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  • In python, changing MySQL query based on function variables

    - by ensnare
    I'd like to be able to add a restriction to the query if user_id != None ... for example: "AND user_id = 5" but I am not sure how to add this into the below function? Thank you. def get(id, user_id=None): query = """SELECT * FROM USERS WHERE text LIKE %s AND id = %s """ values = (search_text, id) results = DB.get(query, values) This way I can call: get(5) get(5,103524234) (contains user_id restriction)

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  • Decimal Base Conversion using PYTHON

    - by Butinyane More
    PROBLEM DESCRIPTION Given a decimal number, and a new base to represent it in. If the base is larger than 10, use capital letters for the digits(that is, A is 10, B is 11 and so forth). The decimal number given, and the new base, will both be integer values, separated by a space. The base to convert to will always be smaller than or equal to 30. Please create a program that will convert a decimal number to any base in this instance. When evaluating the program the sample input must something like: 18 2 and the program must output the following: 10010 Please i beg of you to send me a solution to this problem as soon as possible.

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  • Python enumerate built-in error when using the start parameter

    - by TheJuice
    I'm modifying some code that calls enumerate on a list declared via a list comprehension e.g. self.groups = [Groups(self, idx) for idx in range(n_groups)] then later: for idx, group in enumerate(self.groups): # do some stuff but when I change the enumerate call to start at the 2nd list element via the start parameter e.g. for idx, group in enumerate(self.groups[1]): I get an exception: exceptions.TypeError: 'Group' object is not iterable Could someone explain why this is?

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  • Python turtle module confusion

    - by John
    Hi, I'm trying to to add more lines to the triangle, so instead of 3 leading off there will be 5 depending on the parameter given but I really have no idea what to do at this stage and any help would be very welcome. Thanks in advance!:) def draw_sierpinski_triangle(tracer_on, colour, initial_modulus, line_width, initial_heading,initial_x, initial_y, steps): turtle=Turtle() turtle.name = 'Mother of all turtles' turtle.reset () turtle.tracer (tracer_on) turtle.speed ('fastest') turtle.color (colour) turtle.width (line_width) turtle.up() turtle.goto (initial_x, initial_y) turtle.down() turtle.set_heading (initial_heading) draw_sub_pattern (tracer_on, turtle, initial_modulus, 0, steps) def draw_sub_pattern (tracer_on, turtle, modulus, depth, steps): if (depth >= steps): return; x, y = turtle.position () heading = turtle.heading () # draw the pattern turtle.up() turtle.down() turtle.forward (modulus) draw_sub_pattern(tracer_on, turtle, modulus * 0.5, depth + 1, steps) turtle.up() turtle.goto(x, y) turtle.down() turtle.set_heading (heading + 120) turtle.forward (modulus) draw_sub_pattern(tracer_on, turtle, modulus * 0.5, depth + 1, steps) turtle.up() turtle.goto(x, y) turtle.down() turtle.set_heading (heading + 240) turtle.forward (modulus) draw_sub_pattern(tracer_on, turtle, modulus * 0.5, depth + 1, steps)

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  • draw circle PIL - python

    - by ariel
    Hi I am looking for a command that will draw a circle on an existing image. im=Image.open(path) looking for a function that will draw a coloured circle with radious r and center(x,y) thanks for any help provided Ariel

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  • Python utf-8 decoding issue with hashlib.digest() method

    - by Sorw
    Hello StackOverflow community, Using Google App Engine, I wrote a keyToSha256() method within a model class (extending db.Model) : class Car(db.Model): def keyToSha256(self): keyhash = hashlib.sha256(str(self.key())).digest() return keyhash When displaying the output (ultimately within a Django template), I get garbled text, for example : ?????_??!`?I?!?;?QeqN??Al?'2 I was expecting something more in line with this : 9f86d081884c7d659a2feaa0c55ad015a3bf4f1b2b0b822cd15d6c15b0f00a08 Am I missing something important ? Despite reading several guides on ASCII, Unicode, utf-8 and the like, I think I'm still far from mastering the secrets of string encoding/decoding. After browsing StackOverflow and searching for insights via Google, I figured out I should ask the question here. Any idea ? Thanks !

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  • python lists error

    - by mekasperasky
    #defining the magic constants p=0xb7e15163 q=0x9e3779b9 pt=list() pt1=list() ct=list() pt2=list() #pt[0]=0pt1[0]=ct[0]=pt1[1]=ct[1]=0 s=[] l=[] b=8 key=[0,0,0,0,0,0,0,0,0] w=8 t=16 def enc(c,d): for i in range(1,r): A=A+s[0] B=B+s[1] A=A^B A=str(A) B=str(B) A=A[len(B):]+A[:len(B)] B=B^A A=str(A) B=str(B) B=B[len(A):]+B[:len(B)] A=A+s[2*i] B=B+s[2*i+1] ct.append(A) ct.append(B) def denc(): for i in range(r,1): A=ct[0] B=ct[1] B=B-s[2*i+1] B=B[len(c):] + B[:len(c)] B=B^A A=A-s[2*i] A=A[:len(B)]+c[len(B):] A=A^B pt1[1]=B-S[1] pt1[0]=A-S[0] def setup(k): u=w/8 for i in range(b-1,0): l.append(l[i/u:8]+l[8:i/u]+k[i]) s.append(p) for i in range(1,t-1): s.append(s[i-1] + q) i=j=0 A=B=0 for i in range(0,3*t): A=s.append(s[i]+A+B) B=s.append(s[:3]+s[3:]) #B=l.append((l[j]+A+B)) ll=len(str(A))+len(str(B)) B=l.append(l[:ll]+l[ll:]) i=(i+1)%t j=(j+1)%t def pri(g): for k in range(0,w): print g & 0xFF #for i in range(0,b): #key[i]=ct[0]%(255-j) pt1=[raw_input()] pt1=[raw_input()] setup(key) enc(pt1,ct) denc(ct,pt2) print("key") print(key) print("plaintext") printword(pt1[0]),printword(pt1[1]) printword(ct[0]),printword(ct[1]) the list l is always going out of index though it should not . I am not able to take the length of the string A even though it is a string .Once i convert it to string i am not able to add it in s[j]+A+B. How to get around such errors and make the code more hygenic .. This is an rc5 cipher.

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  • Multiple range product in Python

    - by Tyr
    Is there a better way to do this: perms = product(range(1,7),range(1,7),range(1,7)) so that I can choose how many ranges I use? I want it to be equivalent to this, but scalable. def dice(num) if num == 1: perms = ((i,) for i in range(1,7)) elif num == 2: perms = product(range(1,7),range(1,7)) elif num == 3: perms = product(range(1,7),range(1,7),range(1,7)) #... and so on but I know there has to be a better way. I'm using it for counting dice outcomes. The actual code def dice(selection= lambda d: d[2]): perms = itertools.product(range(1,7),range(1,7),range(1,7)) return collections.Counter(((selection(sorted(i)) for i in perms))) where I can call it with a variety of selectors, like sum(d[0:2]) for the sum of the lowest 2 dice or d[1] to get the middle dice.

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  • Beginner python - stuck in a loop

    - by Jeremy
    I have two begininer programs, both using the 'while' function, one works correctly, and the other gets me stuck in a loop. The first program is this; num=54 bob = True print('The guess a number Game!') while bob == True: guess = int(input('What is your guess? ')) if guess==num: print('wow! You\'re awesome!') print('but don\'t worry, you still suck') bob = False elif guess>num: print('try a lower number') else: print('close, but too low') print('game over')`` and it gives the predictable output of; The guess a number Game! What is your guess? 12 close, but too low What is your guess? 56 try a lower number What is your guess? 54 wow! You're awesome! but don't worry, you still suck game over However, I also have this program, which doesn't work; #define vars a = int(input('Please insert a number: ')) b = int(input('Please insert a second number: ')) #try a function def func_tim(a,b): bob = True while bob == True: if a == b: print('nice and equal') bob = False elif b > a: print('b is picking on a!') else: print('a is picking on b!') #call a function func_tim(a,b) Which outputs; Please insert a number: 12 Please insert a second number: 14 b is picking on a! b is picking on a! b is picking on a! ...(repeat in a loop).... Can someone please let me know why these programs are different? Thank you!

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  • Python slicing a string using space characters and a maximum length

    - by chrism
    I'd like to slice a string up in a similar way to .split() (so resulting in a list) but in a more intelligent way: I'd like it to split it into chunks that are up to 15 characters, but are not split mid word so: string = 'A string with words' [splitting process takes place] list = ('A string with','words') The string in this example is split between 'with' and 'words' because that's the last place you can split it and the first bit be 15 characters or less.

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  • Python date time, get date 6 months from now

    - by Eef
    Hey, I am using the datetime module. I am looking to calculate the date 6 months from the current date. Could someone give me a little help doing this? Edit: The reason I am wanting to generate a date 6 months from the current date is to produce a Review Date. If the user enters data into the system it will have a review date of 6 months from the date they entered the data. Does this help? Cheers Eef

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  • Iterating through String word at a time in Python

    - by AlgoMan
    I have a string buffer of a huge text file. I have to search a given words/phrases in the string buffer. Whats the efficient way to do it ? I tried using re module matches. But As i have a huge text corpus that i have to search through. This is taking large amount of time. Given a Dictionary of words and Phrases. I iterate through the each file, read that into string , search all the words and phrases in the dictionary and increment the count in the dictionary if the keys are found. One small optimization that we thought was to sort the dictionary of phrases/words with the max number of words to lowest. And then compare each word start position from the string buffer and compare the list of words. If one phrase is found, we don search for the other phrases (as it matched the longest phrase ,which is what we want) Can some one suggest how to go about word by word in the string buffer. (Iterate string buffer word by word) ? Also, Is there any other optimization that can be done on this ?

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  • Python regex help

    - by Dormish
    I am trying to make a regex that finds all names, url and phone numbers in an html page. But I'm having trouble with the phone number part. I think the problem with the numbers part is that is searches until it finds the </strong> but in that process it skips people, instead of making a empty string if the person has no phone number ( simply put instead of a list like this: url1+name1+num1 | url2+name2+"" | url3+name3+num3 it returns a list like this: url1+name1+num1 | url2+name2+num3 , with url3+name3 deleted in the process) for url, name, pnumber in re.findall('Name"><div>(?:<a href="/si([^">]*)"> )?([^<]*)(?:.*?</strong>([^<]*))?',page): I am searchin for people in s single very long line. A person could have an url or phone number. An example of a person with an url and a phone number <tr> <td class="lablinksName"><div><a href="/si/ivan-bratko/default.html"> dr. Ivan Bratko akad. prof.</a></div></td> <td class="lablinksMail"><a href="javascript:void(cmPopup('sendMessage', '/si/ivan-bratko/mailer.html', true, 350, 350));"><img src="/Static/images/gui/mail.gif" height="8" width="11"></a></td> <td class="lablinksPhone"><div><strong>T:</strong> +386 1 4768 393 </div></td> </tr> And an example of a person with no url or phone number <tr> <td class="lablinksName"><div> dr. Branko Matjaž Juric prof.</div></td> <td class="lablinksMail"><a href="javascript:void(cmPopup('sendMessage', '/si/branko-matjaz-juric/mailer.html', true, 350, 350));"><img src="/Static/images/gui/mail.gif" height="8" width="11"></a></td> <td class="lablinksPhone"><div> </div></td> </tr> I hope i was clear enough and if any one can help me.

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  • finding the missing values in a range using any scripting language - perl, python or shell script

    - by manu
    Hi everyone I got stuck in one problem of finding the missing values in a range and the range is also variable for the successive rows. Ex. =================== inpt ==================== 673 673 673 676 676 680 2667 2667 2668 2670 2671 2674 ===================== output should be like this =================== 674 675 677 678 679 2669 2672 2673 ======================== This is just one part and the row values can be more also If there is any clarification plz let me know. thanx in advance manu

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  • global variable and Python

    - by rejinacm
    A global variable created in one function cannot be used in another function directly. Instead I need to store the global variable in a local variable of the function which needs its access. Am I correct? Why is it so?

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  • Can someone here explain constructors and destructors in python - simple explanation required - new

    - by rgolwalkar
    i will try to see if it makes sense :- class Person: '''Represnts a person ''' population = 0 def __init__(self,name): //some statements and population += 1 def __del__(self): //some statements and population -= 1 def sayHi(self): '''grettings from person''' print 'Hi My name is %s' % self.name def howMany(self): '''Prints the current population''' if Person.population == 1: print 'i am the only one here' else: print 'There are still %d guyz left ' % Person.population rohan = Person('Rohan') rohan.sayHi() rohan.howMany() sanju = Person('Sanjivi') sanju.howMany() del rohan # am i doing this correctly --- ? i need to get an explanation for this del - destructor O/P:- Initializing person data ****************************************** Initializing Rohan ****************************************** Population now is: 1 Hi My name is Rohan i am the only one here Initializing person data ****************************************** Initializing Sanjivi ****************************************** Population now is: 2 In case Person dies: ****************************************** Sanjivi Bye Bye world there are still 1 people left i am the only one here In case Person dies: ****************************************** Rohan Bye Bye world i am the last person on earth Population now is: 0 If required i can paste the whole lesson as well --- learning from :- http://www.ibiblio.org/swaroopch/byteofpython/read/

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  • Python optimization

    - by Rami Jarrar
    Hi, I do like this: f = open('wl4.txt', 'w') hh = 0 ###################################### for n in range(1,5): for l in range(33,127): if n==1: b = chr(l) + '\n' f.write(b) hh += 1 elif n==2: for s0 in range(33, 127): b = chr(l) + chr(s0) + '\n' f.write(b) hh += 1 elif n==3: for s0 in range(33, 127): for s1 in range(33, 127): b = chr(l) + chr(s0) + chr(s1) + '\n' f.write(b) hh += 1 elif n==4: for s0 in range(33, 127): for s1 in range(33, 127): for s2 in range(33,127): b = chr(l) + chr(s0) + chr(s1) + chr(s2) + '\n' f.write(b) hh += 1 ###################################### print "We Made %d Words." %(hh) ###################################### f.close() So, is there any method to make it faster?

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