Compare 2 csv files and output different rows to a 3rd CSV file using Python 2.7
You're currently checking for rows that exist in the old file but aren't in the new file. That's not what you want to do. Instead, you should check for rows that exist in the the new file, but aren't in the new one: output = [row for row in newList2...
monosubstitution cypher : decryption in python 2.7 list trouble
There are two problems that I have noticed: In encrypt function: elif char == 'U': encrypted_message.append(key[20]) elif char == 'U': encrypted_message.append(key[21]) Change it to: elif char == 'U': encrypted_message.append(key[20]) elif char == 'V': encrypted_message.append(key[21]) In decrypt function: Doing decrypted_message = decrypted_message.replace(key[i], alphabet[i]) for i in range(0,25), this might replace the...
Concatenation of strings array issues in Python: Str(ArrayOfString[1])+“ ”+Str(ArrayOfString[2]) doesn't seem to work
string,python-2.7,concatenation,slice,string-length
Just change your first attempt to following: if len(str(row[1])) >= 16: row[2] = str(row[1])+" "+str(row[2]) row[1] = str(row[1][0:16]) My answer is freely adapted from comment by @phylogenesis. Update: The above answer wont work because row is a tuple and hence it is immutable. You will need to assign the values...
What is the difference between <> and == in python?
The operator "<>" means 'not equal to', and the operator "==" means 'equal to'. The former evaluates to true if two things being compared are not equal, and the latter evaluates to true if two things being compared are equal. http://www.tutorialspoint.com/python/comparison_operators_example.htm...
Need workaround to treat float values as tuples when updating “list” of float values
python-2.7,matplotlib,computer-science,floating-point-conversion
You can't append to a tuple at all (tuples are immutable), and extending to a list with + requires another list. Make curveList a list by declaring it with: curveList = [] and use: curveList.append(curve) to add an element to the end of it. Or (less good because of the...
How to print words from a word list that have 5 letters or less Python 2.7?
WORDS = txt.splitlines() WORDS_5_or_less = list(filter(lambda x: len(x) <= 5, WORDS)) then just pick from WORDS_5_or_less instead of WORDS...
Count function counting only last line of my list
I don't know what you are exactly trying to achieve but if you are trying to count R and K in the string there are more elegant ways to achieve it. But for your reference I had modified your code. N = int(raw_input()) s = [] for i in range(N):...
python - how to properly evaluate a value from a system command
You need to use subprocess.check_output: mycat = int(subprocess.check_output(cmd, shell=True)) ...
Scrapy running from python script processes only start url
When you override the default parse_start_url for a crawl spider, the method has to yield Requests for the spider to follow, otherwise it can't go anywhere. You are not required to implement this method when subclassing CrawlSpider, and from the rest of your code, it looks like you really don't...
How can I resolve my variable's unexpected output?
Remove the comma on your first line of code, this turns it into a tuple optional_message = form.cleaned_data['optional_message'], should be optional_message = form.cleaned_data['optional_message'] ...
Problems with tk entry and optionmenu widget in currency converter
My answer didn't satisfy me so I solved your problem. Changes: Added self keyword to currAmount1, currAmount2, and reflected this change everywhere in the script. (currAmount1 -> self.currAmount1) Called .get() on the Tkinter variables at the start of curr_search(): cur1 = self.curr_start1.get() cur2 = self.curr_start2.get() amount = self.currAmount1.get() Instead of...
Python: Non repeating random values from list [duplicate]
python,string,python-2.7,random
you can use random.sample() random.sample(population, k) Return a k length list of unique elements chosen from the population sequence. Used for random sampling without replacement. In [13]: "+".join(random.sample(sentences,3)) Out[13]: 'a+b+c' ...
random.randint not generating random values
You seem to be confused between defining a function and calling it and how parameters work. def blackjack(A,B): print "Welcome to Blackjack!" print "Your cards are",name[A-1],"&",name[B-1] total = value[A-1] + value[B-1] print "Your card total is",total In your function A and B are place holders. They will be replaced by...
I need to make sure that only certain characters are in a list?
python,regex,string,list,python-2.7
With such a small range you could just iterate the move_order and check if each element exists in the allowed moves def start(): move_order=[c for c in raw_input("Enter your moves: ")] moves = ['A','D','S','C','H'] for c in move_order: if c not in moves: print "That's not a proper move!" return...
Scrapy Memory Error (too many requests) Python 2.7
python,django,python-2.7,memory,scrapy
You can process your urls by batch by only queueing up a few at time every time the spider idles. This avoids having a lot of requests queued up in memory. The example below only reads the next batch of urls from your database/file and queues them as requests only...
SSLV3_ALERT_HANDSHAKE_FAILURE with SNI using Tornado 4.2 in Python 2.9.10
python,python-2.7,ssl,tornado,sni
It is very hard to tell without having ore information about the server, but I'll try: OpenSSL 0.9.8zd 8 Jan 2015 context = ssl.SSLContext(ssl.PROTOCOL_TLSv1) You are restricting the protocol to TLS 1.0. It might be that the server expects TLS 1.2 or TLS 1.1 or SSL 3.0. Note that TLS...
Datastructure choice issue
python,list,python-2.7,data-structures,tuples
Sounds like you're describing a dictionary (dict) # Creating a dict >>> d = {'Date': "12.6.15", 'FilePath': "C:\somewhere\only\we\know"} # Accessing a value based on a key >>> d['Date'] '12.6.15' # Changing the value associated with that key >>> d['Date'] = '12.15.15' # Displaying the representation of the updated dict >>>...
Python: Terminate subprocess = Success, but it's still running (?)
Two processes are created because you call Popen with shell=True. It looks like the only reason you need to use a shell is so you make use of the file association with the interpreter. To resolve your issue you could also try: from subprocess Popen, PIPE, STDOUT pyTivoPath = "c:\pyTivo\pyTivo.py"...
Parsing Google Custom Search API for Elasticsearch Documents
json,python-2.7,elasticsearch,google-search-api
here is a possible answer to your problem. def myfunk( inHole, outHole): for keys in inHole.keys(): is_list = isinstance(inHole[keys],list); is_dict = isinstance(inHole[keys],dict); if is_list: element = inHole[keys]; new_element = {keys:element}; outHole.append(new_element); if is_dict: element = inHole[keys].keys(); new_element = {keys:element}; outHole.append(new_element); myfunk(inHole[keys], outHole); if not(is_list or is_dict): new_element = {keys:inHole[keys]}; outHole.append(new_element);...
summing string and integers in list in python
You need: total = value[c1-1]+value[c2-1] ...
Python: matplotlib - probability mass function as histogram
python,python-2.7,matplotlib,plot,histogram
As far as I know, matplotlib does not have this function built-in. However, it is easy enough to replicate import numpy as np heights,bins = np.histogram(data,bins=50) heights = heights/sum(heights) plt.bar(bins[:-1],heights,width=(max(bins) - min(bins))/len(bins), color="blue", alpha=0.5) Edit: Here is another approach from a similar question: weights = np.ones_like(data)/len(data) plt.hist(data, bins=50, weights=weights, color="blue",...
Benefit of using os.mkdir vs os.system(“mkdir”)
Correctness Think about what happens if your directory name contains spaces: mkdir hello world ...creates two directories, hello and world. And if you just blindly substitute in quotes, that won't work if your filename contains that quoting type: 'mkdir "' + somedir + '"' ...does very little good when somedir...
Why am I getting a (NameError: name 'self' is not defined ) here using Kivy for Python?
python,python-2.7,kivy,self,nameerror
You've mixed tabs and spaces: When you do that, Python gets confused about how things are supposed to be indented, because it doesn't interpret tabs the same way your editor does. Don't mix tabs and spaces; stick to one or the other, and turn on "show whitespace" in your editor...
python class factory inherit random parent
python,python-2.7,inheritance,factory
In my original answer (which I deleted because it was just plain wrong) I said I would consider doing it like this: class RandomPerson(Person): def __init__(self): rand_person = random.choice((John, Kyle))() self.__dict__ = rand_person.__dict__ This way is an adaptation of the Python Borg idiom; the idea was that everything that matters...
Concatenate a list of series into a uid
python,python-2.7,pandas,py.test
Suppose you want to select columns two and three to add: col_to_add = ['two', 'three'] Use sum(axis=1) to concatenate these columns: df['uid'] = df[col_to_add].sum(axis=1) ...
Return html code of dynamic page using selenium
python,python-2.7,selenium,selenium-webdriver,web-scraping
You need to explicitly wait for the search results to appear before getting the page source: from selenium import webdriver from selenium.webdriver.support.wait import WebDriverWait from selenium.webdriver.common.by import By from selenium.webdriver.support import expected_conditions as EC wd = webdriver.Firefox() wd.get("https://www.leforem.be/particuliers/offres-emploi-recherche-par-criteres.html?exParfullText=&exPar_search_=true& exParGeographyEdi=true") wd.switch_to.frame("cible") wait = WebDriverWait(wd, 10)...
How can I detect a URL really exists despite a 301 or 302 redirect?
Use the steps outlined in diveintopython (copied and slightly cleaned bellow) if you want to use stdlib only. Otherwise, use something more nuanced (like Mechanize) to follow redirects. class SmartRedirectHandler(urllib2.HTTPRedirectHandler): def http_error_301(self, req, fp, code, msg, headers): result = urllib2.HTTPRedirectHandler.http_error_301( self, req, fp, code, msg, headers) result.status = code return...
Anaconda site-packages
python,python-2.7,pip,anaconda
You can import the module and check the module.__file__ string. It contains the path to the associated source file.
Identifying the nearest grid point
You can use numpy.searchsorted for this: import numpy as np lat=np.linspace(15,30,61) long=np.linspace(91,102,45) def find_index(x,y): xi=np.searchsorted(lat,x) yi=np.searchsorted(long,y) return xi,yi thisLat, thisLong = find_index(16.3,101.6) print thisLat, thisLong >>> 6, 43 # You can then access the `data` array like so: print data[thisLat,thisLong] NOTE: This will find the index of the lat and...
Is there a way to say for every x values, do this?
If you do lst[<start>:<end>] it would give the elements from <start> index (not value) inclusive, to <end> (end index) exclusive. An example might be able to explain this better - >>> lst = [1,2,3,4,5,6,7,8,9,10] >>> lst[0:5] [1, 2, 3, 4, 5] >>> lst[5:10] [6, 7, 8, 9, 10] Additionally, if...
Stopping list selection in Python 2.7
You can simply filter the tuples from the list as a generator expression and then you can stop taking the values from the generator expression when you get the first tuple whose second element is -1, like this >>> s = [(0,-1), (1,0), (2,-1), (3,0), (4,0), (5,-1), (6,0), (7,-1)] >>>...
Calculate, Sort and rearrange components
A counter dict is not the best approach for your problem, if you want to associate the value with the first part you encounter you can use the following approach which use a tuple of (Value, Package) as the key and sets the part to the first part we encounter...
Keep strings that occur N times or more
[s for s, c in counts.iteritems() if c >= 2] # => ['a', 'c', 'b'] ...
Why does `for lst in lst:` work? [duplicate]
In Python, when you say for identifier in iterable: first an iterator will be created from the iterable. So, the actual object will not be used in the looping. Then the iterator will be iterated and the current value will be bound to the name identifier. Quoting the official documentation...
how to fetch a column in browse_record_list in orm browse method in openERP
You can access all the fields of that table from the browsable object. id = browse_record.id name = browse_record.name Similarly you can access all the relational tables data as well, like customer in sale order. partner_id = sale_order_object.partner_id.id partner_name = sale_order_object.partner_id.name You can also update tables data through that browsable...
Compare 2 seperate csv files and write difference to a new csv file - Python 2.7
What do you mean by difference? The answer to that gives you two distinct possibilities. If a row is considered same when all columns are same, then you can get your answer via the following code: import csv f1 = open ("olddata/file1.csv") oldFile1 = csv.reader(f1) oldList1 = [] for row...
Pandas Dataframe Complex Calculation
python,python-2.7,pandas,dataframes
I believe the following does what you want: In [24]: df['New_Col'] = df['ActualCitations']/pd.rolling_sum(df['totalPubs'].shift(), window=2) df Out[24]: Year totalPubs ActualCitations New_Col 0 1994 71 191.002034 NaN 1 1995 77 2763.911781 NaN 2 1996 69 2022.374474 13.664692 3 1997 78 3393.094951 23.240376 So the above uses rolling_sum and shift to generate the...
Update label's text when pressing a button in Kivy for Python
python,python-2.7,button,label,kivy
Well! there was a real need for improvement in your code. (I understand it as you are not experienced.) Improvement: 1 An application can be built if you return a widget on build(), or if you set self.root.(You shouldn't make all of the gui in build function itself.) def build(self):...
Python do a lookup between 2 dictionaries
Just iterate the keys and values of the first dict and add the values from the second dict corresponding to the same key. mydict = {41100: 'Health Grant', 50050: 'Salaries', 50150: 'Salaries', 50300: 'Salaries'}; mytb = {'': '', 41100: -3450200.40, 50050: 1918593.96, 50150: 97.50, 50300: 8570.80} result = {} for...
Installing Python to a home directory
It is possible to install any Python version assuming your server has a compiler (GCC) installed you can use. Download Python source code here. Apply basic UNIX command knowledge to download and extract Gzip archive to a folder inside your home holder. Follow instructions to compile Python. Please note that...
Python root logger messages not being logged via handler configured with fileConfig
python,python-2.7,logging,configuration-files
A potential problem is that you are importing the module before you set up the logger configuration. That way, the module requests a logger before the logging is setup. Looking a fileConfig()'s documentation, the reason subsequent logging to the pre-obtained loggers fails is the default value for its disable_existing_loggers argument:...
How do I copy a row from one pandas dataframe to another pandas dataframe?
python,python-2.7,pandas,dataframes
Use .loc to enlarge the current df. See the example below. import pandas as pd import numpy as np date_rng = pd.date_range('2015-01-01', periods=200, freq='D') df1 = pd.DataFrame(np.random.randn(100, 3), columns='A B C'.split(), index=date_rng[:100]) Out[410]: A B C 2015-01-01 0.2799 0.4416 -0.7474 2015-01-02 -0.4983 0.1490 -0.2599 2015-01-03 0.4101 1.2622 -1.8081 2015-01-04 1.1976...
Issue while sharing semaphore objects between process in parallel python
python,python-2.7,multiprocessing,parallel-python
You're having this issue because you're passing the queue object when you submit the job: job = jobServer.submit(startt,(e,),(),("time", ), globals = globals()) # ^ here Two things to note: The queue is already global. You don't need to pass it as an argument. You can pass the queue as an...
'NoneType' object is not iterable - looping w/returned value
prog is returning None. The error you get is when you try to unpack the result into the tuple (s, best) You need to fix your logic so that prog is guaranteed to not return None. It will return None if your code never executes the else clause in the...
How to specify string variables as unicode strings for pattern and text in regex matching?
simply use re.match(myregex.decode('utf-8'), mytext.decode('utf-8')) ...
Import on class instanciation
It is possible to import a module at instantiation: class SpecificClassThatNeedRandomModule(object): def __init__(self): import randomModule self.random = randomModule.Random() However, this is a bad practice because it makes it hard to know when the import is done. You might want to modify your module so that it doesn't raise an exception,...
lookbehind for start of string or a character
regex,python-2.7,regex-lookarounds
re.compile(ur"(?:^|(?<=[, ]))(?:next to|near|beside|opp).+?(?=,|$)", re.IGNORECASE) You can club 3 conditions using [] and |.See demo. https://regex101.com/r/vA8cB3/2#python...
Pass function call as a function argument
The functions are returning tuples, because return only gives back one item. You can "unpack" the tuple returned by prepending it with an asterisk. The syntax will look like this: print function1(*function2(1,2)) ...
Adding time/duration from CSV file
python,python-2.7,csv,datetime
Use datetime.timedelta() objects to model the durations, and pass in the 3 components as seconds, minutes and hours. Parse your file with the csv module; no point in re-inventing the character-separated-values-parsing wheel here. Use a dictionary to track In and Out values per user; using a collections.defaultdict() object will make...
Reference a table column by its column header in Python
I think you'll really like the pandas module! http://pandas.pydata.org/ Put your list into a DataFrame This could also be done directly from html, csv, etc. df = pd.DataFrame(table[1:], columns=table[0]).astype(str) Access columns df['Column A'] Access first row by index df.iloc[0] Process row by row df.apply(lambda x: '_'.join(x), axis=0) for index,row in...
