How to take a list of tuples and change the tuples from strings to integers
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which of the following function convert a string to a tuple in python
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I have the code
l = [('1',['3','1','2']),('2',['4','5','2'])]
How do I make it:
l = [(1,[3,1,2]),(2,[4,5,2])]
You can use
int function while iterating using list comprehension
r = [tuple([int(i),[int(k) for k in j]]) for i,j in l]
This can be generalised using recursion:
def to_ints(item): if isinstance(item, list): return [to_ints(e) for e in item] elif isinstance(item, tuple): return tuple(to_ints(e) for e in item) else: return int(item)
Python, The interconversion from tuples to other formats have been discussed earlier. the logic to each string, split function is used to split the inner contents of list to different tuple attributes res = [ tuple ( map ( int , sub.split( ', ' ))) for sub in test_list]. Python | Converting all strings in list to integers Interconversion between data types is facilitated by python libraries quite easily. But the problem of converting the entire list of string to integers is quite common in development domain.
A simple approach is to remove the quotes and parse it back to a list
l = eval(str(l).replace("'", ""))
3. Strings, lists, and tuples — Beginning Python Programming for , We can use the numeric operators we saw last chapter with them to form numeric expressions. Strings, lists, and tuples are all sequence types, so called because they To find out what the replace method does, for example, we do this:. For example, myinput = "2 3", and I want to convert it to tuple,such as (2,3). However,if I do that, it will, of course, give me a tuple with String type, like ('2', '3'). I know that there are a lot of ways to solve the problem, but I'd like to know how to convert elements(str) in tuple to integer(in Python) in most efficient way.
8. Lists and Tuples — How to Think Like a Computer Scientist , The values that make up a list or tuple are called its elements, or its items. We will use Once Python has created a tuple in memory, it cannot be changed. The following list contains a string, a float, an integer, and (amazingly) another list:. Example: Convert Python Tuple to List. In the following example, we initialize a tuple with all integers and convert it to a list using list(sequence).
Python Tuple with example, On the other hand, we can change the elements of a list. A tuple can have heterogeneous data items, a tuple can have string and list as data items as well. example then python will treat my_data as an int variable rather than a tuple. Converting values, especially tuples, to lists can be useful when you need to have a mutable version of that value. We’ll use the list() method to convert the following tuple to a list. Because the syntax for creating a list uses parentheses, be sure to include the parentheses of the list() method, and in this case the print() method as well:
Tuples, If the argument is a sequence (string, list or tuple), the result of the call to tuple is a But if you try to modify one of the elements of the tuple, you get an error: For example, if you are expecting a list with one integer and I give you a plain old � Different Use Cases. At first sight, it might seem that lists can always replace tuples. But tuples are extremely useful data structures. Using a tuple instead of a list can give the programmer and the interpreter a hint that the data should not be changed.
- Does this answer your question? How to convert elements(string) to integer in tuple in Python
- Since tuples are immutable - you should iterate over your collections and recreate it.
- Please update your question with the code you have tried.
- Please do not use
evalfor something like this that can be accomplished easily using built-in features.
- Well you might be right that eval not necessarily a best practice, but in this case I can't see a drawback to it. Can you explain your reasoning?
- There's some existing discussion here.
- I read that post before posting my answer. None of the disadvantages stated are relevant to the OPs question other than the time difference which is still not a drastic difference. Actually using eval here saves time of looping on the list and it's sublists.