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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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Looking for python guidance for the code comments.

Write a program that replaces words in a sentence. The input begins with word replacement pairs (original and replacement). The next line of input is the sentence where any word on the original list is replaced.

Ex: If the input is:

automobile car manufacturer maker children kids The automobile manufacturer recommends car seats for children if the automobile doesn't already have one.

the output is:

The car maker recommends car seats for kids if the car doesn't already have one.

Looking for python guidance for the code comments.

# Programming Lab: Word Replacement in Sentences

## Task Description
Write a program that replaces words in a sentence. The input begins with word replacement pairs (original and replacement words). The second line of input is the sentence where any word on the original list is replaced.

### Example
**Input:**
```
automobile car manufacturer maker children kids
The automobile manufacturer recommends car seats for children if the automobile doesn't already have one.
```

**Output:**
```
The car maker recommends car seats for kids if the car doesn't already have one.
```

*Note:* You can assume the original words are unique.

## Code Explanation

```python
replacement_words = input().split()
line = input()

for i in range(0, len(replacement_words), 2):
if replacement_words[i] in line:
line = line.replace(replacement_words[i], replacement_words[i + 1])
print(line)
```

### Code Breakdown

1. **Input and Setup:**
- The program reads the first line of input, which contains the word replacement pairs, and splits them into a list called `replacement_words`.
- The next line of input is the sentence to be processed, stored in the variable `line`.

2. **Replacement Loop:**
- A `for` loop is used to iterate over the list `replacement_words` in steps of 2 (since each pair consists of an original word and its replacement).
- For each pair `(replacement_words[i], replacement_words[i + 1])`, the program checks if the original word exists in the sentence `line`.
- If so, the sentence is updated with the replacement word using the `replace()` method.

3. **Output:**
- The modified sentence is printed as output.

This simple yet effective program efficiently updates a sentence based on provided word pairs.

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