If I understand your post correctly you want to access a specific subcollection of all documents. If so, you are looking for a collection group query, which reads documents from all collections with a specific name. Accessing that in Python is (according to the documentation linked above) done with: museums = db.collection_group(u’landmarks’)\ .where(u’type’, u’==’, u’museum’) … Read more
Negative numbers for an index takes the values starting from the end of the array. solved What does python array -1 mean? [duplicate]
Some languages, you showed a python example, support generators that don’t have a return statement, they yield a value on each iteration. In Python, the statement: result = someFunc() makes result refer to a generator object, which you can then use the next() builtin to get the next value. In the Python for loop the … Read more
From you saying the only difference is 1 becomes 2 I’m guessing you are just trying to run the loop again for a second user, perhaps a dictionary here, then you could just iterate the loop you already have constructed for each user in the dicitonary, you would have to touch up your loops I … Read more
X start out as apple the first iteration and then goes to cherry the secound iteration solved (python) why the result of this code not in right order? [closed]
z is a list so you can access each element : >>> n = input() 19894984 >>> z=[int(d) for d in str(n)] >>> z [1, 9, 8, 9, 4, 9, 8, 4] >>> a=z[0] >>> a 1 >>> a=z[5] >>> a 9 and iterate trough it : >>> for i in z: … print i … Read more
Ok, this will get you just started with the basics, but you’ll have to figure out the logic of your math, the various index values, and order of operations to solve your problem. This simply opens a file and displays its contents. The data is read as strings, and converted to floats so that you … Read more
According to the De Morgan’s law, not (A and B) is not A or not B. You can verify this using simple python script: In [1]: def test(fn): …: for beta in [False, True]: …: for gamma in [False, True]: …: print(f’beta: {beta}, gamma: {gamma}, ans: {fn(beta, gamma)}’) …: In [2]: test(lambda beta, gamma: not … Read more
We have: xs = [“A”, “B”, “C”] ys = [1, 2, 3] Let’s take a simple example: f repeats y times the char x f=lambda x,y:x*y The computation of the matrix is obvious: for each y, we compute a row of f(x,y) with all x in xs. matrix = [[f(x,y) for x in xs] for … Read more
A better approach is to use a while loop to collect input, and only exit the while loop after receiving valid data. num1 = 0 while num1 == 0: value = input(…. if ValidateInput(value): num1 = value num2 = 0 while num2 == 0: value = input(…. if ValidateInput(value): num2 = value # do other … Read more
Try this: nest = [[0,0,0,0,0],[0,0,0,0,0],[0,0,0,0,0]] x = 1 y = 3 for array in nest: for i in range(x, y+1): array[i] = 1 print(nest) I think you would benefit from a basic Python tutorial too, for example try codecademy.com. 3 solved Python – Replacing Indice Values in Nested Lists
I believe what you’re asking is how to call a function from within another one def one_good_turn(n): return n + 1 def deserves_another(n): return one_good_turn(n) + 2 n = 1 print one_good_turn(n) print deserves_another(n) 0 solved Functions calling functions in Python
gs.translate(‘this is a pen’,’bn’) produces a Unicode string. If you just type gs.translate(‘this is a pen’,’bn’) into the interactive interpreter it prints the representation of that string which is u’\u098f\u0987 \u098f\u0995\u099f\u09bf \u0995\u09b2\u09ae’. But when you type print(gs.translate(‘this is a pen’,’bn’)) the Unicode data is encoded into a stream of bytes using the default encoding (which … Read more
You can implement this efficiently by using the same algorithm that grep uses to find words. This is the Boyer-Moore string search algorithm. Fundamentally you search for the last letter of the string. You do this by creating a list of all of the letters in your target word, and then you inspect letters in … Read more
The user leaf gave me the answer. a = [1, 2, 3] b = [(1, 2, 3)] if tuple(b[0]) != a: print “a does not equal b” else: print “a and b are the same!” Result >>> a and b are the same! 0 solved How to pull a list out of an array in … Read more