Java is statically typed so you can’t point a variable to an instantiated object without declaring the class. You can create classes without a pointer but they will just be collected by the garbage collection machine unless you’re passing them to something that uses the new object you’re creating. This is nothing in Java: myObject … Read more
I tried this and now it worked query2 =”””insert into table xyz(select * from abc where date_time = %s)””” cur.execute(query2,(rows)) Though, I don’t know why it worked and how is it different from what I was trying earlier solved SQL Date Variables in Python
You could use… but all depends on what you’re after – there are other ways… >>> a = [5, 2, 3, 4, 1] >>> b= [3, 1, 5] >>> sorted(b, key=a.index) [5, 3, 1] Or as @Manan has pointed out – you can in-place sort using a.sort(…) solved Sorting an array based on another array … Read more
What you are trying to do is impossible to do in any predictable way using regular dictionaries. As @PadraicCunningham and others have already pointed out in the comments, the order of dictionaries is arbitrary. If you still want to get your result, you must use ordered dictionaries from the start. >>> from collections import OrderedDict … Read more
This is a common pitfall of the API. Please consider carefully the following: The PlaylistItems endpoint queried for the uploads list of a channel produces an items list which is ordered by videoPublishedAt. But the items themselves contains publishedAt datetime properties attached. (The emphasis below is mine.) videos#snippet.publishedAt (datetime) The date and time that the … Read more
I’d do it this way: result = [] reader = [‘sdsd-sdds’, ‘asaad’, ‘deded – wdswd’, ‘123’ ] str_1 = ‘deded -‘ for x in reader: if str_1 in x: result.append(reader[reader.index(x) + 1]) print(result) If you want to stop after finding the first one you should use a break after finding a value: result = [] … Read more
It works as expected. remove affects the initial list but returns nothing (None). Print outer again and it should be shorter. 0 solved python – List.remove method not applicable as the function with the map builtin?
I would be careful about the indexing of u and y when using nbefore and nafter so that I don’t get index out of bounds error. Here is a Pythonic way – ynew = [dt * u[i] + y[i] for i in xrange(1,n+1)] unew = [dt * (k / m) * (y[i+1] + y[i-1]) for … Read more
Go to this link: http://pythontutor.com/visualize.html#mode=edit paste your code and press the Visualize Execution, i think you will understand everything. 1 solved Explain this python code from a newbies book [closed]
You could use a comprehension(But you need to convert those numbers to string), Try code below: converted = {‘w’: 4, ‘a’: 3, ‘d’: 1, ‘e’: 1, ‘x’: 6} print(“”.join([str(char) for k, v in converted.items() for char in (k, v)])) solved Join Operation for Dictionary in Python [closed]
self.tracks seems to be an (n,2) list. The outer loop takes each of these values, turns them two by two into integers x and y, then performs a function/method cv2.circle with an object mask and several other parameters. container[-1] indicates that you want the value of the last index of container. The values of the … Read more
You could try something like this: f = open(“C:/file.txt”, “r”) #name of file open in read mode lines = f.readlines() #split file into lines print(lines[1]) #print line 2 from file 1 solved Reading and Writing from files in python [closed]
What you are trying to do is to unpack the elements of the list into parameters. This can be done like this: Albaqus_Function(*coord_list[0:n]) Where n is the last index+1. The *args notation is used as the following: arguments = [“arg1”, “arg1”, “arg3”] print(*arguments) This will be equivalent to: print(“arg1”, “arg2”, “arg3”) This is useful when … Read more
Option 1 – as recommended @StefanPochmann, @rayryeng and @Clayton Wahlstrom. index = [i for (i, j) in enumerate(y) if j] print(random.sample(index, 2)) Option 2 – My original horrible implementation… import random y = [1,0,0,0,0,1,0] i = 0 index =[] for each in y: if each == 1: index.append(i) i = i + 1 print(random.sample(index, 2)) … Read more
I think the smallest set of changes that will make this work is: class TemperatureFile: def __init__(self, filename): self.__filename = filename def getFilename(self): return self._Filename def setFilename(self): self._filename = filename def calculateAverage(self): try: with open(self.__filename,’rb’) as temperatureFile: total = 0 temp = 0 for line in temperatureFile: amount = float(line.rstrip(“\n”)) total += amount temp = … Read more