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",...
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 >>>...
Common elements between two lists of lists (intersection of nested lists) [duplicate]
python,python-2.7,numpy,nested-lists
Lists are not hashable so we need to convert the inner list to tuple then we can use set intersection to find common element t1 = [[3, 41], [5, 82], [10, 31], [11, 34], [14, 54]] t2 = [[161, 160], [169, 260], [187, 540], [192, 10], [205, 23], [3,41]] nt1...
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"...
Keep strings that occur N times or more
[s for s, c in counts.iteritems() if c >= 2] # => ['a', 'c', 'b'] ...
'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...
Strange Behavior: Floating Point Error after Appending to List
Short answer: your correct doesn't work. Long answer: The binary floating-point formats in ubiquitous use in modern computers and programming languages cannot represent most numbers like 0.1, just like no terminating decimal representation can represent 1/3. Instead, when you write 0.1 in your source code, Python automatically translates this to...
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...
Use NamedTemporaryFile to read from stdout via subprocess on Linux
python-2.7,subprocess,temporary-files
Unless stdout=PIPE; p[0] will always be None in your code. To get output of a command as a string, you could use check_output(): #!/usr/bin/env python from subprocess import check_output result = check_output("date") check_output() uses stdout=PIPE and .communicate() internally. To read output from a file, you should call .read() on the...
PySerial client unable to write data
Obviously, /dev/tnt0 is not a serial device, or there is something wrong with that. Otherwise, your code looks valid.
Appending lines for existing file in python [duplicate]
The issue is in the code - curr_file = open('myfile',w) curr_file.write('hello world') curr_file.close() The second argument should be a string, which indicates the mode in which the file should be openned, you should use a which indicates append . curr_file = open('myfile','a') curr_file.write('hello world') curr_file.close() w mode indicates write ,...
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...
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...
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...
Operational error while using stripe with profile app
django,python-2.7,django-templates,stripe-payments
It's kind of weird. But when I followed "No Such Table error" and tested DB it was still empty. So this time I deleted DB but also migrations. Problem is fixed and its just working fine.
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...
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...
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')) ...
Using OR operator in NumPy Array to Append multiple items
Instead of doing the "OR" inside the append, you'll need to do an if statement: if category == 'bulky item': items.append((Address, x, y, x, y, ReasonCode, SRNumber, SRNumber, FullName, ResolutionCode, HomePhone, CreatedDate, UpdatedDate, BulkyItemInfo, k_bulky_comm, ServiceDate, CYLA_DISTRICT, SCCatDesc, # ServiceNotes, Prior_Resolution_Code, CYLA_DISTRICT, )) elif category == 'e-waste': items.append((Address, x, y,...
Problems with MySQLdb python
python,python-2.7,tkinter,mysql-python
Like Bryan said, that may be the issue with your code, instead of making the button call conn.getConnection() directly, try an approach, where you save the entry variables into 'self' and then when the button is invoked, you create the connection at that time. The code would look something like...
Who calls the metaclass
You can find the answer relatively easily. First, lets find the opcode for building a class. >>> def f(): class A(object): __metaclass__ = type >>> import dis >>> dis.dis(f) 2 0 LOAD_CONST 1 ('A') 3 LOAD_GLOBAL 0 (object) 6 BUILD_TUPLE 1 9 LOAD_CONST 2 (<code object A at 0000000001EBDA30, file...
Iterate over all links/sub-links with Scrapy run from script
python,windows,python-2.7,web-scraping,scrapy
Your spider is being blocked from visiting pages after the start page by your allowed_domains specification. The value should include just the domain, not the protocol. Try allowed_domains = ["www.WebStore.com"] Also the line desc_out = Join() in your WebStoreItemLoader definition may give an error as you have no desc field....
How to extract efficientely content from an xml with python?
python,xml,python-2.7,pandas,lxml
There are several things wrong here. (Asking questions on selecting a library is against the rules here, so I'm ignoring that part of the question). You need to pass in a file handle, not a file name. That is: y = BeautifulSoup(open(x)) You need to tell BeautifulSoup that it's dealing...
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...
summing string and integers in list in python
You need: total = value[c1-1]+value[c2-1] ...
Simulating Fibonacci's Rabbits with multiple offsprings using python
python,python-2.7,dynamic-programming
The process for a single step is to replace all 'M's with 'MNNN' and all 'N's with 'M', so: def step(state): return ''.join(['MNNN' if s == 'M' else 'M' for s in state]) For example: >>> s = 'N' >>> for _ in range(5): print s, len(s) s = step(s)...
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...
Identify that a string could be a datetime object
python,regex,algorithm,python-2.7,datetime
What about fuzzyparsers: Sample inputs: jan 12, 2003 jan 5 2004-3-5 +34 -- 34 days in the future (relative to todays date) -4 -- 4 days in the past (relative to todays date) Example usage: >>> from fuzzyparsers import parse_date >>> parse_date('jun 17 2010') # my youngest son's birthday datetime.date(2010,...
Python Popen - wait vs communicate vs CalledProcessError
python,python-2.7,error-handling,popen
about the deadlock: It is safe to use stdout=PIPE and wait() together iff you read from the pipe. .communicate() does the reading and calls wait() for you about the memory: if the output can be unlimited then you should not use .communicate() that accumulates all output in memory. what...
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.
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...
Python initialize strings as variable
#!/usr/bin/python m = 2 k = m*2 calc = "((k+m+46)/2)" result = eval(calc) print result Result 26 ...
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...
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...
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)] >>>...
Open a file from user input in python 2.7
python,python-2.7,user-interface,user-input
The issue is in the lines - selectfile = file(raw_input("Enter Filename: "), 'r') with open(selectfile, 'r') as inF: You need to open the filename (which is inputted from user) directly, as below - with open(raw_input("Enter Filename: "),'r') as inF: Also, there seems to be an indentation issue in your code,...
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...
from x(defined in program) import y(defined in program) python
python,python-2.7,import,filenames
You can't use a variable for an import statement. from x import y will try to find a module literally called y. In your case, that probably means you want a file in the same directory called y.py. It will then try to find a variable (including, eg, a function...
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,...
