Removing Punctuation From Python List Items
Assuming that your initial list is stored in a variable x, you can use this: To remove the empty strings:
list
Whats the difference between ‘for x in list:’ and ‘for x in list[:]:’
xs[:] copies the list. for x in xs — Iterate over the list xs as-is. for x in xs[:] — Iterate over the a copy of list xs. One of the reasons why you’d want to “iterate over a copy” is for in-place modification of the original list. The other common reason for “copying” is atomicity of the data you’re dealing … Read more
In Python, when to use a Dictionary, List or Set?
A list keeps order, dict and set don’t: when you care about order, therefore, you must use list (if your choice of containers is limited to these three, of course 😉 ). dict associates each key with a value, while list and set just contain values: very different use cases, obviously. set requires items to be hashable, list doesn’t: if you have non-hashable items, therefore, you cannot use set and must instead use list. … Read more
How to check if a string is a substring of items in a list of strings?
If you only want to check for the presence of abc in any string in the list, you could try If you really want to get all the items containing abc, use
Alphabet range in Python
If you really need a list: And to do it with range Other helpful string module features:
Inorder Binary Tree Traversal (using Python)
The reason this doesn’t work is that res only has the value of the first node you give it appended to it; each time you recursively recall the function, it just makes a new res. It is a simple fix though, as follows: In this, it returns the left branch, the value, and then the right. This … Read more
Why do I get an UnsupportedOperationException when trying to remove an element from a List?
Quite a few problems with your code: On Arrays.asList returning a fixed-size list From the API: Arrays.asList: Returns a fixed-size list backed by the specified array. You can’t add to it; you can’t remove from it. You can’t structurally modify the List. Fix Create a LinkedList, which supports faster remove. On split taking regex From the API: String.split(String regex): Splits this string around matches of the given regular expression. … Read more
TypeError: list indices must be integers or slices, not str
First, array_length should be an integer and not a string: Second, your for loop should be constructed using range: Third, i will increment automatically, so delete the following line: Note, one could also just zip the two lists given that they have the same length:
Python return list from function
Variables cannot be accessed outside the scope of a function they were defined in. Simply do this:
How to deep copy a list?
E0_copy is not a deep copy. You don’t make a deep copy using list(). (Both list(…) and testList[:] are shallow copies.) You use copy.deepcopy(…) for deep copying a list. See the following snippet – Now see the deepcopy operation