Python | Solve given list containing numbers and arithmetic operators
Given a list containing numbers and arithmetic operators, the task is to solve the list.
Example:
Input: lst = [2, '+', 22, '+', 55, '+', 4] Output: 83 Input: lst = [12, '+', 8, '-', 5] Output: 15
Below are some ways to achieve the above tasks.
Method #1: Using Iteration
We can use iteration as the simplest approach to solve the list with importing different operators.
# Python code to solve the list# containing numbers and arithmetic operators # Importingfrom operator import add, sub # Function to solve listdef find(Input): ans = 0 options = {'+': add, '-': sub} option = add for item in Input: if item in options: option = options[item] else: number = float(item) ans = option(ans, number) return ans # Input Initializationlst = [91, '+', 132, '-', 156, '+', 4] # Calling functionOutput = find(lst) # Printing outputprint("Initial list", lst)print("Answer after solving list is:", Output) |
Output:
Initial list [91, '+', 132, '-', 156, '+', 4] Answer after solving list is: 71.0
Method #2: Using eval and join
# Python code to solve the list# containing numbers and arithmetic operators # Input list initializationlst = [2, '+', 22, '+', 55, '+', 4] # Using eval and joinOutput = eval(' '.join(str(x) for x in lst)) # Printing outputprint("Initial list", lst)print("Answer after solving list is:", Output) |
Output:
Initial list [2, '+', 22, '+', 55, '+', 4] Answer after solving list is: 83
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