Práctica 8: Archivos

Objectives

During this activity, students should be able to:

Write programs using the Python programming language in order to solve problems that involve files.

This activity helps students develop the following skills, values and attitudes: proficiency in English, ability to analyze and synthesize, capacity to identify and solve problems, and efficient use of computer systems.

Activity Description

Individually or in pairs, solve the following set of problems using Python 3.5. Run and test each of your programs to make sure they work as expected.

Each source file must include at the top the authors’ personal information (student ID and name) within comments. For example:

# Authors: 
#          A01166611 Pepper Pots
#          A01160611 Anthony Stark
#
# Description of problem being solved.
#
# November 4, 2016.

    .
    . (The rest of the program goes here)
    .

Write a program called wordcount.py. Define in this program a function called wordcount(infile) that takes a string with the name of an input file infile and returns the number of lines, number of words, and number of characters in the ﬁle.

To test your program, create a file called crocodile.txt with the following content:
```
HOW DOTH THE LITTLE CROCODILE
Lewis Carroll

How doth the little crocodile
Improve his shining tail,
And pour the waters of the Nile
On every golden scale!

How cheerfully he seems to grin,
How neatly spread his claws,
And welcome little fishes in
With gently smiling jaws!
```
Add the following main() function to your program:
```
def main():
    print(wordcount('crocodile.txt'))
```
The expected output after running the program should be:
```
(12, 47, 274)
```
This is because the file crocodile.txt has 12 lines, 47 words, and 274 characters. NOTE: These numbers may vary slightly depending of the operating system being used.
Write a program called addints.py. Define in this program a function called addints(infile) that takes one argument: a string with the name of the input file infile that contains a sequence of integer numbers, each number in its own line. The function should return the result of adding all these integers together.

To test your program, create a file called numbers.txt with the following content:
```
4
8
15
16
23
42
```
Add the following main() function to your program:
```
def main():
    print(addints('numbers.txt'))
```
The expected output after running the program should be:
```
108
```

Write a program called reverse.py. Define in this program a function called reverse(infile, outfile) that takes two arguments: a string with the name of the input file infile and a string with the name of the output file outfile. The function should write in outfile each of the lines contained in infile but in reversed order. The function should return nothing.

To test your program, create a file called speak.txt with the following content:

SPEAK ROUGHLY
Lewis Carroll

Speak roughly to your little boy,
And beat him when he sneezes:
He only does it to annoy,
Because he knows it teases.

Chorus
Wow! wow! wow!

I speak severely to my boy,
I beat him when he sneezes;
For he can thoroughly enjoy
The pepper when he pleases!

Add the following main() function to your program:

def main():
    reverse('speak.txt', 'speak_reverse.txt')

After running your program, the contents of the file speak_reverse.txt should be:

The pepper when he pleases!
For he can thoroughly enjoy
I beat him when he sneezes;
I speak severely to my boy,

Wow! wow! wow!
Chorus

Because he knows it teases.
He only does it to annoy,
And beat him when he sneezes:
Speak roughly to your little boy,

Lewis Carroll
SPEAK ROUGHLY

Write a program called linenum.py. Define in this program a function called linenum(infile, outfile) that takes two arguments: a string with the name of the input file infile and a string with the name of the output file outfile. The function should write in outfile each of the lines contained in infile but adding the line number along the left edge. The function should return nothing.

To test your program, create a file called bat.txt with the following content:
```
THE BAT
Lewis Carroll

Twinkle, twinkle, little bat
How I wonder what you're at!
Up above the world you fly
Like a tea-tray in the sky.
```
Add the following main() function to your program:
```
def main():
    linenum('bat.txt', 'bat_linenum.txt')
```
After running your program, the contents of the file bat_linenum.txt should be:
```
1: THE BAT
2: Lewis Carroll
3: 
4: Twinkle, twinkle, little bat
5: How I wonder what you're at!
6: Up above the world you fly
7: Like a tea-tray in the sky.
```

Deliverables

Create a ZIP file called files.zip containing only the four programs you wrote (wordcount.py, addints.py, reverse.py and linenum.py).

✔ Upload Instructions

To deliver the files.zip file, please provide the following information:

Request PIN

If this activity was developed by a team of two people, only one person is required to deliver it. No activity will be accepted through e-mail or any other means.

Due date is Friday, November 4.

Evaluation

This activity will be evaluated using the following criteria:

-10	One or more programs don’t contain within comments the authors’ personal information.
DA	One or more programs were plagiarized.
10-100	Depending on the amount of problems that were solved correctly.

Fundamentos de programación