Missing Number From 1 to 1000

EasyPython

Problem

You have the numbers from 1 to 1000 and one is missing. How can you find it?

Implement the function below. The input list contains every integer from 1 through n except one value, where n = 1000 for the stated problem. The same function may be tested with smaller n values.

Input: nums, a list of integers, and n, the upper bound. Output: the missing integer.

Constraints

2 <= n <= 1000
nums.length == n - 1
nums contains distinct integers from 1 through n except one value
The missing value is guaranteed to exist

Function Signature

def find_missing_number(nums, n):

CodePython 3

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Run your code to see test output here.