I was playing around in python. I used the following code in IDLE: The output was: What is this […]? Interestingly I could now use this as a list of list of list up to infinity i.e. I could write the above as long as I wanted and it would still work. EDIT: How is it represented in memory? What’s
Tag: list
python list append gives a error: AttributeError: ‘function’ object has no attribute ‘append’
I have list = [] and I am adding an element to it using self.list.append(‘test’) and I get this error – AttributeError: ‘function’ object has no attribute ‘append’ The other list that I have defined append just fine, any ideas? Answer It seems you have a function in your code that is shadowing Python’s built-in function named list.
Python assigning multiple variables to same value? list behavior
I tried to use multiple assignment as show below to initialize variables, but I got confused by the behavior, I expect to reassign the values list separately, I mean b[0] and c[0] equal 0 as before. Result is: [1, 3, 5] [1, 3, 5] [1, 3, 5] Is that correct? what should I use for multiple assignment? what is different
Python: How to not print comma in last element in a for loop?
My code iterates over a set and print actor’s names: The result looks like: But I want it to detect the last element so that it won’t print the last comma. The result should be instead: How can I do that? Answer
Alphabet range in Python
How do I create a list of alphabet characters, without doing it manually like this? Answer Alternatively, using range: Or equivalently: Other helpful string module features:
Grouping Python dictionary keys as a list and create a new dictionary with this list as a value
I have a python dictionary Since the values in the above dictionary are not unique, I want to group the all the keys of unique values as a list and create a new dictionary as follows: Note the keys of new dictionary v should be sorted. I am finding it hard to visualize and implement this dictionary creation. Answer Using
Sum of numbers in array, not counting 13 and number directly after it (CodingBat puzzle)
The Question: Return the sum of the numbers in the array, returning 0 for an empty array. Except the number 13 is very unlucky, so it does not count and numbers that come immediately after a 13 also do not count. My Code: Where It’s Failing: Answer Your problem is when x is zero. x – 1 will be -1
How to check if a specific integer is in a list
I want to know how to make an if statement that executes a clause if a certain integer is in a list. All the other answers I’ve seen ask for a specific condition like prime numbers, duplicates, etc. and I could not glean the solution to my problem from the others. Answer You could simply use the in keyword. Like
Possible to append multiple lists at once? (Python)
I have a bunch of lists I want to append to a single list that is sort of the “main” list in a program I’m trying to write. Is there a way to do this in one line of code rather than like 10? I’m a beginner so I have no idea… For a better picture of my question, what
Add SUM of values of two LISTS into new LIST
I have the following two lists: Now I want to add the items from both of these lists into a new list. output should be Answer The zip function is useful here, used with a list comprehension. If you have a list of lists (instead of just two lists):