python barcode generator

Small Q: The atrium of the white tree-dwelling crow, cold dew silent wet osmanthus; Tonight the Ming Dynasty, I do not know the autumn think of who home? Wang Jian "The Moon in the Night"Two password generation code instances=============================================================#!/usr/bin/python#-*-Coding:utf8-*-from Random import randrange, samplepassword_list = [' Z ', ' y ', ' x ', ' w ', ' V ', ' u ', ' t ', ' s ', ' r ', ' Q ', ' P ', ' O

The Fibonacci sequence can be generated in a good way with generators, directly on the code:# 1 Control Maximum digital versiondef fib (max): x, y = 0,1while y 　　# 2 Control Iteration count version def fib (count): X,y,n = 0,1,1while N 　　"The beauty of simplicity" Fibonacci that tangent series generator python

def consummer (name):While True:Baozi = yieldPrint (' Bun%s ' came, was eaten by%s '% (baozi,name))Return Nonec = Consummer (' Purple star adult ')BZ = ' leek stuffing 'C.send (BZ) #唤醒yield并传值c.__next__ () #只唤醒不传值Simulate parallel effects under single thread # It should actually be the Ctrip effect, a unit smaller than the processImport timedef consummer (name):Print (' customer%s already ready to eat buns '%name ')While True:Baozi = yieldPrint (' Bun%s ' came, was eaten by%s '% (baozi,name))Def

List-expressionProgram One:General wording:Egg_list=[]for i in range: egg_list.append (' egg%s '%i) print (egg_list)List expression type:l=[' egg%s '%i for I in range (+) If I > 0]print (L)Program Two:General wording:l=[1,2,3,4]s= ' hello ' l1=[]for num in L: For S1 in S: t= (NUM,S1) l1.append (t) print (L1)List expression type:l1=[(NUM,S1) for NUM in L if num > 2 for S1 in S]print (L1)Program Three:General wording:Import osg=os.walk (' f:\\xuyaping ') file_path_list=[]for i

(): Creating a directory treeAccess rights-relatedAccess (): Verify the permission mode for a user or group of userschmod (): Modify PermissionsChown (): Modify the owner and the genus GroupUmask (): Set default permission ModeFile Descriptor:Open (): open () of the underlying operating systemRead ():Write ():Device files:Makedev ():Major (): Get the main device numberMinor (): Gets the secondary device numberPath Management:Import Os.pathbasename (): Path base NameDirName (): Path directory Na

For example, the Fibonacci sequence: 1,1,2,3,5,8,13,21,34 .... It can't be written with a list generation, but we can print it out using a function: Def fib (number): N, a, b = 0, 0, 1 while n The python generator implements the Fibonacci sequence

( ) Print (x.__next__ ()) print (x.__next__ ()) # known list L has 5 values, # is an exception when you take the 6th value stopiterationOutput Result:1Traceback (most recent):2 "c:/users/william/pycharmprojects/python_ item2/study/day9/iterator. Py" in print(x.__next__()) # known list L has 5 values,5stopiterationView CodeExample 2: Using Isinstance to determine whether a Python common data type is an iterator objectFrom collec

Example 1:Requirement: Cycle 0-10, add each value together to print　　# Literary Youth Edition n = list (range) for index, I in Enumerate (n): n[i] + = 1print (n) [1, 2, 3, 4, 5, 6, 7, 8, 9, ten] # Execute Result # forced Youth n = list (range) print (list (map (lambda x:x+1, N)) [1, 2, 3, 4, 5, 6, 7, 8, 9, ten] # execution Result # more Forced Youth Edition (list-generated) n = [I+1 for I in Range]]print (n) [1, 2, 3, 4, 5, 6, 7, 8, 9, ten] # Execution results　　List generation function i

1. Recursive function1.1. Limitations of Recursive functions(1) Recursive must have exit conditions, and recursive call must be executed to this exit condition, if there is no exit condition, is infinite call, will exhaust all resources (stack space);(2) The depth of recursive calls is not too deep, Python limits the depth of recursive calls to protect the interpreter;1.2. Recursive instances①, recursive implementation of the thin-cut sequence#Version

This article mainly describes the python in the iterator and the builder instance of the relevant information, the need for friends can refer to the following An explanation of iterators and builder instances in Python This paper summarizes some of the relevant knowledge of iterators and generators in Python by means of different application scenarios and their

memory usageThe original way of the same effect is to invoke the ReadLines method of the file with a for loop, which is the list of loaded files into memory, made into a line string.Although the two effects are the same, the latter is to load the file into memory one time, and if the file is too large, the computer does not have enough memory space to even work. The former iterator version, for this problem has immune function. (Python3 by overriding I/O to support Unicode text so that this is

Sphinx introducation: Python documentation Generator Author: Chao Zhong (zhongchao) Email: zhongchao. USTC # gmail.com (#-> @) Blog: blog.csdn.net/poechant Date: SEP 30,201 2 0 install sphinx easy_install -U Sphinx1 build project1.1 sphinx-Quickstart michael@ubuntu:~/release/sphinx$ sphinx-quickstart Welcome to the Sphinx 1.1.3 quickstart utility.Please enter values for the following settings (just p

02, iterator Objects that can be iterated:Internal containing __iter__ follows an iterative protocol# Print (dir (' 123 ')) # ' __iter__ '# print (' __iter__ ' in Dir ([1, 2, 3])# Print (' __iter__ ' in dir ({' name ': ' Alex '})# print (' __iter__ ' in dir ({' name '})#) # Print (' __iter__ ' in Dir ((1, 2, 3))# print (' __iter__ ' in Dir (1)) # False# c15> print (' __iter__ ' in Dir (True)) # False iterator: An iterative object. __iter__ () can be converted to an iterator that sati

The first section decorator Review and Knowledge reserve------------The first section of the decorator Review and Knowledge reserve------------def wrapper (*args,**kwargs): index (*ARGS,**KWARGS) # * is the role of breaking the positional parameters to the value of args=[a,b,c]# * * The function is to break the keyword parameters to Kwargs=[a,b,c]def index (A,B,C): print (a,b,c) wrapper (' TT ', ' pppp ', c= ' VVV ') Two: Functions can be passed as data. A function can pass as a parameter

-1: + yieldP - Else: + forResultinchQueens (num, state+[P]): A yield[result, p] at - - def play3 (l): - """ - to crack a sub-list in the returned results list - """ in Try: - Try: L +"' to except Typeerror:pass + Else: Raise TypeError - forIinchL: the forSinchPlay3 (i): * yields $ except TypeError:Panax Notoginseng yieldL - the def printqueens (l): + "

RequirementsWrite a program that can automatically generate small poems.The format is as followsSource CodeImport Randomimport sysarticles = ["The", "a", "another", "her", "he"]subjects = ["Cat", "dog", "horse", "Man", "Woman", "Boy", "girl"]verbs = ["sang", "ran", "jumped", "said", "fought", "swam", "saw", "heard", "Felt", "slept", "hopped", "hoped", "cried", "laughed", "walked"]adverbs = ["loudly", "Q Uietly "," quickly "," slowly "," well "," badly ", " rudely "," politely "]line

1 #/bin/python32 ImportSYS3 Import Time4 ImportRandom5STRs = [i forIinchRange (32,128)] #产生密码的ASCII码的序列6Length =10 #生成密码长度7#下面这个函数用来生成Length长度的密码8 defrandomstr (strs,length):9Liststr = []Ten forIinchRange (length): One liststr.append (Random.choice (STRs)) A returnListstr - defstrings (): -String ="" thechar =randomstr (strs,length) - forIinchChar: -string+=chr (i) - returnstring +#上面这个函数将调用randomstr函数, returns a string password - +Start =Time.time ACount =1

The embryonic form of asynchronous IO:Simple single-threaded parallel effectImport timedef Consumer (name): print ("%s ready to eat buns!") "%name) while True: baozi = yield print (" Bun [%s] came, eaten by [%s]! " "% (baozi,name)) C = Consumer (" Chenronghua ") c.__next__ () #调用只唤醒 yield# b1=" Leek Stuffing "# # C.send (B1) #调用yield并传值 #c.__next__ () def producer (name): C = Consumer (' A ') c2 = consumer (' B ') c.__next__ () c2.__next__ () print (" Lao Tzu

#!/usr/bin/env pythonimport randomimport stringimport syssimilar_char = ' 0ooii1lpp ' upper = '. Join (Set ( String.uppercase)-Set (Similar_char)) lower = ". Join (Set (String.lowercase)-Set (Similar_char)) symbols = '!#$%\* +,-./:; [Email protected]^_ ' ~ ' numbers = ' 123456789 ' group = (upper, lower, symbols, numbers) def getpass (lenth=8):p w = [Random.choi CE (i) for i in Group]con = ". Join (group) for I in range (Lenth-len (PW)):p w.append (Random.choice (Con)) random.shuffle (PW) Return