Either way, in python, you can't manipulate the iterator in python in a for loop like you can in C, so you'll have to use a while loop. The range function takes 3 arguments: start, stop, and step: yield i. To go in reverse.

I am in need of some help doing some simple calculations in a for loop. I have two columns in the below example file. Column 1 is the date-time-hr-min-ss and column 2 is a value. I would like to p...

Jan 16, 2017 · for negative integers use cmath module which is a built in module of python https://docs.python.org/2/library/cmath.html. I hope this answer helps you : if i<=0: print str(i) + ": " + str(cmath.sqrt(i)) print str(cmath.sqrt(i)-cmath.sqrt(i-1)) else: print str(i) + ": " + str(m.sqrt(i)) print str(m.sqrt(i) - m.sqrt(i-1)) and the output will be :

A for loop is used for iterating over a sequence (that is either a list, a tuple, a dictionary, a set, or a string). This is less like the for keyword in other programming languages, and works more like an iterator method as found in other object-orientated programming languages.

Apr 10, 2024 · Alternatively, you can use a simple for loop. This is a four-step process: Declare a new variable that stores an empty list. Use a for loop to iterate over the original list. On each iteration, subtract the number from the current item. Append the result to the new list. new_list.append(item - 5) print(new_list) # 👉️ [0, 10, 20, 30, 40]

In this Python tutorial, we explore two key concepts: subtraction and for loops. Learn how to perform subtraction operations in Python and effectively use for loops for iteration.

Oct 4, 2021 · Learn how to use Python to subtract two lists, using the numpy library, the zip function, for-loops, as well as list comprehensions.

Apr 9, 2025 · Subtracting two numbers in Python can be done in multiple ways. The most common methods include using the minus operator (-), defining a function, using a lambda function, or applying bitwise operations. Each method has its use cases depending on simplicity, readability and performance needs.

There are six ways to subtract two lists in Python. 1. Using a for loop. 2. Using a while loop. 3. Using list comprehensions. 4. Using the zip () function. 5. Using the numpy library. 6. Using map and lambda functions.

Jan 30, 2022 · I have an array a = [4,3,2,1] What I am trying to achieve is that I need a single value on subtracting the elements in the array that is 4-3-2-1. I tried the below this using for loop but it does not seem to work. I don't seem to get the right value on execution. def sub_num(arr): difference = arr[0] n = len(arr) print(n) print(i)