Python program 1 find sum of numbers entered by user

certainly! let’s walk through a simple python program that finds the sum of numbers entered by the user. this tutorial will cover the following steps:

1. **understanding input and output in python**
2. **using a loop to collect user input**
3. **calculating the sum of the inputted numbers**
4. **displaying the result**

### step 1: understanding input and output in python

in python, we can use the built-in `input()` function to take input from the user. the input is received as a string, so it will need to be converted to a number (integer or float) if we want to perform mathematical operations on it.

### step 2: using a loop to collect user input

to continuously collect numbers from the user until they choose to stop, we can use a loop. a common approach is to use a `while` loop that allows the user to enter numbers until they enter a specific command (like 'done' or 'exit').

### step 3: calculating the sum of the inputted numbers

we can maintain a running total of the numbers entered by initializing a variable to store the sum and updating it inside the loop.

### step 4: displaying the result

finally, we will print the total sum to the user.

### example code

here’s a complete example of a python program that implements the above steps:

### explanation of the code

1. **function definition**: we define a function called `main()` to encapsulate our program logic.

2. **sum initialization**: we initialize a variable `total_sum` to store the cumulative sum of the numbers entered.

3. **user prompt**: we inform the user how to use the program.

4. **input loop**: we enter a `while true` loop, which will keep asking for input until the user types 'done'.

5. **input handling**:
- if the user types 'done', we break out of the loop.
- we try to convert the input to a float. if the conversion fails (due to invalid input), we catch the `valueerror` and print an error message.

6. **sum calculation**: if the input is valid, we add it to `total_sum`.

7. ...

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