What does the following code do? (where f1,f2,...,fn are functions; n is a integer number)
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
Section: Chapter Questions
Problem 1PE
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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.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F53ceecac-9f69-484a-934a-d7bcd2881f70%2F6085e652-aceb-4852-bd40-bb9dc5aee084%2F3eod2ht_processed.png&w=3840&q=75)
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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