>>>importcopy>>>b=copy.deepcopy(a)

>>>mylist=[1,3,3] >>>mylist[1]=2>>>mytuple=(1,3,3) >>>mytuple[1]=2Traceback (mostrecentcalllast): File"<pyshell#97>", line1, in<module>mytuple[1]=2

TypeError: ‘tuple’ objectdoesnotsupportitemassignment

>>>a=7.0>>>

>>>colors=['red','green','blue'] >>> type(colors) <class'list'>

>>>name=('Ayushi','Sharma') >>>name[0]='Avery'Traceback (mostrecentcalllast): File"<pyshell#129>", line1, in<module>name[0]='Avery'

>>>squares={1:1,2:4,3:9,4:16,5:25} >>> type(squares) <class'dict'>>>>type({}) <class'dict'>

>>>squares={x:x**2forxinrange(1,6)} >>>squares{1: 1, 2: 4, 3: 9, 4: 16, 5: 25}

>>> type('227') <class'str'>>>>type(int('227')) <class'int'>

>>> type(a) <class'str'>

>>>a*=2>>>a ’77’

>>>a=int(input('Enter a number'))

>>>a*=2>>>a14

>>>myset={1,3,2,2} >>>myset{1, 2, 3}

>>>myset[0] Traceback (mostrecentcalllast): File"<pyshell#197>", line1, in<module>myset[0]

>>>myset=frozenset([1,3,2,2]) >>>mysetfrozenset({1, 2, 3}) >>> type(myset) <class'frozenset'>

>>>fromrandomimportrandom>>>random() 0.7931961644126482

>>>help(random)

random(…) methodofrandom.Randominstancerandom() ->xintheinterval [0, 1).

>>>fromrandomimportrandint>>>randint(2,7) 6>>>randint(2,7) 5>>>randint(2,7) 7>>>randint(2,7) 6

>>>'ayushi'.capitalize() ‘Ayushi’ >>>type(str.capitalize) <class'method_descriptor'>

>>>'@yushi'.capitalize() ‘@yushi’

>>>'Ayushi123'.isalnum() True>>>'Ayushi123!'.isalnum() False

>>>'123.3'.isdigit() False>>>'123'.isnumeric() True>>>'ayushi'.islower() True>>>'Ayushi'.isupper() False>>>'Ayushi'.istitle() True>>>' '.isspace() True>>>'123F'.isdecimal() False

>>>'32'+'32' ‘3232’ >>> [1,2,3]+[4,5,6] [1, 2, 3, 4, 5, 6] >>> (2,3)+(4) Traceback (mostrecentcalllast): File"<pyshell#256>", line1, in<module> (2,3)+(4)

>>> (2,3)+(4,) (2, 3, 4)

>>>defcounterfunc(n): while(n==7):print(n) >>>counterfunc(7) 77777777Traceback (mostrecentcalllast): File"<pyshell#332>", line1, in<module>counterfunc(7) File"<pyshell#331>", line2, incounterfuncwhile(n==7):print(n) KeyboardInterrupt>>>

>>>a,b=2,3>>>min=aifa<belseb>>>min

>>>roots={25:5,16:4,9:3,4:2,1:1} >>> type(roots) <class'dict'>>>>roots[9]

>>>roots={x**2:xforxinrange(5,0,-1)} >>>roots

>>>deffunc(*args): foriinargs: print(i) >>>func(3,2,1,4,7)

>>>deffunc(**kwargs): foriinkwargs: print(i,kwargs[i]) >>>func(a=1,b=2,c=7)

>>>mylist=[0,1,2,3,4,5,6,7,8]

>>>mylist[-3]

>>>mylist[-6:-1]

>>>myname='Ayushi'>>>MynameTraceback (mostrecentcalllast): File"<pyshell#3>", line1, in<module>

>>>'AyuShi'.lower()

>>>'AyuShi'.upper()

>>>'AyuShi'.isupper() False>>>'AYUSHI'.isupper() True>>>'ayushi'.islower() True>>>'@yu$hi'.islower() True>>>'@YU$HI'.isupper() True

>>>deffunc(*args): pass>>>

>>>foriinrange(7): ifi==3: breakprint(i)

>>>foriinrange(7): ifi==3: continueprint(i)

>>>13%76>>>3.5%1.50.5

>>>a=7>>>a+=1>>>a8>>>a-=1>>>a7>>>a*=2>>>a14>>>a/=2>>>a7.0>>>a**=2>>>a49>>>a//=3>>>a16.0>>>a%=4>>>a0.0

>>>FalseandTrueFalse>>>7<7orTrueTrue>>>not2==2False

>>>'me'in'disappointment'True>>>'us'notin'disappointment'True

>>>10is'10'False>>>TrueisnotFalseTrue

>>>defsayhi(): """用该函数打印Hi"""print("Hi") >>>sayhi() Hi

要想获取一个函数的docstring，我们使用它的_doc_属性。 >>>sayhi.__doc__ ‘\n\tThisfunctionprintsHi\n\t’

mystr='luobodazahui'mystr[1:3]

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

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)

mylist4= ['a', 'b', 'c', 'd'] delmylist4[0] print(mylist4) mylist4.pop() print(mylist4) mylist4.remove('c') print(mylist4)

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

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

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

dict2={'key1':1, 'key2':2} mykey= [keyforkeyindict2] print(mykey) myvalue= [valueforvalueindict2.values()] print(myvalue) key_value= [(k, v) fork, vindict2.items() ] print(key_value)

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

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

>>>mydict={'a':1,'b':2,'c':3,'e':5} >>>mydict.keys() dict_keys(['a', 'b', 'c', 'e'])

>>>a,b,c=3,4,5#This assigns 3, 4, and 5 to a, b, and c respectively>>>a=b=c=3#This assigns 3 to a, b, and c

>>>mytuple=3,4,5>>>mytuple (3, 4, 5)

>>>importcopy>>>help(copy.copy)

Helponfunctioncopyinmodulecopy: copy(x) ShallowcopyoperationonarbitraryPythonobjects. Seethemodule’s__doc__stringformoreinfo.

[‘__annotations__’, ‘__call__’, ‘__class__’, ‘__closure__’, ‘__code__’, ‘__defaults__’, ‘__delattr__’, ‘__dict__’, ‘__dir__’, ‘__doc__’, ‘__eq__’, ‘__format__’, ‘__ge__’, ‘__get__’, ‘__getattribute__’, ‘__globals__’, ‘__gt__’, ‘__hash__’, ‘__init__’, ‘__init_subclass__’, ‘__kwdefaults__’, ‘__le__’, ‘__lt__’, ‘__module__’, ‘__name__’, ‘__ne__’, ‘__new__’, ‘__qualname__’, ‘__reduce__’, ‘__reduce_ex__’, ‘__repr__’, ‘__setattr__’, ‘__sizeof__’, ‘__str__’, ‘__subclasshook__’]

>>>defA(x): defB(): print(x) returnB>>>A(7)()

>>>classA: deffunc(self): print("Hi") >>>defmonkey(self): print"Hi, monkey">>>m.A.func=monkey>>>a=m.A() >>>a.func()

>>>deffacto(n): ifn==1: return1returnn*facto(n-1) >>>facto(4) 24

>>>defsquares(n): i=1while(i<=n): yieldi**2i+=1>>>foriinsquares(7): print(i) 14916253649

odds=iter([1,3,5,7,9])

>>>next(odds) 1>>>next(odds) 3>>>next(odds) 5>>>next(odds) 7>>>next(odds) 9

>>>next(odds) Traceback (mostrecentcalllast): File"<pyshell#295>", line1, in<module>next(odds) StopIteration

>>>importos>>>os.chdir('C:\\Users\\lifei\\Desktop') >>>withopen('Today.txt') astoday: count=0foriintoday.read(): ifi.isupper(): count+=1print(count)

>>>' Ayushi '.lstrip()

>>>' Ayushi '.rstrip()

>>>fromrandomimportshuffle>>>shuffle(mylist) >>>mylist

>>>','.join('12345')

>>>'1,2,3,4,5'.split(',')

>>>defgreater(a,b): 返回aifa>belseb>>>greater(3,3.5) 3.5

>>>list(zip(['a','b','c'],[1,2,3])) [(‘a’, 1), (‘b’, 2), (‘c’, 3)]

>>>list(zip(('a','b','c'),(1,2,3))) [(‘a’, 1), (‘b’, 2), (‘c’, 3)]

>>>importos>>>os.getcwd() 'C:\\Users\\lifei\\AppData\\Local\\Programs\\Python\\Python36-32'>>> type(os.getcwd) <class'builtin_function_or_method'>

>>>os.chdir('C:\\Users\\lifei\\Desktop') >>>os.getcwd() 'C:\\Users\\lifei\\Desktop'

>>>importre>>>rhyme=re.search('.ake','I would make a cake, but I hate to bake') >>>rhyme.group() 'make'

>>>importos>>>os.chdir('C:\\Users\\lifei\\Desktop')

>>>forlineinreversed(list(open('Today.txt'))): print(line.rstrip()) containeritertoolsDebuggerThissem’ssubjectsPython, C++, JavaHTML, CSS, jQuery, JavaScriptOS, DBMS, DS, ADA

importthreadingglobal_num=0deftest1(): globalglobal_numforiinrange(1000000): global_num+=1print("test1", global_num) deftest2(): globalglobal_numforiinrange(1000000): global_num+=1print("test2", global_num) t1=threading.Thread(target=test1) t2=threading.Thread(target=test2) t1.start() t2.start()

importthreadingimporttimeglobal_num=0lock=threading.Lock() deftest1(): globalglobal_numlock.acquire() foriinrange(1000000): global_num+=1lock.release() print("test1", global_num) deftest2(): globalglobal_numlock.acquire() foriinrange(1000000): global_num+=1lock.release() print("test2", global_num) t1=threading.Thread(target=test1) t2=threading.Thread(target=test2) start_time=time.time() t1.start() t2.start()

>>>a="first">>>b="second">>>1andaorb# 输出内容为 'first'>>>0andaorb# 输出内容为 'second'

>>>a="">>>b="second">>>1andaorb# 输出内容为 'second'复制代码

defchoose(bool, a, b): return (booland [a] or [b])[0]

>>>myset={1,3,2,2} >>>myset{1, 2, 3}

>>>myset={1,3,2,2} >>>myset{1, 2, 3} >>>myset[0] Traceback (mostrecentcalllast): File"<pyshell#11>", line1, in<module>myset[0] TypeError: 'set'objectdoesnotsupportindexing>>>

>>>myset=frozenset([1,3,2,2]) >>>mysetfrozenset({1, 2, 3}) >>> type(myset) <class'frozenset'>>>>

importsysprint('hello') sys.stdout.write('hello') print('world') # 结果:# hello# helloworld复制代码

importsysa=sys.stdin.readline() print(a, len(a)) b=input() print(b, len(b)) # 结果:# hello# hello# 6# hello# hello 5复制代码

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

temp_tuple= (1,2,3,4,5)

>>>importre>>>print(re.match('hello','helloworld').span()) # 开头匹配到 (0, 5) >>>print(re.match('hello','nicehelloworld').span()) # 开头没有匹配到Traceback (mostrecentcalllast): File"<pyshell#2>", line1, in<module>print(re.match('hello','nicehelloworld').span()) AttributeError: 'NoneType'objecthasnoattribute'span'>>>

>>>print(re.search('a','abc')) <_sre.SRE_Matchobject; span=(0, 1), match='a'>>>>print(re.search('a','bac').span()) (1, 2) >>>

>>>a='hello'>>>b='hello'>>>print(aisb) True>>>print(a==b) True>>>a='hello world'>>>b='hello world'>>>print(aisb) False>>>print(a==b) True>>>a= [1,2,3] >>>b= [1,2,3] >>>print(aisb) False>>>print(a==b) True>>>a= [1,2,3] >>>b=a>>>print(aisb) True>>>print(a==b) True>>>

>>>a=247>>>b=247>>>print(aisb) True>>>a=258>>>b=258>>>print(aisb) False>>>复制代码

>>>a=5>>>b=6>>>a=a+b>>>b=a-b>>>a=a-b

>>>a=a^b>>>b=b^a>>>a=a^b

a,b=b,a

importrandomrandom.randint(1,10) 复制代码

importrandomrandom.random() # 利用np.random.randn(5)生成5个随机小数importnumpyasnpnp.random.randn(5) 复制代码

assert1==1assert2+2==2*2assertlen(['my boy',12])<10assertrange(4)==[0,1,2,3] 复制代码

classfunction_demo(object): name='demo'defrun(self): return"hello function"functiondemo=function_demo() res=hasattr(functiondemo, "name") # 判断对象是否有name属性，Trueres=hasattr(functiondemo, "run") # 判断对象是否有run方法，Trueres=hasattr(functiondemo, "age") # 判断对象是否有age属性，Falseprint(res)

functiondemo=function_demo() getattr(functiondemo, "name")# 获取name属性，存在就打印出来 --- demogetattr(functiondemo, "run") # 获取run 方法，存在打印出方法的内存地址getattr(functiondemo, "age") # 获取不存在的属性，报错getattr(functiondemo, "age", 18)# 获取不存在的属性，返回一个默认值

classfunction_demo(object): name="demo"defrun(self): return"hello function"functiondemo=function_demo() res=hasattr(functiondemo, "age") # 判断age属性是否存在，Falseprint(res) setattr(functiondemo, "age", 18) # 对age属性进行赋值，无返回值res1=hasattr(functiondemo, "age") # 再次判断属性是否存在，True

classfunction_demo(object): name="demo"defrun(self): return"hello function"functiondemo=function_demo() res=hasattr(functiondemo, "addr") # 先判断是否存在ifres: addr=getattr(functiondemo, "addr") print(addr) else: addr=getattr(functiondemo, "addr", setattr(functiondemo, "addr", "北京首都")) print(addr)

deff(x,l=[]): foriinrange(x): l.append(i*i) print(l) f(2) f(3,[3,2,1]) f(3)

deff(2,l=[]): foriinrange(2): # i=0,1l.append(i*i) # [0,1]print(l)

deff(3,l=[3,2,1]): foriinrange(3): # i=0,1,2l.append(i*i) # [3,2,1,0,1,4]print(l)

deff(3,l=[]): foriinrange(3): # i=0,1,2l.append(i*i) # [0,1,4] ???对吗？print(l)

my_list= [1,1,2,2,3,3,5,6,7,88] my_set=set(my_list) my_list= [xforxinmy_set] my_list

ids= [1,1,2,2,3,3,5,6,7,88] news_ids= [] foridinids: ifidnotinnews_ids: news_ids.append(id) print(news_ids)

my_list=[1,1,2,2,3,3,5,6,7,88] d={}.fromkeys(my_list) print(d.keys())

deffunction(lefdict,rightdict,choice): samelist=lefdict.keys() &rightdict.keys() # dict.keys()返回的是一个可迭代对象，取两个dict的keys的交集diflist=lefdict.keys() ^rightdict.keys() # 取两个dict的keys的不同集newdict={} forkey,valueinlefdict.items(): ifkeyindiflist: newdict[key]=valueelifkeyinsamelist: ifvalue==choice: newdict[key]=valueforkey,valueinrightdict.items(): ifkeyindiflist: newdict[key]=valueelifkeyinsamelist: ifvalue==choice: newdict[key]=valueprint(samelist,diflist) print(newdict) returnnewdictfunction({1:'a',2:'b',3:'c'},{4:'f',2:'b',3:'d'},'b')

deffunction(str1, str2): str1=str1[-1] +str1[:-1] print(str1) ifstr1.find(str2) !=-1: returnTrueelse: returnFalseprint(function("abcde", "cde"))

classA(object): defrun(self): print("基础 run 方法") classB(A): defrun(self): print("衍生 run 方法 ") obj=B() obj.run()

classA(object): defrun(self): print("基础 run 方法") classB(A): defrun(self): print("衍生 run 方法 ") obj=B() obj.__class__=Aobj.run()

classA(object): def__init__(self,a,b): self.__a=aself.__b=bdefshow(self): print("a=",self.__a,"b=",self.__b) a=A(5,10) a.show() a(20) 

classA(object): def__init__(self,a,b): self.__a=aself.__b=bdefshow(self): print("a=",self.__a,"b=",self.__b) def__call__(self, num): print("call:",num+self.__a) a=A(5,10) a.show() a(20)

classA(object): def__init__(self,a,b): self.a1=aself.b1=bprint("初始化方法") defmyfunc(self): print("myfunc") a1=A(10,20) a1.fn1() a1.fn2() a1.fn3()

classA(object): def__init__(self,a,b): self.a1=aself.b1=bprint("初始化方法") defmyfunc(self): print("myfunc") def__getattr__(self, item): returnself.myfunca1=A(10,20) a1.fn1() a1.fn2() a1.fn3()

defget_lines(): # 生成器withopen('big.data', 'r') asf: whileTrue: data=f.readlines(100) ifdata: yielddataelse: breakf=get_lines() # 迭代器对象print(next(f)) print(next(f)) print(next(f)) 复制代码

year=int(input('请输入4位数字的年份：')) #获取年份month=int(input('请输入月份：')) #获取月份day=int(input('请输入是哪一天：')) #获取日ifmonth==1: count=dayelifmonth==2: count=31+dayelif (month>=3) and ((year%4==0andyear%100!=0) oryear%400==0): ifmonth==3: count=31+29+dayifmonth==4: count=31+29+31+dayifmonth==5: count=31+29+31+30+dayifmonth==6: count=31+29+31+30+31+dayifmonth==7: count=31+29+31+30+31+30+dayifmonth==8: count=31+29+31+30+31+30+31+dayifmonth==9: count=31+29+31+30+31+30+31+31+dayifmonth==10: count=31+29+31+30+31+30+31+31+30+dayifmonth==11: count=31+29+31+30+31+30+31+31+30+31+dayifmonth==12: count=31+29+31+30+31+30+31+31+30+31+30+dayelse: ifmonth==3: count=31+28+dayifmonth==4: count=31+28+31+dayifmonth==5: count=31+28+31+30+dayifmonth==6: count=31+28+31+30+31+dayifmonth==7: count=31+28+31+30+31+30+dayifmonth==8: count=31+28+31+30+31+30+31+dayifmonth==9: count=31+28+31+30+31+30+31+31+dayifmonth==10: count=31+28+31+30+31+30+31+31+30+dayifmonth==11: count=31+28+31+30+31+30+31+31+30+31+dayifmonth==12: count=31+28+31+30+31+30+31+31+30+31+30+dayprint('第'+str(count) +'天')

importdatetimey=int(input('请输入4位数字的年份：')) # 获取年份m=int(input('请输入月份：')) # 获取月份d=int(input('请输入是哪一天：')) # 获取“日”targetDay=datetime.date(y, m, d) # 将输入的日期格式化成标准的日期dayCount=targetDay-datetime.date(targetDay.year-1, 12, 31) # 减去上一年最后一天print('%s是%s年的第%s天。'% (targetDay, y, dayCount.days))

importdatetimedtime=input("请输入求天数的日期(20191111)：") tnum=datetime.datetime.strptime(dtime,'%Y%m%d').strftime("%j") print(dtime+"在一年中的天数是: "+tnum+"天。")

list= [1,2,3,4,5] deffn(x): returnx**2res=map(fn,list) res= [iforiinres] print(res) res= [iforiinresifi>10] print(res)

defget_suffix(filename, has_dot=False): """ 获取文件名的后缀名 :param filename: 文件名 :param has_dot: 返回的后缀名是否需要带点 :return: 文件的后缀名 """pos=filename.rfind('.') if0<pos<len(filename) -1: index=posifhas_dotelsepos+1returnfilename[index:] else: return''

deff(*args,**kwargs): print(args, kwargs) l= [1,2,3] t= (4,5,6) d={'a':7,'b':8,'c':9} f() f(1,2,3) # (1, 2, 3){}f(1,2,3,"groovy") # (1, 2, 3, 'groovy'){}f(a=1,b=2,c=3) # (){'a': 1, 'c': 3, 'b': 2}f(a=1,b=2,c=3,zzz="hi") # (){'a': 1, 'c': 3, 'b': 2, 'zzz': 'hi'}f(1,2,3,a=1,b=2,c=3) # (1, 2, 3){'a': 1, 'c': 3, 'b': 2}f(*l,**d) # (1, 2, 3){'a': 7, 'c': 9, 'b': 8}f(*t,**d) # (4, 5, 6){'a': 7, 'c': 9, 'b': 8}f(1,2,*t) # (1, 2, 4, 5, 6){}f(q="winning",**d) # (){'a': 7, 'q': 'winning', 'c': 9, 'b': 8}f(1,2,*t,q="winning",**d) # (1, 2, 4, 5, 6){'a': 7, 'q': 'winning', 'c': 9, 'b': 8}deff2(arg1,arg2,*args,**kwargs): print(arg1,arg2, args, kwargs) f2(1,2,3) # 1 2 (3,){}f2(1,2,3,"groovy") # 1 2 (3, 'groovy'){}f2(arg1=1,arg2=2,c=3) # 1 2 (){'c': 3}f2(arg1=1,arg2=2,c=3,zzz="hi") # 1 2 (){'c': 3, 'zzz': 'hi'}f2(1,2,3,a=1,b=2,c=3) # 1 2 (3,){'a': 1, 'c': 3, 'b': 2}f2(*l,**d) # 1 2 (3,){'a': 7, 'c': 9, 'b': 8}f2(*t,**d) # 4 5 (6,){'a': 7, 'c': 9, 'b': 8}f2(1,2,*t) # 1 2 (4, 5, 6){}f2(1,1,q="winning",**d) # 1 1 (){'a': 7, 'q': 'winning', 'c': 9, 'b': 8}f2(1,2,*t,q="winning",**d) # 1 2 (4, 5, 6){'a': 7, 'q': 'winning', 'c': 9, 'b': 8}

defdigit_count(k,n): listn= [] count=0foriinrange(0,n+1): count+=str(i).count(str(k)) ifstr(k) instr(i): listn.append(str(i)) returncount,listnc,ls=digit_count(1,12) print(c,ls)

A0=dict(zip(('a','b','c','d','e'),(1,2,3,4,5))) A1=range(10) A2= [iforiinA1ifiinA0] A3= [A0[s] forsinA0] A4= [iforiinA1ifiinA3] A5={i:i*iforiinA1} A6= [[i,i*i] foriinA1]

A0={'a': 1, 'c': 3, 'b': 2, 'e': 5, 'd': 4} A1= [0, 1, 2, 3, 4, 5, 6, 7, 8, 9] A2= [] A3= [1, 3, 2, 5, 4] A4= [1, 2, 3, 4, 5] A5={0: 0, 1: 1, 2: 4, 3: 9, 4: 16, 5: 25, 6: 36, 7: 49, 8: 64, 9: 81} A6= [[0, 0], [1, 1], [2, 4], [3, 9], [4, 16], [5, 25], [6, 36], [7, 49], [8, 64], [9, 81]]

list= ['a','a','a',1,2,3,4,5,'A','B','C'] a,b,c,*middle,d,e,f=listprint(middle) print(type(middle))

os.remove('a.txt')

deforder_by(str): returnstr[::-1] print(order_by('123456')) 输出：654321

defreverse2(text='abcdef'): new_text=list(text) new_text.reverse() return''.join(new_text) reverse2('abcdef')

defreverse3(text='abcdef'): new_text=[] foriinrange(1,len(text)+1): new_text.append(text[-i]) return''.join(new_text) reverse3('abcdef')

fromcollectionsimportdequedefreverse4(text='abcdef'): d=deque() d.extendleft(text) return''.join(d) reverse4('abcdef')

defread_in_block(file_path): BLOCK_SIZE=1024withopen(file_path, "r") asf: whileTrue: block=f.read(BLOCK_SIZE) # 每次读取固定长度到内存缓冲区ifblock: yieldblockelse: return# 如果读取到文件末尾，则退出deftest3(): file_path="/tmp/test.log"forblockinread_in_block(file_path): printblock

deftest4(): withopen("/tmp/test.log") asf: forlineinf: printline

>>>mytuple=3,4,5>>>mytuple (3, 4, 5)

>>>x,y,z=mytuple>>>x+y+z

a='aaabbcccdddde'aa=''foriinsorted(list(set(a)),key=a.index): aa=aa+i+str(a.count(i)) print(aa)

wanshu=[] foriinrange(1,1001): s=0forjinrange(1,i//2+1): ifi%j==0: s+=jelse: ifi==s: wanshu.append(i) print(wanshu)

defgetC(s): ifnots: returnlen_s=len(s) ss=[] foriinrange(len_s): combination(s,0,i,ss) aaa=[] defcombination(s,index,num,ss): globalaaaifnum==-1: returnifindex==len(s): returnss.append(s[index]) aaa.append(''.join(ss)) combination(s,index+1,num-1,ss) ss.pop() combination(s,index+1,num,ss) getC('123') print(aaa) print(sorted(set(aaa),key=lambdax:len(str(x))))

defsolution(s): ll=len(s) foriinrange(1,ll//2+1): ifll%i==0: j=0whiles[:i]==s[j:j+i] andj<ll: j=j+iifj==ll: returnTruereturnFalseprint(solution('abababa'))

s=[1,2,3,5,6,8,9,10,25,12,30] # 筛选出3的倍数# 第一个参数为一个返回True或者False的函数，第二个参数为可迭代对象# 该函数把可迭代对象依次传入第一个函数，如果为True，则筛选d=filter(lambdax:Trueifx%3==0elseFalse,s) print(list(d))

# 第一个参数为函数，依次将后面的参数传给第一个函数，并执行函数# 如果有多个参数则，依次将后面的对应传给参数s=map(lambdax,y:x+y,range(10),range(10)) print(list(s)) ss=map(lambdax:x*x,range(10)) print(list(ss))

fromfunctoolsimportreduce# 开始的时候将可迭代对象的第一个数和第二个数当成x和y# 然后将第一次函数的执行结果当成x，然后再传入一个数当成y# 再执行函数s=reduce(lambdax,y:x+y,range(101)) print(s) # 相当于0+1+2+……+99+100

deffib2(imax): t,a,b=0,0,1whilet<imax: yieldba,b=b,a+bt+=1foriinfib2(10): print(i)

alist=[1,22,2,33,23,32] ss=[x[1] forxinfilter(lambdax:x[0]%2==1,enumerate(alist))] print(ss)

importstringprint(string.ascii_lowercase) # 小写字母print(string.ascii_uppercase) # 大写字母print(string.digits) # 0-9s=string.digits+string.ascii_uppercase+string.ascii_lowercasedef_10_to_62(num): ss=''whileTrue: ss=s[num%62]+ssifnum//62==0: breaknum=num//62returnssprint(_10_to_62(65))

importtimefromfunctoolsimportwrapsdefdec(func): key=func.__name__cache={key:None} @wraps(func)definner(*args,**kwargs): result=Noneifcache.get(key) isNone: cache[key]=time.time() result=func(*args,**kwargs) print('执行函数中') else: now=time.time() ifnow-cache[key]>10: cache[key]=nowresult=func(*args,**kwargs) print('执行函数中') else: print('函数执行受限') returnresultreturninner@decdefadd(x,y): print(x+y) add(1,2) add(1,3) time.sleep(10) add(3,4)

fromfunctoolsimportwrapsdefdec(func): @wraps(func)definner(*args,**kwargs): result=[func(*args,**kwargs) foriinrange(5)] returnresultreturninner@decdefadd(x,y): returnx+yprint(add(1,2))

deffunc(lis): lis1=[] del_lis=[] foriinlis: ifinotinlis1: ifinotindel_lis: lis1.append(i) else: del_lis.append(i) lis1.remove(i) returnsum(lis1) deffunc2(lis): returnsum([iforiinset(lis) iflis.count(i)==1]) print(func2([3,4,1,2,5,6,6,5,4,3,3]))

importosdefget_files(dir,suffix): res= [] forroot,dirs,filesinos.walk(dir): forfilenameinfiles: name,suf=os.path.splitext(filename) ifsuf==suffix: res.append(os.path.join(root,filename)) print(res) get_files("./",'.pyc')

importosdefpick(obj): ifobj.endswith(".pyc"): print(obj) defscan_path(ph): file_list=os.listdir(ph) forobjinfile_list: ifos.path.isfile(obj): pick(obj) elifos.path.isdir(obj): scan_path(obj) if__name__=='__main__': path=input('输入目录') scan_path(path)

fromglobimportiglobdeffunc(fp, postfix): foriiniglob(f"{fp}/**/*{postfix}", recursive=True): print(i) if__name__=="__main__": postfix=".pyc"func("K:\Python_script", postfix)

defatoi(s): num=0forvins: forjinrange(10): ifv==str(j): num=num*10+jreturnnum

defatoi(s): num=0forvins: num=num*10+ord(v) -ord('0') returnnum

defatoi(s): num=0forvins: t="%s * 1"%vn=eval(t) num=num*10+nreturnnum

fromfunctoolsimportreducedefatoi(s): returnreduce(lambdanum, v: num*10+ord(v) -ord('0'), s, 0)

defdistFunc1(a): """使用集合去重"""a=list(set(a)) print(a) defdistFunc2(a): """将一个列表的数据取出放到另一个列表中，中间作判断"""list= [] foriina: ifinotinlist: list.append(i) #如果需要排序的话用sortlist.sort() print(list) defdistFunc3(a): """使用字典"""b={} b=b.fromkeys(a) c=list(b.keys()) print(c) if__name__=="__main__": a= [1,2,4,2,4,5,7,10,5,5,7,8,9,0,3] distFunc1(a) distFunc2(a) distFunc3(a) 

importre# 方法一deftest(filepath): distone={} withopen(filepath) asf: forlineinf: line=re.sub("\W+", " ", line) lineone=line.split() forkeyoneinlineone: ifnotdistone.get(keyone): distone[keyone] =1else: distone[keyone] +=1num_ten=sorted(distone.items(), key=lambdax:x[1], reverse=True)[:10] num_ten=[x[0] forxinnum_ten] returnnum_ten# 方法二 # 使用 built-in 的 Counter 里面的 most_commonimportrefromcollectionsimportCounterdeftest2(filepath): withopen(filepath) asf: returnlist(map(lambdac: c[0], Counter(re.sub("\W+", " ", f.read()).split()).most_common(10)))