万字长文Python面试题，年后找工作就靠这了

mystr='luobodazahui'
mystr[1:3]

'uo'

mystr2 = "welcome to luobodazahui, dear {name}"
mystr2.format(name="baby")

'welcome to luobodazahui, dear baby'

mylist = ['luo', 'bo', 'da', 'za', 'hui']
mystr3 = '-'.join(mylist)
print(mystr3)

'luo-bo-da-za-hui'

mystr4 = 'luobodazahui-haha'
print(mystr4.replace('haha', 'good'))

luobodazahui-good

mystr5 = 'luobo,dazahui good'
# 以空格分割
print(mystr5.split())
# 以h分割
print(mystr5.split('h'))
# 以逗号分割
print(mystr5.split(','))

['luobo,dazahui', 'good']
['luobo,daza', 'ui good']
['luobo', 'dazahui good']

mylist1 = [1, 2]
mylist2 = [3, 4]
mylist3 = [1, 2]
mylist1.append(mylist2)
print(mylist1)
mylist3.extend(mylist2)
print(mylist3)

[1, 2, [3, 4]]
[1, 2, 3, 4]

mylist4 = ['a', 'b', 'c', 'd']
del mylist4[0]
print(mylist4)
mylist4.pop()
print(mylist4)
mylist4.remove('c')
print(mylist4)

['b', 'c', 'd']
['b', 'c']
['b']

mylist5 = [1, 5, 2, 3, 4]
mylist5.sort()
print(mylist5)
mylist5.reverse()
print(mylist5)

[1, 2, 3, 4, 5]
[5, 4, 3, 2, 1]

dict1 = {'key1':1, 'key2':2}
dict1.clear()
print(dict1)

{}

dict1 = {'key1':1, 'key2':2}
d1 = dict1.pop('key1')
print(d1)
print(dict1)

1
{'key2': 2}

dict2 = {'key1':1, 'key2':2}
mykey = [key for key in dict2]
print(mykey)
myvalue = [value for value in dict2.values()]
print(myvalue)
key_value = [(k, v) for k, v in dict2.items() ]
print(key_value)

['key1', 'key2']
[1, 2]
[('key1', 1), ('key2', 2)]

keys = ['zhangfei', 'guanyu', 'liubei', 'zhaoyun']
dict.fromkeys(keys, 0)

{'zhangfei': 0, 'guanyu': 0, 'liubei': 0, 'zhaoyun': 0}

"中文".encode('utf-8')

b'\xe4\xb8\xad\xe6\x96\x87'

b'\xe4\xb8\xad\xe6\x96\x87'.decode('utf-8')

'中文'

a = 1
b = 2
a, b = b, a
print(a, b)

2 1

c = d = [1,2]
e = [1,2]
print(c is d)
print(c == d)
print(c is e)
print(c == e)

True
True
False
True

id(c)
id(d)
id(e)

188748080
288748080
388558288

def test(*arg, **kwarg):
    if arg:
        print("arg:", arg)
    if kwarg:
        print("kearg:", kwarg)
test('ni', 'hao', key='world')

arg: ('ni', 'hao')
kearg: {'key': 'world'}

sum(range(1, 101))

import time
import datetime
print(datetime.datetime.now())
print(time.strftime('%Y-%m-%d %H:%M:%S'))

12019-06-07 18:12:11.165330
22019-06-07 18:12:11

import copy
list1 = [1, 2, 3, [1, 2]]
list2 = copy.copy(list1)
list2.append('a')
list2[3].append('a')
print(list1, list2)

[1, 2, 3, [1, 2, 'a']] [1, 2, 3, [1, 2, 'a'], 'a']

import copy
list1 = [1, 2, 3, [1, 2]]
list3 = copy.deepcopy(list1)
list3.append('a')
list3[3].append('a')
print(list1, list3)

[1, 2, 3, [1, 2]] [1, 2, 3, [1, 2, 'a'], 'a']

def num():
    return [lambda x:i*x for i in range(4)]
print([m(1) for m in num()])

[3, 3, 3, 3]

for i in range(1, 10):
    for j in range(1, i+1):
        print("%s*%s=%s " %(i, j, i*j), end="")
    print()

11*1=1 
22*1=2 2*2=4 
33*1=3 3*2=6 3*3=9 
44*1=4 4*2=8 4*3=12 4*4=16 
55*1=5 5*2=10 5*3=15 5*4=20 5*5=25 
66*1=6 6*2=12 6*3=18 6*4=24 6*5=30 6*6=36 
77*1=7 7*2=14 7*3=21 7*4=28 7*5=35 7*6=42 7*7=49 
88*1=8 8*2=16 8*3=24 8*4=32 8*5=40 8*6=48 8*7=56 8*8=64 
99*1=9 9*2=18 9*3=27 9*4=36 9*5=45 9*6=54 9*7=63 9*8=72 9*9=81 

mylist = [1, 2, 3, 4, 5, 6, 7, 8, 9]
list(filter(lambda x: x%2 == 1, mylist))

[1, 3, 5, 7, 9]

mylist = [1, 2, 3, 4, 5, 6, 7, 8, 9]
list(map(lambda x: x*2, mylist))

[2, 4, 6, 8, 10, 12, 14, 16, 18]

from functools import reduce
reduce(lambda x, y: x+y, range(101))

15050

a, b = 1, 2
# 若果 a>b 成立  就输出  a-b  否则 a+b
h = a-b if a>b else a+b

13

print(random.random())
print(random.randint(1, 100))
print(random.uniform(1,5))

10.03765019937131564
218
31.8458555362279228

list1 = ['zhangfei', 'guanyu', 'liubei', 'zhaoyun']
list2 = [0, 3, 2, 4]
list(zip(list1, list2))

[('zhangfei', 0), ('guanyu', 3), ('liubei', 2), ('zhaoyun', 4)]

def test(L=[]):
    L.append('test')
    print(L)

test() # ['test']
test() # ['test', 'test']

mystr = '1,2,3'
mystr.split(',')

['1', '2', '3']

mylist = ['1', '2', '3']
list(map(lambda x: int(x), mylist))

[1, 2, 3]

mylist = [1, 2, 3, 4, 5, 5]
list(set(mylist))

from collections import Counter
mystr = 'sdfsfsfsdfsd,were,hrhrgege.sdfwe!sfsdfs'
Counter(mystr)

 Counter({'s': 9,
          'd': 5,
          'f': 7,
          ',': 2,
          'w': 2,
          'e': 5,
          'r': 3,
          'h': 2,
          'g': 2,
         '.': 1,
         '!': 1})

[x for x in range(10) if x%2 == 1]

[1, 3, 5, 7, 9]

list1 = [[1,2],[3,4],[5,6]]
[j for i in list1 for j in i]

[1, 2, 3, 4, 5, 6]

 def binary_search(data, item):
     # 递归
     n = len(data)
     if n > 0:
         mid = n // 2
         if data[mid] == item:
             return True
         elif data[mid] > item:
             return binary_search(data[:mid], item)
        else:
            return binary_search(data[mid+1:], item)
    return False
list1 = [1,4,5,66,78,99,100,101,233,250,444,890]
binary_search(list1, 999)

 def binary_search(data, item):
     # 非递归
     n = len(data)
     first = 0
     last = n - 1
     while first <= last:
         mid = (first + last)//2
         if data[mid] == item:
             return True
        elif data[mid] > item:
            last = mid - 1
        else:
            first = mid + 1
    return False
list1 = [1,4,5,66,78,99,100,101,233,250,444,890]
binary_search(list1, 99)

import json
dict1 = {'zhangfei':1, "liubei":2, "guanyu": 4, "zhaoyun":3}
myjson = json.dumps(dict1)
myjson

'{"zhangfei": 1, "liubei": 2, "guanyu": 4, "zhaoyun": 3}'

mydict = json.loads(myjson)
mydict

{'zhangfei': 1, 'liubei': 2, 'guanyu': 4, 'zhaoyun': 3}

import random
td_list=[i for i in range(10)]
print("列表推导式", td_list, type(td_list))
ge_list = (i for i in range(10))
print("生成器", ge_list)
dic = {k:random.randint(4, 9)for k in ["a", "b", "c", "d"]}
print("字典推导式",dic,type(dic))

列表推导式 [0, 1, 2, 3, 4, 5, 6, 7, 8, 9] <class 'list'>
生成器 <generator object <genexpr> at 0x0139F070>
字典推导式 {'a': 6, 'b': 5, 'c': 8, 'd': 9} <class 'dict'>

list2 = [1, 2, 3, 4, 5, 6]
random.shuffle(list2)
print(list2)

[4, 6, 5, 1, 2, 3]

str1 = 'luobodazahui'
str1[::-1]

'iuhazadoboul'

 class A():
     def funcA(self):
         print("this is func A")
 class B(A):
     def funcA_in_B(self):
         super(B, self).funcA()

     def funcC(self):
         print("this is func C")

ins = B()
ins.funcA_in_B()
ins.funcC()

this is func A
this is func C

def func1():
    pass
print(func1)

<function func1 at 0x01379348>

 class People(object):
     def func2(self):
         pass
     @staticmethod
     def func3():
         pass
     @classmethod
     def func4(cls):
         pass
people = People()
print(people.func2)
print(people.func3)
print(people.func4)

<bound method People.func2 of <__main__.People object at 0x013B8C90>>
<function People.func3 at 0x01379390>
<bound method People.func4 of <class '__main__.People'>>

 class A(object):
     pass
 class B(A):
     pass
 a = A()
 b = B()
 print(isinstance(a, A))
 print(isinstance(b, A))
 print(type(a) == A)
 print(type(b) == A)

True
True
True
False

import os
print(os.listdir('.'))

 # 1到5组成的互不重复的三位数
 k = 0
 for i in range(1, 6):
     for j in range(1, 6):
         for z in range(1, 6):
             if (i != j) and (i != z) and (j != z):
                 k += 1
                 if k%6:
                     print("%s%s%s" %(i, j, z), end="|")
                else:
                    print("%s%s%s" %(i, j, z))

 1123|124|125|132|134|135
 2142|143|145|152|153|154
 3213|214|215|231|234|235
 4241|243|245|251|253|254
 5312|314|315|321|324|325
 6341|342|345|351|352|354
 7412|413|415|421|423|425
 8431|432|435|451|452|453
 9512|513|514|521|523|524
10531|532|534|541|542|543

str1 = "   hello nihao    "
str1.strip()

'hello nihao'

str2 = "hello you are good"
print(str2.replace(" ", ""))
"".join(str2.split(" "))

helloyouaregood
'helloyouaregood'

print("This is for %s" % "Python")
print("This is for %s, and %s" %("Python", "You"))

This is for Python
This is for Python, and You

print("This is my {}".format("chat"))
print("This is {name}, hope you can {do}".format(name="zhouluob", do="like"))

This is my chat
This is zhouluob, hope you can like

name = "luobodazahui"
print(f"hello {name}")

hello luobodazahui

def mytest(name, age):
    return f"hello {name}, you are {age} years old!"
people = mytest("luobo", 20)
print(people)

hello luobo, you are 20 years old!

str1 = "hello world"
print(str1.title())
" ".join(list(map(lambda x: x.capitalize(), str1.split(" "))))

Hello World
'Hello World'

list1 = [1, 2, 3]
list(map(lambda x: str(x), list1))

['1', '2', '3']

a = ("zhangfei", "guanyu")
b = (66, 80)
dict(zip(a,b))

{'zhangfei': 66, 'guanyu': 80}

a = (1,2,3,[4,5,6,7],8)
a[3] = 2

TypeError                                 Traceback (most recent call last)
<ipython-input-35-59469d550eb0> in <module>
      1 a = (1,2,3,[4,5,6,7],8)
----> 2 a[3] = 2
      3 #a

TypeError: 'tuple' object does not support item assignment

a = (1,2,3,[4,5,6,7],8)
a[3][2] = 2
a

(1, 2, 3, [4, 5, 2, 7], 8)

class NewClass(object):
    def __init__(self, name, male):
        self.name = name
        self.male = male
    def myname(self):
        print(f'My name is {self.name}')
    def mymale(self):
        print(f'I am a {self.male}')
people = NewClass('luobo', 'boy')
print(hasattr(people, 'name'))
print(getattr(people, 'name'))
setattr(people, 'male', 'girl')
print(getattr(people, 'male'))

True
luobo
girl

from flask import Flask, request
app = Flask(__name__)

@app.route('/', methods=['POST'])
def simple_api():
    result = request.get_json()
    return result


if __name__ == "__main__":
    app.run()

class MyMetaclass(type):
    def __new__(cls, class_name, class_parents, class_attr):
        class_attr['print'] = "this is my metaclass's subclass %s" %class_name
        return type.__new__(cls, class_name, class_parents, class_attr)
class MyNewclass(object, metaclass=MyMetaclass):
    pass

myinstance = MyNewclass()
myinstance.print

"this is my metaclass's subclass MyNewclass"

dict1 = {'test1':1, 'test2':2}
list1 = [2, 1, 3]
print(list1.sort())
list1

None
[1, 2, 3]

dict1 = {'test1':1, 'test2':2}
list1 = [2, 1, 3]
print(sorted(dict1))
print(sorted(list1))

['test1', 'test2']
[1, 2, 3]

import random
"".join(random.choice(string.printable[:-7]) for i in range(8))

'd5^NdNJp'

print('hello\nworld')
print(b'hello\nworld')
print(r'hello\nworld')

hello
world
b'hello\nworld'
hello\nworld

list1 = [{'name': 'guanyu', 'age':29},
        {'name': 'zhangfei', 'age': 28},
        {'name': 'liubei', 'age':31}]
sorted(list1, key=lambda x:x['age'])

[{'name': 'zhangfei', 'age': 28},
 {'name': 'guanyu', 'age': 29},
 {'name': 'liubei', 'age': 31}]

print(all([1, 2, 3, 0]))
print(all([1, 2, 3]))
print(any([1, 2, 3, 0]))
print(any([0, None, False]))

False
True
True
False

def reverse_int(x):
    if not isinstance(x, int):
        return False
    if -10 < x < 10:
        return x
    tmp = str(x)
    if tmp[0] != '-':
        tmp = tmp[::-1]
        return int(tmp)
    else:
        tmp = tmp[1:][::-1]
        x = int(tmp)
        return -x
reverse_int(-23837)

-73832

def sum(*args):
    def inner_sum():
        tmp = 0
        for i in args:
            tmp += i
        return tmp
    return inner_sum
mysum = sum(2, 4, 6)
print(type(mysum))
mysum()

<class 'function'>
12

import time
def log(func):
    def inner_log(*args, **kw):
        print("Call: {}".format(func.__name__))
        return func(*args, **kw)
    return inner_log


@log
def timer():
    print(time.time())

timer()

Call: timer
1560171403.5128365

def fib(n):
    if n == 0:
        return False
    if not isinstance(n, int) or (abs(n) != n): # 判断是正整数
        return False
    a, b = 0, 1
    while n:
        a, b = b, a+b
        n -= 1
        yield a

[i for i in fib(10)]

[1, 1, 2, 3, 5, 8, 13, 21, 34, 55]

def fib(n):
    if n == 0:
        return False
    if not isinstance(n, int) or (abs(n) != n):
        return False
    if n <= 1:
        return n
    return fib(n-1)+ fib(n-2)

[fib(i) for i in range(1, 11)]

[1, 1, 2, 3, 5, 8, 13, 21, 34, 55]

import re
str1 = 'hello world:luobo dazahui'
result = re.split(r":| ", str1)
print(result)

['hello', 'world', 'luobo', 'dazahui']

def foryield():
    print("start test yield")
    while True:
        result = yield 5
        print("result:", result)
g = foryield()
print(next(g))
print("*"*20)
print(next(g))

start test yield
5
********************
result: None
5

list1 = [2, 5, 8, 9, 3, 11]
def paixu(data, reverse=False):
    if not reverse:
        for i in range(len(data) - 1):
            for j in range(len(data) - 1 - i):
                if data[j] > data[j+1]:
                    data[j], data[j+1] = data[j+1], data[j]
        return data
    else:
        for i in range(len(data) - 1):
            for j in range(len(data) - 1 - i):
                if data[j] < data[j+1]:
                    data[j], data[j+1] = data[j+1], data[j]
        return data

print(paixu(list1, reverse=True))

[11, 9, 8, 5, 3, 2]

list1 = [8, 5, 1, 3, 2, 10, 11, 4, 12, 20]
def partition(arr,low,high): 
    i = ( low-1 )         # 最小元素索引
    pivot = arr[high]     

    for j in range(low , high): 

        # 当前元素小于或等于 pivot 
        if   arr[j] <= pivot: 

            i = i+1 
            arr[i],arr[j] = arr[j],arr[i] 

    arr[i+1],arr[high] = arr[high],arr[i+1] 

    return ( i+1 )

def quicksort(arr,low,high): 
    if low < high: 

        pi = partition(arr,low,high) 

        quicksort(arr, low, pi-1) 
        quicksort(arr, pi+1, high) 


quicksort(list1, 0, len(list1)-1)

print(list1)

[1, 2, 3, 4, 5, 8, 10, 11, 12, 20]

def quick_sort(arr):
    if arr == []:
        return []
    else:
        first = arr[0]
        left = quick_sort([l for l in arr[1:] if l < first])
        right = quick_sort([r for r in arr[1:] if r >= first])
        return left + [first] + right
arr = [1, 4, 5, 2, 0, 8, 11, 6]
result = quick_sort(arr)
print(result)

[0, 1, 2, 4, 5, 6, 8, 11]

import requests

url = "http://www.luobodazahui.top"


response = requests.get(url)  # 获得请求

response.encoding = "utf-8"  # 改变其编码

html = response.text  # 获得网页内容

binary__content = response.content  # 获得二进制数据

raw = requests.get(url, stream=True)  # 获得原始响应内容

headers = {'user-agent': 'my-test/0.1.1'}  # 定制请求头
r = requests.get(url, headers=headers)

cookies = {"cookie": "# your cookie"}  # cookie的使用
r = requests.get(url, cookies=cookies)

dict1 = {"zhangfei": 12, "guanyu": 13, "liubei": 18}
dict2 = {"zhangfei": 12, "guanyu": 13, "liubei": 18}
def compare_dict(dict1, dict2):
    issame = []
    for k in dict1.keys():
        if k in dict2:
            if dict1[k] == dict2[k]:
                issame.append(1)
            else:
                issame.append(2)
        else:
            issame.append(3)
    print(issame)
    sum_except = len(issame)
    sum_actually = sum(issame)
    if sum_except == sum_actually:
        print("this two dict are same!")
        return True
    else:
        print("this two dict are not same!")
        return False

test = compare_dict(dict1, dict2)

[1, 1, 1]
this two dict are same!

def forinput():
    input_text = input()
    print("your input text is: ", input_text)
forinput()

hello
your input text is:  hello

data1 = ['one', 'two', 'three', 'four']
for i, enu in enumerate(data1):
    print(i, enu)

0 one
1 two
2 three
3 four

def forpass(n):
    if n == 1:
        pass
    else:
        print('not 1')
forpass(1)

import re
email_list= ["test01@163.com","test02@163.123", ".test03g@qq.com", "test04@gmail.com" ]
for email in email_list:
    ret = re.match("[\w]{4,20}@(.*)\.com$",email)
    if ret:
        print("%s 是符合规定的邮件地址，匹配后结果是:%s" % (email,ret.group()))
    else:
        print("%s 不符合要求" % email)

test01@163.com 是符合规定的邮件地址，匹配后结果是:test01@163.com
test02@163.123 不符合要求
.test03g@qq.com 不符合要求
test04@gmail.com 是符合规定的邮件地址，匹配后结果是:test04@gmail.com

str2 = 'werrQWSDdiWuW'
counter = 0
for i in str2:
    if i.isupper():
        counter += 1
print(counter)

6

import json
dict1 = {'name': '萝卜', 'age': 18}
dict1_new = json.dumps(dict1)
print(dict1_new)

{"name": "\u841d\u535c", "age": 18}

import json
dict1 = {'name': '萝卜', 'age': 18}
dict1_new = json.dumps(dict1, ensure_ascii=False)
print(dict1_new)

{"name": "萝卜", "age": 18}

help(dict)

Help on class dict in module builtins:

class dict(object)
 |  dict() -> new empty dictionary
 |  dict(mapping) -> new dictionary initialized from a mapping object's
 |      (key, value) pairs
 |  dict(iterable) -> new dictionary initialized as if via:
 |      d = {}
 |      for k, v in iterable:
 |          d[k] = v
 |  dict(**kwargs) -> new dictionary initialized with the name=value pairs
 |      in the keyword argument list.  For example:  dict(one=1, two=2)
......

dir(dict)

['__class__',
 '__contains__',
 '__delattr__',
 '__delitem__',
 '__dir__',
 '__doc__',
 '__eq__',
 '__format__',
 '__ge__',
 '__getattribute__',
 '__getitem__',
......

print(5//3)
print(5/3)
print(5%3)
print(5**3)

1
1.6666666666666667
2
125

def test_raise(n):
    if not isinstance(n, int):
        raise Exception('not a int type')
    else:
        print('good')
test_raise(8.9)

Exception                                 Traceback (most recent call last)
<ipython-input-262-b45324f5484e> in <module>
      4     else:
      5         print('good')
----> 6 test_raise(8.9)

<ipython-input-262-b45324f5484e> in test_raise(n)
      1 def test_raise(n):
      2     if not isinstance(n, int):
----> 3         raise Exception('not a int type')
      4     else:
      5         print('good')

Exception: not a int type

tuple1 = (1, 2, 3, 4)
list1 = list(tuple1)
print(list1)
tuple2 = tuple(list1)
print(tuple2)

[1, 2, 3, 4]
(1, 2, 3, 4)

def testassert(n):
    assert n == 2, "n is not 2"
    print('n is 2')
testassert(1)

AssertionError                            Traceback (most recent call last)
<ipython-input-268-a9dfd6c79e73> in <module>
      2     assert n == 2, "n is not 2"
      3     print('n is 2')
----> 4 testassert(1)

<ipython-input-268-a9dfd6c79e73> in testassert(n)
      1 def testassert(n):
----> 2     assert n == 2, "n is not 2"
      3     print('n is 2')
      4 testassert(1)

AssertionError: n is not 2

import os
f = open('test.txt', 'w')
f.close()
os.listdir()
os.remove('test.txt')

import logging
logging.debug("debug log")
logging.info("info log")
logging.warning("warning log")
logging.error("error log")
logging.critical("critica log")

WARNING:root:warning log
ERROR:root:error log
CRITICAL:root:critica log

from collections import Counter
str1 = "nihsasehndciswemeotpxc"
print(Counter(str1))

Counter({'s': 3, 'e': 3, 'n': 2, 'i': 2, 'h': 2, 'c': 2, 'a': 1, 'd': 1, 'w': 1, 'm': 1, 'o': 1, 't': 1, 'p': 1, 'x': 1})

import re
str1 = '我是周萝卜，今年18岁'
result = re.sub(r"\d+","20",str1)
print(result)

我是周萝卜，今年20岁

import socket
import threading
def tcplink(sock, addr):
    print('Accept new connection from %s:%s...' % addr)
    sock.send(b'Welcome!')
    while True:
        data = sock.recv(1024)
        time.sleep(1)
        if not data or data.decode('utf-8') == 'exit':
            break
        sock.send(('Hello, %s!' % data.decode('utf-8')).encode('utf-8'))
    sock.close()
    print('Connection from %s:%s closed.' % addr)

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
# 监听端口:
s.bind(('127.0.0.1', 9999))
s.listen(5)
print('Waiting for connection...')
while True:
    # 接受一个新连接:
    sock, addr = s.accept()
    # 创建新线程来处理TCP连接:
    t = threading.Thread(target=tcplink, args=(sock, addr))
    t.start()

import socket
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
# 建立连接:
s.connect(('127.0.0.1', 9999))
# 接收欢迎消息:
print(s.recv(1024).decode('utf-8'))
for data in [b'Michael', b'Tracy', b'Sarah']:
    # 发送数据:
    s.send(data)
    print(s.recv(1024).decode('utf-8'))
s.send(b'exit')
s.close()

from multiprocessing import Pool
import os
import time
import random


def long_time_task(name):
    print('Run task %s (%s)...' % (name, os.getpid()))
    start = time.time()
    time.sleep(random.random() * 3)
    end = time.time()
    print('Task %s runs %0.2f seconds.' % (name, (end - start)))


def test_pool():
    print('Parent process %s.' % os.getpid())
    p = Pool(4)
    for i in range(5):
        p.apply_async(long_time_task, args=(i,))
    print('Waiting for all subprocesses done...')
    p.close()
    p.join()
    print('All subprocesses done.')


if __name__ == '__main__':
    test_pool()

Parent process 32432.
Waiting for all subprocesses done...
Run task 0 (15588)...
Run task 1 (32372)...
Run task 2 (12440)...
Run task 3 (18956)...
Task 2 runs 0.72 seconds.
Run task 4 (12440)...
Task 3 runs 0.82 seconds.
Task 1 runs 1.21 seconds.
Task 0 runs 3.00 seconds.
Task 4 runs 2.95 seconds.
All subprocesses done.

def test_future_process():
    print('Parent process %s.' % os.getpid())
    p = ProcessPoolExecutor(4)
    for i in range(5):
        p.submit(long_time_task, i)
    p.shutdown(wait=True)
    print('Finish')


if __name__ == '__main__':
    # test_pool()
    test_future_process()

Parent process 29368.
Run task 0 (32148)...
Run task 1 (31552)...
Run task 2 (24012)...
Run task 3 (29408)...
Task 2 runs 0.52 seconds.
Run task 4 (24012)...
Task 3 runs 0.86 seconds.
Task 1 runs 1.81 seconds.
Task 0 runs 1.83 seconds.
Task 4 runs 1.69 seconds.
Finish

def sayhello(a):
    print("hello: " + a)
    start = time.time()
    time.sleep(random.random() * 3)
    end = time.time()
    print('Task %s runs %0.2f seconds.' % (a, (end - start)))


def test_future_thread():
    seed = ["a", "b", "c", "d"]
    start = time.time()
    with ThreadPoolExecutor(3) as executor:
        for i in seed:
            executor.submit(sayhello, i)
    end = time.time()
    print("Thread Run Time: " + str(end - start))

hello: a
hello: b
hello: c
Task a runs 0.40 seconds.
hello: d
Task b runs 0.56 seconds.
Task d runs 1.70 seconds.
Task c runs 2.92 seconds.
Thread Run Time: 2.9195945262908936

def write(q):
    print("write(%s), 父进程为(%s)" % (os.getpid(), os.getppid()))
    for i in "Python":
        print("Put %s to Queue" % i)
        q.put(i)


def read(q):
    print("read(%s), 父进程为(%s)" % (os.getpid(), os.getppid()))
    for i in range(q.qsize()):
        print("read 从 Queue 获取到消息： %s" % q.get(True))


def test_commun():
    print("(%s) start" % os.getpid())
    q = Manager().Queue()
    pw = Process(target=write, args=(q, ))
    pr = Process(target=read, args=(q, ))
    pw.start()
    pr.start()
    pw.join()
    pr.terminate()

(23544) start
write(29856), 父进程为(23544)
Put P to Queue
Put y to Queue
Put t to Queue
Put h to Queue
Put o to Queue
Put n to Queue
read(25016), 父进程为(23544)
read 从 Queue 获取到消息：P
read 从 Queue 获取到消息：y
read 从 Queue 获取到消息：t
read 从 Queue 获取到消息：h
read 从 Queue 获取到消息：o
read 从 Queue 获取到消息：n

import redis

# 创建一个 redis 连接池
def redis_conn_pool():
    pool = redis.ConnectionPool(host='redis-host', port=redis-port,
                                decode_responses=True, password='redis-pwd')
    r = redis.Redis(connection_pool=pool)
    return r

if __name__ == "__main__":
    conn = redis.Redis(host='',
                       port=12143, password='')

    ps = conn.pubsub()
    ps.subscribe('chat')  # 从 chat 订阅消息
    for item in ps.listen():  # 监听状态：有消息发布了就拿过来
        if item['type'] == 'message':
            print(item)
            print(item['channel'])
            print(item['data'])

if __name__ == "__main__":
    number_list = ['300033', '300032', '300031', '300030']
    signal = ['1', '-1', '1', '-1']
    pool = redis.ConnectionPool(host='redis-12143.c8.us-east-1-3.ec2.cloud.redislabs.com', port=12143,
                                decode_responses=True, password='pkAWNdYWfbLLfNOfxTJinm9SO16eSJFx')
    r = redis.Redis(connection_pool=pool)
    for i in range(len(number_list)):
        value_new = str(number_list[i]) + ' ' + str(signal[i])
        print(value_new)
        r.publish("chat", value_new)

import redis
con = redis.Redis()
con.keys(pattern='key*') # *代表通配符

class Zhan:
    def __init__(self,conn):
        self.conn = conn
    def push(self,val):
        self.conn.rpush('aaa',val)
    def pop(self):
        return self.conn.rpop('aaa')

class Dui:
    def __init__(self,conn):
        self.conn = conn
    def push(self,val):
        self.conn.rpush('bbb',val)
    def get(self):
        return self.conn.lpop('bbb')

class Xu:
    def __init__(self,conn):
        self.conn = conn
    def push(self,val,count):
        self.conn.zadd('ccc',val,count)
    def get(self):
        a = self.conn.zrange('ccc', 0, 0)[0]
        self.conn.zrem('ccc', a)
        return a

def list_iter(name):
    """
    自定义redis列表增量迭代
    :param name: redis中的name，即：迭代name对应的列表
    :return: yield 返回 列表元素
    """
    list_count = r.llen(name)
    for index in xrange(list_count):
        yield r.lindex(name, index)

$(function(){
    $('#send').click(function(){
         $.ajax({
             type: "GET",
             url: "test.json",
             data: {username:$("#username").val(), content:$("#content").val()},
             dataType: "json",
             success: function(data){
                         $('#resText').empty();   //清空resText里面的所有内容
                         var html = ''; 
                         $.each(data, function(commentIndex, comment){
                               html += '<div class="comment"><h6>' + comment['username']
                                         + ':</h6><p class="para"' + comment['content']
                                         + '</p></div>';
                         });
                         $('#resText').html(html);
                      }
         });
    });
});

var xhr = new XMLHttpRequest();
    setInterval(function(){
        xhr.open('GET','/user');
        xhr.onreadystatechange = function(){

        };
        xhr.send();
    },1000)

    function ajax(){
        var xhr = new XMLHttpRequest();
        xhr.open('GET','/user');
        xhr.onreadystatechange = function(){
              ajax();
        };
        xhr.send();
    }

from django.db import connection
cursor = connection.cursor()
cursor.execute("SELECT DATE_FORMAT(create_time, '%Y-%m') FROM blog_article;")
ret = cursor.fetchall()
print(ret)

url = "http://www.baidu.com/"
request = requests.get(url)
html = request.content
soup = BeautifulSoup(html, "html.parser", from_encoding="utf-8")

from selenium import webdriver
browser = webdriver.Chrome()
browser.get('https://www.taobao.com')
print(browser.page_source) # browser.page_source 是获取网页的全部 html
browser.close()