What is the typical underlying data structure used to implement Python's built-in list data type?
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How are lists in python stored internally? Is it an array? A linked list? Something else?
Or does the interpreter guess at the right structure for each instance based on length, etc.
If ... |
I have a hierarchical two combo-box. The first combo-box displays a list of customerNames, i.e. different companies from a MySQL db. Each customer has branches in different cities.
Then, when a customer ... |
If I have a list in python such as:
stuff = [1, 2, 3, 4, 5, 6, 7, 8, 9]
with length n (in this case 9) and I am interested ... |
I have a dictionary of data, the key is the file name and the value is another dictionary of its attribute values. Now I'd like to pass this data structure to ... |
I have a module which supports creation of geographic objects using a company-standard interface. After these objects are created, the update_db() method is called, and all objects are updated into a ... |
First let me say that I thought that the way data storage worked in python is that everything is an object so there is no need for such things as pointers. ... |
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I have three list A,B and C. I want to write the contents of the list to the file like this:
A[1]
B[1]
C[1]
A[2]
B[2]
C[2]
.
.
.
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I have a nested list e.g.:
nlist = [
[1, 2, 3],
[4, 5, 6], ...
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I am aware of many probabilistic functions builted-in python, with the random module.
I'd like to know if, given a list of floats, would be possible to find the distribution equation that ... |
Quick Python question: How do I access data from a nested list like this:
{'album': [u'Rumours'], 'comment': [u'Track 3'], 'artist': [u'Fleetwood Mac'], 'title': [u'Never Going Back Again'], 'date': [u'1977'], 'genre': [u'Rock'], 'tracknumber': ... |
Consider list of x/y co-ordinates and a byte 'count'. x/y will have a range of perhaps 0 to 5000 which is 25 million cells.
However the data will be quite sparsely populated, ... |
The long (winded) version:
I'm gathering research data using Python. My initial parsing is ugly (but functional) code which gives me some basic information and turns my raw data into a format ... |
Having a such list of list:
data = [['a','x'], ['b','q'], ['c','z']]
search = 'c'
any(e[0] == search for e in data)
This returns boolean value but what if I want to retrieve the first appearing ... |
I'm looking for an efficient way of solving a particular problem in Python. I have a stream of events arriving each with an associated timestamp. Conceptually I add these events to ... |
I have this code
list = ['a','b','c']
if 'b' in list:
return "found it"
return "not found"
Now, how does this work? Does it traverse the whole list comparing the element? Does it ... |
This is homework but the lesson gives me the answer already. I'm having trouble putting the words from the answer to the line of code
#Calculate all the primes below 1000
...
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I have about half a million items that need to be placed in a list, I can't have duplications, and if an item is already there I need to get it's ... |
I can't seem to figure out how to get a list of a classes data descriptors. Basically, I want to run some validation against the fields and unset fields. For instance:
class ...
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Hi everyone, I am trying to create an xml using the xml.dom.mini module, what i am trying to do is to fetch the data from the database and make it hold inside a list for some time and than pass the complete list to my xml_writer function, what i have doubt is 1) would not it create problem if i make ... |
def getFile(): to_be_read = raw_input("which file to read? ") try: f = open(to_be_read, "r") txt = f.readlines() f.close() return txt except ... |
Basically, I want to read each row of data, and assign as a list. However, the commas separating the data are not causing each row to be treated as a list. Instead, every character is being interpreted as a member of the list. The actual data values are not important. It looks like I should use the CSV module to parse ... |
Hello, I am new to python programming. I have a text file of data, say 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 I want to be able to list the 2nd coloumn, 0.6, 0.9 & 1.2. I started off with this code: coloumn=[] for line in data_list: data=line.split() print data Python generates this, ['0.5', '0.6', '0.7'] ['0.8', '0.9', '1.0'] ... |
infile = str(sys.argv[1]) outfile = str(sys.argv[2]) f=open(infile, 'r') g=open(outfile, 'w') tempFile=tempfile.TemporaryFile() for line in fileinput.input(infile): words = string.split(line, ',')#splits the line at ',' if len(words) >= 3: L = (words[1])#put column into list L1 = (words[2]) ... |
Simple newbie question: I have opened a data file (network links) and I read it into a list that looks like this: ['AB AC', 'BE BD', 'CD CE', 'EC EB ED', 'DF' ] What are some ways to refer to the different values in this list?? Within the first quote are the segments that link to A (AB and AC), within ... |
Please I am really new in python, I am trying to write a code to find temperature houly data, I have the procces, but please anyone can teach me how to put the out put data (taux) in a list to print it in a text document. here is my code.... tmin0= -0.6 tmax0= 12.8 tdew0= -0.7 tmin = -2.2 tmax ... |