What does the following code do? (where f1,f2,...,fn are functions; n is a integer number)

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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### Code Explanation

**Problem Statement:**

What does the following code do? (where f1, f2, ..., fn are functions; n is an integer number)

**Code:**
```python
def comp(f, data):
    return [f(x) for x in data]

F = [f1, f2, ..., fn]
data = [x for x in range(n)]
L = [comp(f, data) for f in F]
```

**Options for Evaluation:**

1. It stores a list of lists. The ith list is generated by applying all functions to xi in the data list.
   
2. It stores a list of numbers generated by functions being applied to the data list.
   
3. There are errors in the code.
   
4. It stores a list of lists. The ith list is generated by applying fi to the data list.

**Analysis:**

- The function `comp(f, data)` takes a function `f` and a list `data`, returning a list of results by applying `f` to each element `x` in `data`.
  
- The list `F` contains functions `[f1, f2, ..., fn]`.
  
- The list `data` consists of integers `[0, 1, 2, ..., n-1]`.
  
- The list `L` is generated by applying each function `f` in `F` to the `data` list, using the `comp` function.

**Conclusion:**

- The code stores a list of lists, where each ith list is generated by applying the function `fi` to the data list.

Thus, the correct option is:
4. It stores a list of lists. The ith list is generated by applying `fi` to the data list.
Transcribed Image Text:### Code Explanation **Problem Statement:** What does the following code do? (where f1, f2, ..., fn are functions; n is an integer number) **Code:** ```python def comp(f, data): return [f(x) for x in data] F = [f1, f2, ..., fn] data = [x for x in range(n)] L = [comp(f, data) for f in F] ``` **Options for Evaluation:** 1. It stores a list of lists. The ith list is generated by applying all functions to xi in the data list. 2. It stores a list of numbers generated by functions being applied to the data list. 3. There are errors in the code. 4. It stores a list of lists. The ith list is generated by applying fi to the data list. **Analysis:** - The function `comp(f, data)` takes a function `f` and a list `data`, returning a list of results by applying `f` to each element `x` in `data`. - The list `F` contains functions `[f1, f2, ..., fn]`. - The list `data` consists of integers `[0, 1, 2, ..., n-1]`. - The list `L` is generated by applying each function `f` in `F` to the `data` list, using the `comp` function. **Conclusion:** - The code stores a list of lists, where each ith list is generated by applying the function `fi` to the data list. Thus, the correct option is: 4. It stores a list of lists. The ith list is generated by applying `fi` to the data list.
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