Write a python code to find the sum of 100 to 1000 and print the same

Sum the integers from 1 to 100 in Python #

To sum the integers from 1 to 100:

1. Pass 1 and 100 + 1 to the range class, e.g. range[1, 100 + 1].
2. Pass the range object to the sum[] function.
3. The sum function will sum the integers from 1 to 100.

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num = 100

total = sum[range[1, num + 1]]
print[total]  # 👉️ 5050

# 👇️ [1, 2, 3, ... 98, 99, 100]
print[list[range[1, num + 1]]]

# ------------------------------------------------

# 👇️ alternatively, you can use a formula

total_2 = num * [num + 1] // 2

print[total_2]  # 👉️ 5050

We used the range[] class to sum the numbers from 1 to 100.

The range class is commonly used for looping a specific number of times in for loops and takes the following arguments:

Notice that we added 1 to the stop value. The stop argument is exclusive, so we had to add 1 to include 100 in the result.

If you only pass a single argument to the range[] constructor, it is considered to be the value for the stop parameter.

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num = 100

total = sum[range[num + 1]]
print[total]  # 👉️ 5050

# 👇️ [1, 2, 3, ... 98, 99, 100]
print[list[range[num + 1]]]

The example shows that if the start argument is omitted, it defaults to 0 and if the step argument is omitted, it defaults to 1.

Since the start argument of the range is 0, you can omit it and you'd get the same result.

If values for the start and stop parameters are provided, the start value is inclusive, whereas the stop value is exclusive.

The sum function can be used to calculate the sum of the numbers in the range.

The sum function takes an iterable, sums its items from left to right and returns the total.

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num = 100

total = sum[range[1, num + 1]]
print[total]  # 👉️ 5050

The sum function takes the following 2 arguments:

If you need to get a range with a step, pass a value for the third argument of the range[] class.

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start = 1
stop = 100
step = 3

total_2 = sum[range[start, stop + 1, step]]

print[total_2]  # 👉️ 1717

# 👇️ [1, 4, 7, 10, ... 94, 97, 100]
print[list[range[start, stop + 1, step]]]

When the step argument is provided, the range will consist of every N numbers from start to stop.

The value for the step argument defaults to 1.

You can also sum the numbers from 1 to 100 using a formula.

Copied!
num = 100

total_2 = num * [num + 1] // 2

print[total_2]  # 👉️ 5050

We multiply 100 by 100 + 1 and floor-divide the result by 2 to get the sum of the integers from 1 to 100.

Division / of integers yields a float, while floor division // of integers result in an integer.

The result of using the floor division operator is that of a mathematical division with the floor[] function applied to the result.