UUBlog

#!/usr/bin/env python
#coding:utf-8

from random import randint

"""
    词的频次统计
    统计重复的词的次数，用字典的形式展现
"""

data = [randint(0,10) for _ in xrange(0,20)]

print data

## 常规处理
# 根据键生成一个字典，赋值0
ddata = dict.fromkeys(data,0)

print ddata
# 迭代统计
for x in data:
    ddata[x]+=1

print ddata

## 用collections 的counter

from collections import Counter

ddata2 = Counter(data)

# 统计最高的4位
print ddata2.most_common(4)

#!/usr/bin/env python
#coding:utf-8

from random import randint

"""
    列表筛选
    生成一个有20个随机数的数组 data
    从 data 列表中筛选出大于0的数字
"""

data = [randint(-100,100) for _ in xrange(10)]

print data

## 迭代
def test1(d):
    s = []
    for x in data:
        if x >=0:
            s.append(x)
    return s

## 用filter
def test2(d):
    return filter(lambda x:x>=0,d)

## 用列表解析
def test3(d):
    return [x for x in data if x>=0]

print test1(data)
print test2(data)
print test3(data)

##  迭代最慢、列表解析最快

"""
    字典的筛选
    生成键值在56-100之间的随机数10个
    找出大于90的数
"""

data = {x:randint(56,100) for x in xrange(1,11)}
print data

def test4(d):
    return {k:v for k,v in d.iteritems() if v>=90}

print test4(data)

import socket
#import codecs

#encoder = codecs.getencoder("utf-8")
senddata = '{"action":"compute","device":"ios","map":"0","start":"2017-05-19","day":"25","type":"17","orientation":"0","order_total_id":"950","store_id":"12"}EOF\n'

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect(('dev.xxxx.net', 31))
s.send(senddata)

buffer = []
while True:
    d = s.recv(65535)
    if d:
        buffer.append(d)
    else:
        break
    if 'EOF' in d[-5:-1]:
        break
# while True:
#     d = s.recv(1024)
#     if d:
#         buffer.append(d)
#     else:
#         break
data = ''.join(buffer)
print data
s.close()

#!/bin/env python
#coding:utf-8
from collections import deque
import datetime

# 递归版
def fibonacci(num):
    if num<=2:
        return 1
    else:
        return fibonacci(num-1)+fibonacci(num-2)

# 迭代版
def fibonacci2(num):
    s=deque()
    result=0
    for i in range(1,num+1):
        if i<=2:
            result=1
            s.append(result)
        else:
            result=s[0]+s[1]
            s.append(result)
            s.popleft()
    return result


n=40
print(datetime.datetime.now())
print('fibonacci(%d)=%d' % (n, fibonacci(n)))
print(datetime.datetime.now())
print('fibonacci2(%d)=%d' % (n, fibonacci2(n)))
print(datetime.datetime.now())

ImportError:an import fails 导入失败，一般导入了无效的模块
IndexError:a list is indexed with an out of range number 超出列表最大长度
NameError:an unknown variable is used 未定义的变量
SyntaxError:the code can't be parsed properly 不能匹配的语法
TypeError:a funxtion is called on a value of an inappropriate type 错误的类型
ValueError:a function is called on a value of the correct type but with an inappropriate value 错误的值

try:
    # do sth
except <具体要接管的错误类型，留空则接管所有异常>:
    # 异常处理部分

try:
    result = 1 / 0
except ZeroDivisionError:
    print('error')

try:
    result = 1 / 0
except:
    print('error')

try:
    result = 1 / 0
except ZeroDivisionError:
    print('ZeroDivisionError')
except IOError:
    print('IOError')

In [1]: import exceptions

In [2]: dir(exceptions)
Out[2]: 
['ArithmeticError',
 'AssertionError',
 'AttributeError',
 'BaseException',
 'BufferError',
 'BytesWarning',
 'DeprecationWarning',
 'EOFError',
 'EnvironmentError',
 'Exception',
 'FloatingPointError',
 'FutureWarning',
 'GeneratorExit',
 'IOError',
 'ImportError',
 'ImportWarning',
 'IndentationError',
 'IndexError',
 'KeyError',
 'KeyboardInterrupt',
 'LookupError',
 'MemoryError',
 'NameError',
 'NotImplementedError',
 'OSError',
 'OverflowError',
 'PendingDeprecationWarning',
 'ReferenceError',
 'RuntimeError',
 'RuntimeWarning',
 'StandardError',
 'StopIteration',
 'SyntaxError',
 'SyntaxWarning',
 'SystemError',
 'SystemExit',
 'TabError',
 'TypeError',
 'UnboundLocalError',
 'UnicodeDecodeError',
 'UnicodeEncodeError',
 'UnicodeError',
 'UnicodeTranslateError',
 'UnicodeWarning',
 'UserWarning',
 'ValueError',
 'Warning',
 'ZeroDivisionError',
 '__doc__',
 '__name__',
 '__package__']

try:
    result = 1 / 0
finally:
    print('still working.')

try:
    f = open('test.txt','wb')
    result = 1 / 0
finally:
    f.close()

with open("test.txt","wb") as f:
    result = 1 / 0
    #or do sth.