:
            #print 3, i
            pass #do_special
        if i < 5:
            continue
        print 3, i
        if i == 6:
            break

def demo_list():
     lista = [1, 2, 3] # vector Arraylist
     print 1,lista
     listb = ['a', 1, 'c', 1.1]
     print 2, listb
     lista.extend(listb)
     print 3, lista
     print 4, len(lista)
     print 5, 'a' in listb
     lista = lista + listb
     print 6, lista
     listb.insert(0,'www')
     print 7, listb
     listb.pop(1)
     print 8, listb
     listb.reverse()
     print 9, listb
     print 10, listb[0], listb[1]
     listb.sort()
     print 11, listb
     listb.sort(reverse=True)
     print 12, listb
     print 13, listb * 2
     print 14, [0] * 14
     tuplea =(1, 2, 3)
     listaa = [1, 2, 3]
     listaa.append(4)
     print 15, listaa

def add(a, b):
    return a + b

def sub(a, b):
    return a - b

def demo_dict():
    dicta = {4: 16, 1: 1, 2: 4, 3: 9}
    print 1, dicta
    print 2, dicta.keys(), dicta.values()
    print 3, dicta.has_key(1), dicta.has_key('3')
    for key, value in dicta.items():
        print 'key-value:', key, value
    # for map(int ,int)::iterator it = x.begin(); it ! = x.end(); it++
    dictb = {'+': add, '-': sub}
    print 4, dictb['+'](1, 2)
    print 5, dictb.get('-')(15, 3)
    dictb['*'] = 'x'
    print dictb
    dicta.pop(4)
    print 6,dicta
    del dicta[1]
    print 7, dicta

def demo_set():
     seta = set((1, 2, 3)) # lista = [1, 2, 3]  seta = set(liata)
     setb = set((2, 3, 4))
     print 1, seta
     # seta.add(4)
     # print 2, seta
     print 3, seta.intersection(setb), seta & setb
     print 4, seta | setb, seta.union(setb)
     print 5, seta - setb
     seta.add('x')
     print 6, seta
     print len(seta)
     print seta.isdisjoint(set((1, 2)))

class User:
    type = 'USER'

    def __init__(self, name, uid):
        self.name = name
        self.uid = uid

    def __repr__(self):
        return 'im ' + self.name + ' ' + str(self.uid)

class Admin(User):
    type = 'ADMIN'

    def __init__(self, name, uid, group):
        User.__init__(self, name, uid)
        self.group = group

    def __repr__(self):
        return 'im ' + self.name + ' ' + str(self.uid) + ' ' + self.group

class Guest(User):
    def __repr__(self):
        return 'im guest:' + self.name + ' ' + str(self.uid)

def create_user(type):
     if type == 'USER':
         return User('u1', 1)
     elif type == 'ADMIN':
         return Admin('a1', 101, 'g1')
     else:
         return Guest('gu1', 201)
         #  raise ValueError('error')

def demo_exception():
     try:
         print 2 / 1
         # print 2 / 0
         # if type == 'c':
         raise Exception('Raise Error', 'NowCoder')
     except Exception as e:
         print 'error:', e
     finally:
         print 'clean up'

def demo_random():
    # 1 - 100
    # random.seed(1)
    # x = prex * 100007 % xxxx
    # prex = x

    print 1, int(random.random() * 100)
    print 2, random.randint(0, 200)
    print 3, random.choice(range(0, 100, 10))
    print 4, random.sample(range(0, 100), 4)
    a = [1,2,3,4,5]
    random.shuffle(a)
    print 5, a

def demo_re():
     str = 'abc123def12gh15'
     p1 = re.compile('[\d]+')
     p2 = re.compile('\d')
     print p1.findall(str)
     print p2.findall(str)

     str = 'a@163.com;b@gmail.com;c@qq.com;e@163.com;z@qq.com'
     p3 = re.compile('[\w]+@[163|qq]+\.com')
     print p3.findall(str)

     str = '<html><h>title</h><body>xxx</body></html>'
     p4 = re.compile('<h>[^<]+</h>')
     print 4, p4.findall(str)
     p4 = re.compile('<h>([^<]+)</h><body>([^<]+)</body>')
     print 5, p4.findall(str)

     str = 'xx2016-06-11yy'
     p5 = re.compile('\d\d\d\d-\d\d-\d\d')
     print p5.findall(str)


if __name__=="__main__":


    '''
    user1 = User('u1', 1)
    print user1
    admin1 = Admin('a1', 101, 'g1')
    print admin1

    print create_user('USERX')
    '''
    # print 'hello nowcder'
    # comment
    # demo_string()
    # demo_operation()
    # demo_buildinfunction()
    # demo_contronflow()
    # demo_list()
    # demo_dict()
    # demo_set()
    # demo_exception()
    # demo_random()
    demo_re()

python初级项目课（一）

python初级项目课（二）