Open the file and read all lines with open(“file.txt”) as f: lines = f.read().splitlines() Make a list of lines that contain the word “Error” data = [ line.lstrip(‘<‘).rstrip(‘>’).split(‘><‘) for line in lines if ‘Error’ in line ] Get the time and message items from the data list errors = [ { ‘time’ : line[0], ‘message’: … Read more
This is the proper indentation you need to use. def mystery(n): m = “” while n > 0: m += str(n % 10) n //= 10 return m When you call the function: mystery(9870) ‘ 0789’ The function takes a parameter and checks if it is greater than 0. While the condition is satisfied, it … Read more
I dunno why one would do it without built-in functions, but here’s a working bubble sort example. http://rosettacode.org/wiki/Sorting_algorithms/Bubble_sort#Python def bubble_sort(seq): “””Inefficiently sort the mutable sequence (list) in place. seq MUST BE A MUTABLE SEQUENCE. As with list.sort() and random.shuffle this does NOT return “”” changed = True while changed: changed = False for i in … Read more
Let’s see here… reshape, crop = { 1: ((1952, 3264), (1944, 3240)), 2: ((2480, 4128), (2464, 4100)), } This here is defining a dictionary with keys 1 and 2. Attached to each key is a tuple of tuples. I believe there are more entries in the real code, going by the comma on the last … Read more
input_arr = [ “New: Hello”, “How are”, “you”, “New: I am”, “fine” ] def merge_messages(input_arr): delimiter = “New” return [delimiter+x for x in ” “.join(input_arr).split(delimiter) if x] print(merge_messages(input_arr)) However, I would highly recommend you take the advice given to you in the comments and read up on Python Strings. You can also view the Python … Read more
You can do this with this code: def generate_matrix(size): “””Generate lists which form an eye matrix””” for i in range(size): # First, we create a new list with size 0s. l = [0] * size # At the specified position, we place a 1. l[i] = 1 # We yield this new list. yield l … Read more
Well, almost in one line (if you allow me to import the itertools module): [ x for x in itertools.takewhile( lambda line: sync(line) == 0, # <- predicate open(“file.txt”)) ] # <- iterable Example w/o file: >>> import itertools >>> def sync(n): … if n == 3: return -1 # error … return 0 >>> … Read more
If you are iterating over the items in some container, just iterate over that container; don’t use the index unless you need to. Right: slots = [1, 2, 3, 7] for slot in slots: print cards[slot] Wrong (or at least “writing C/C++/Java/C#/whatever in Python”): slots = [1, 2, 3, 7] for i in range(len(slots)): print … Read more
Strip from the left with str.lstrip(): >>> sales = [‘$1.21’, ‘$2.29’, ‘$14.52’, ‘$6.13’, ‘$24.36’, ‘$33.85’, ‘$1.92’] >>> [s.lstrip(“$”) for s in sales] [‘1.21’, ‘2.29’, ‘14.52’, ‘6.13’, ‘24.36’, ‘33.85’, ‘1.92’] 1 solved How can I remove dollar signs ‘$’ from a list in Python?
wrong MAX_WRONG does not make sense. You’ll need an operator between those two identifiers. You’re probably looking for <. 0 solved Invalid Syntax on perfectly correct while loop? [closed]
You can use random.choice() and do something like this: import random for i in range(4): # add 4 entries from l2 and l3 l.append(random.choice(l2)) l.append(random.choice(l3)) Hope this helps. 0 solved Adding and deleting random entries from a list inside another list in Python?
You can loop over values like this: for x in [-60.0, -45.0, -30.0]: # etc; notice how the .0 specifies a float print(‘D({0}) = {1}’.format(x, A*math.cos(x)**2+B*math.sin(x)+C)) If you intend for the output to be machine-readable, maybe change the format string to something like ‘{0},{1}’ for simple CSV output. Just print will print nothing (well, or … Read more
It seems like you are trying to use an array and an int with the operand “**” althought it expects two ints or at least two numbers. Maybe you want to use sum_x or sum_xy as the first argument instead? solved how do you address type error in python [duplicate]
The initial value of current_line is 1. When you call, current_line = current_line + 1, we first evaluate what’s on the right hand side of the =. That is current_line + 1, which gives 2. Now 2 gets assigned to the variable on the left of =, which is current_line. So now current_line is 2! … Read more
I don’t think I fully understand your question. Posting your code and an example file would have been very helpful. This code will count all entries in all files, then it will identify unique entries per file. After that, it will count each entry’s occurrence in each file. Then, it will select only entries that … Read more