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pythonmaopythonmao
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add some modules before
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‎modules_study/algorithm/algorithom_test.py

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from hashlib import *
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mm = md5()
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mm.update("asdf" + '1234dsgadsfa')
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print mm.digest()
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print mm.digest_size
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# print mm.digest.block_size
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mm = new("ripemd160")
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print mm.digest_size
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mm.update("asdf")
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print mm.digest()
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mm.update('1234dsgadsfa')
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print mm.digest()
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print mm.digest_size
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# dk = pbkdf2_hmac('sha256', b'password', b'salt', 100000)

‎modules_study/array/array_test.py

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sametype and control bit

‎modules_study/base/base_test.py

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import os
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# help(os)
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class test(object):
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pass
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mm = test()
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setattr(mm, 'a', 1)
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print dir(mm)
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print hasattr(mm, 'a')
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print '1+2'
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print eval('1+2')
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print vars(mm)
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print hash('a')
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# memoryview()
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print bytes('a')
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print bytes(1)
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print bytes("mm")
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print bytearray('123')

‎modules_study/bitsect/bitsect_test.py

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import bisect
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data=[1,2,3,4,5]
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bisect.bisect_left(data, 1)
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bisect.bisect_right(data, 1)
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bisect.insort_left(data, 2)
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bisect.insort_right(data, 2)
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bisect.insort(data,2)
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def index(a, x):
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'Locate the leftmost value exactly equal to x'
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i = bisect_left(a, x)
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if i != len(a) and a[i] == x:
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return i
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raise ValueError
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def find_lt(a, x):
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'Find rightmost value less than x'
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i = bisect_left(a, x)
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if i:
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return a[i-1]
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raise ValueError
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def find_le(a, x):
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'Find rightmost value less than or equal to x'
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i = bisect_right(a, x)
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if i:
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return a[i-1]
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raise ValueError
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def find_gt(a, x):
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'Find leftmost value greater than x'
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i = bisect_right(a, x)
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if i != len(a):
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return a[i]
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raise ValueError
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def find_ge(a, x):
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'Find leftmost item greater than or equal to x'
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i = bisect_left(a, x)
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if i != len(a):
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return a[i]
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raise ValueError
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def grade(score, breakpoints=[60, 70, 80, 90], grades='FDCBA'):
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i = bisect(breakpoints, score)
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return grades[i]
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[grade(score) for score in [33, 99, 77, 70, 89, 90, 100]]
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['F', 'A', 'C', 'C', 'B', 'A', 'A']

‎modules_study/collection/collection_test.py

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from collections import *
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# nn = ChainMap({'a':1, 'b':2}, {'c':3, 'd':4})
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count = Counter()
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for i in ['red', 'blue', 'red']:
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count[i] += 1
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print count
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print count.elements()
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import re
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# words = re.findall(r'\w+', open('hamlet.txt').read().lower())
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# Counter(words).most_common(10)
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"""
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>>> c = Counter(a=2, b=-4)
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>>> +c
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Counter({'a': 2})
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>>> -c
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Counter({'b': 4})
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>>> c = Counter(a=3, b=1)
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>>> d = Counter(a=1, b=2)
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>>> c + d # add two counters together: c[x] + d[x]
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Counter({'a': 4, 'b': 3})
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>>> c - d # subtract (keeping only positive counts)
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Counter({'a': 2})
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>>> c & d # intersection: min(c[x], d[x])
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Counter({'a': 1, 'b': 1})
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>>> c | d # union: max(c[x], d[x])
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Counter({'a': 3, 'b': 2})
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"""
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mm = deque()
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mm.append('a')
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mm.append('b')
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mm.append('c')
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mm.append('d')
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print mm
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mm.appendleft('e')
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print mm
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print mm.count('a')
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print mm.pop()
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print mm
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mm.rotate(2)
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print mm
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"""
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def tail(filename, n=10):
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'Return the last n lines of a file'
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with open(filename) as f:
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return deque(f, n)
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>>> s = [('yellow', 1), ('blue', 2), ('yellow', 3), ('blue', 4), ('red', 1)]
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>>> d = defaultdict(list)
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>>> for k, v in s:
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... d[k].append(v)
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...
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>>> sorted(d.items())
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[('blue', [2, 4]), ('red', [1]), ('yellow', [1, 3])]
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>>> # Basic example
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>>> Point = namedtuple('Point', ['x', 'y'])
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>>> p = Point(11, y=22) # instantiate with positional or keyword arguments
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>>> p[0] + p[1] # indexable like the plain tuple (11, 22)
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33
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>>> x, y = p # unpack like a regular tuple
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>>> x, y
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(11, 22)
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>>> p.x + p.y # fields also accessible by name
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33
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>>> p # readable __repr__ with a name=value style
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Point(x=11, y=22)
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>>> # regular unsorted dictionary
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>>> d = {'banana': 3, 'apple': 4, 'pear': 1, 'orange': 2}
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>>> # dictionary sorted by key
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>>> OrderedDict(sorted(d.items(), key=lambda t: t[0]))
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OrderedDict([('apple', 4), ('banana', 3), ('orange', 2), ('pear', 1)])
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>>> # dictionary sorted by value
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>>> OrderedDict(sorted(d.items(), key=lambda t: t[1]))
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OrderedDict([('pear', 1), ('orange', 2), ('banana', 3), ('apple', 4)])
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>>> # dictionary sorted by length of the key string
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>>> OrderedDict(sorted(d.items(), key=lambda t: len(t[0])))
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OrderedDict([('pear', 1), ('apple', 4), ('orange', 2), ('banana', 3)])
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"""
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‎modules_study/data_persistence/pickle_test.py

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#!--coding:utf-8--
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from pickle import *
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"""
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# 经常遇到在Python程序运行中得到了一些字符串、列表、字典等数据，想要长久的保存下来，
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# 方便以后使用，而不是简单的放入内存中关机断电就丢失数据。
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# 它是一个将任意复杂的对象转成对象的文本或二进制表示的过程。同样，必须能够将对象经过序列化后的形式恢复到原有的对象。
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# marshal和pickle的区别在于Marshal只能处理简单的Python对象
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"""
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from copyreg import *
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import copyreg, copy, pickle
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class C(object):
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def __init__(self, a):
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self.a = a
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def pickle_c(c):
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print("pickling a C instance...")
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return C, (c.a,)
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copyreg.pickle(C, pickle_c)
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c = C(1)
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d = copy.copy(c)
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p = pickle.dumps(c)

‎modules_study/data_persistence/shelve_test.py

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import shelve
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d = shelve.open('./test.dat', writeback=True)
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d['x'] = ['a', 'b', 'c']
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print d
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d.sync()
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d['x'].append('d')
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print d
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d.close()
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d = shelve.open('./test.dat')
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for i in d.items():
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print i
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d.close()
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"""
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dbm
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# 在一些python小型应用程序中，不需要关系型数据库时，
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# 可以方便的用持久字典来存储名称/值对，它与python的字典非常类似，
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# 主要区别在于数据是在磁盘读取和写入的。另一个区别在于dbm的键和值必须是字符串类型。
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python中的shelve模块，可以提供一些简单的数据操作
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他和python中的dbm很相似。
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区别如下：
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都是以键值对的形式保存数据，不过在shelve模块中，
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key必须为字符串，而值可以是python所支持的数据
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类型。在dbm模块中，键值对都必须为字符串类型。
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"""

‎modules_study/data_persistence/test.dat

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‎modules_study/datetime/datetime_test.py

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import datetime
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print datetime.datetime.now()
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print datetime.datetime.today()
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print datetime.datetime.utcnow()
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print datetime.MAXYEAR
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print datetime.MINYEAR
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mm = datetime.timedelta(days=365)
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mm1 = datetime.timedelta(days=364)
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print mm
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print abs(mm)
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print mm-mm1
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print mm.total_seconds()
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from datetime import date
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print date(2016, 8, 19)
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print date.today()
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import time
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nn = time.time()
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print nn
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print date.fromtimestamp(nn)
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#date2 = date1 + timedelta
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print date(2002,12,4).timetuple() #time.localtime()
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print date(2016,9,18).weekday()
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print date(2016,9,18).isoweekday()
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print date(2016,9,18).ctime()
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# print date.__format__(format) #date.strftime()
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# d = date.fromordinal(730920) # 730920th day after 1. 1. 0001
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# d.strftime("%d/%m/%y")
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import calendar
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print calendar.monthrange(2016, 9)
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print calendar.isleap(2016)
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# print calendar.monthdayscalendar(2016,9)
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‎modules_study/difflibs/difflib_test.py

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from difflib import *
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import sys
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s1 = ['bacon\n', 'eggs\n', 'ham\n', 'guido\n']
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s2 = ['python\n', 'eggy\n', 'hamster\n', 'guido\n']
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sys.stdout.writelines(context_diff(s1, s2, fromfile='before.py', tofile='after.py'))
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get_close_matches('appel', ['ape', 'apple', 'peach', 'puppy'])
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print '='*80
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diff = ndiff('one\ntwo\nthree'.splitlines(),'ore\ntree\nemu'.splitlines())
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# print ''.join(diff)
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print ' '.join(restore(diff, 1))
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sys.stdout.writelines(unified_diff(s1, s2, fromfile='before.py', tofile='after.py'))
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# difflib.IS_LINE_JUNK(line)
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# Return true for ignorable lines. The line line is ignorable if line is blank or contains a single '#'
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# difflib.IS_CHARACTER_JUNK(ch)
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# Return true for ignorable characters. The character ch is ignorable if ch is a space or tab,
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# difflib.diff_bytes(dfunc, a, b, fromfile=b'', tofile=b'', fromfiledate=b'', tofiledate=b'', n=3, lineterm=b'\n')
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# Compare a and b (lists of bytes objects) using dfunc
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s = SequenceMatcher(None, 'abc', 'ab')
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print s.ratio()
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s = SequenceMatcher(lambda x: x=='',
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"private private Thread currentThread;",
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"private volatile Thread currentThread;")
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print
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‎modules_study/enum/enum_type.py

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from enum import Enum
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class color(Enum):
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red = 1
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green = 2
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blue = 2
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color.red
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color.green
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mm = color(1)
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mm = color(2)
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color['red']
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mm = color['green']
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mm.name
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nn.value
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@unique
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class color(Enum):
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red = 1
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green = 2
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blue = 2
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list(color)
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for name, member in Shape.__members__.items():
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name, member
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('square', <Shape.square: 2>)
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('diamond', <Shape.diamond: 1>)
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('circle', <Shape.circle: 3>)
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('alias_for_square', <Shape.square: 2>)
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Color.red is Color.red
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Color.red is not Color.red
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Color.red == Color.red
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Note :Subclassing an enumeration is allowed only if the enumeration does not define any members
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Animal = Enum('Animal', 'ant bee cat dog')
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class Shape(IntEnum):
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circle = 1
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square = 2
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