Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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I have created a code, and I wonder that in each line, I need help in explaining in # comments which tells what is happening in that line of code.

 

```python
import random

def middle(l):
    if len(l) > 1:
        l = l[1:-1]
    return l

def main():
    l = []
    x = random.randint(1, 10)
    for i in range(x):
        l.append(i+1)
    if len(l) == 1:
        print("No change made to list.")
    print("List Length =", x)
    print(l)
    print(middle(l))

main()
```

### Explanation:

- **Line 1:** The `random` module is imported to generate a random number.

- **Function `middle(l):`** 
  - **Lines 3-6:** This function takes a list `l` and checks if its length is greater than 1. If true, it returns a new list with the first and last elements removed.

- **Function `main():`**
  - **Line 9:** Initializes an empty list `l`.
  - **Line 10:** Generates a random integer `x` between 1 and 10.
  - **Lines 12-13:** Fills the list `l` with integers from 1 to `x`.
  - **Lines 14-15:** If the list has only one element, it prints "No change made to list."
  - **Lines 16-18:** Prints the length of the list, the original list, and the modified list after applying the `middle()` function.

- **Line 20:** Calls the `main()` function to execute the program.
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Transcribed Image Text:```python import random def middle(l): if len(l) > 1: l = l[1:-1] return l def main(): l = [] x = random.randint(1, 10) for i in range(x): l.append(i+1) if len(l) == 1: print("No change made to list.") print("List Length =", x) print(l) print(middle(l)) main() ``` ### Explanation: - **Line 1:** The `random` module is imported to generate a random number. - **Function `middle(l):`** - **Lines 3-6:** This function takes a list `l` and checks if its length is greater than 1. If true, it returns a new list with the first and last elements removed. - **Function `main():`** - **Line 9:** Initializes an empty list `l`. - **Line 10:** Generates a random integer `x` between 1 and 10. - **Lines 12-13:** Fills the list `l` with integers from 1 to `x`. - **Lines 14-15:** If the list has only one element, it prints "No change made to list." - **Lines 16-18:** Prints the length of the list, the original list, and the modified list after applying the `middle()` function. - **Line 20:** Calls the `main()` function to execute the program.
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