Es. Python tutorial - Lavorare con i file

Es. Python tutorial - Lavorare con i file

Versione italiana

Esercizi

1. Creazione e Scrittura in un File

Crea un file chiamato test.txt e scrivi dentro la frase: "Hello, world!".

2. Lettura di un File

Leggi il contenuto del file test.txt e stampalo a schermo.

3. Aggiunta di Testo a un File

Apri il file test.txt in modalità append e aggiungi la frase: "Python è fantastico!".

4. Lettura Righe Singole da un File

Leggi il file test.txt riga per riga e stampale una alla volta.

5. Uso di with open

Apri e leggi il contenuto di test.txt utilizzando la gestione contestuale with open().

6. Copia di un File

Crea una copia del file test.txt in un nuovo file copy.txt.

7. Contare le Parole in un File

Leggi il file test.txt e conta quante parole contiene.

8. Eliminare un File

Scrivi un programma che elimini test.txt se esiste.

9. Ricerca di una Parola in un File

Chiedi all’utente di inserire una parola e verifica se è presente in test.txt.

10. Scrittura di una Lista in un File

Dati i seguenti nomi in una lista ["Alice", "Bob", "Charlie"], scrivili in un file names.txt, un nome per riga.

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Soluzioni

# 1. Creazione e Scrittura in un File
with open("test.txt", "w") as file:
    file.write("Hello, world!")

# 2. Lettura di un File
with open("test.txt", "r") as file:
    content = file.read()
print(content)  # Output: Hello, world!

# 3. Aggiunta di Testo a un File
with open("test.txt", "a") as file:
    file.write("\nPython è fantastico!")

# 4. Lettura Righe Singole da un File
with open("test.txt", "r") as file:
    for line in file:
        print(line.strip())  # Output: stampa ogni riga senza spazi extra

# 5. Uso di `with open`
with open("test.txt", "r") as file:
    content = file.read()
print(content)  # Output: Hello, world!\nPython è fantastico!

# 6. Copia di un File
with open("test.txt", "r") as original, open("copy.txt", "w") as copy:
    copy.write(original.read())

# 7. Contare le Parole in un File
with open("test.txt", "r") as file:
    words = file.read().split()
print(len(words))  # Output: Numero di parole nel file

# 8. Eliminare un File
import os
if os.path.exists("test.txt"):
    os.remove("test.txt")

# 9. Ricerca di una Parola in un File
word_to_find = input("Inserisci una parola: ")
with open("test.txt", "r") as file:
    content = file.read()
if word_to_find in content:
    print("La parola è presente nel file.")
else:
    print("La parola non è presente nel file.")

# 10. Scrittura di una Lista in un File
names = ["Alice", "Bob", "Charlie"]
with open("names.txt", "w") as file:
    for name in names:
        file.write(name + "\n")

English version

Exercises

1. Creating and Writing to a File

Create a file called test.txt and write the sentence: "Hello, world!" into it.

2. Reading a File

Read the contents of the file test.txt and print it to the screen.

3. Appending Text to a File

Open the file test.txt in append mode and add the sentence: "Python is awesome!".

4. Reading Single Lines from a File

Read the file test.txt line by line and print them one at a time.

5. Using with open

Open and read the contents of test.txt using the context handler with open().

6. Copying a File

Create a copy of the file test.txt in a new file copy.txt.

7. Count Words in a File

Read the file test.txt and count how many words it contains.

8. Delete a File

Write a program that deletes test.txt if it exists.

9. Search for a Word in a File

Ask the user to enter a word and see if it is present in test.txt.

10. Write a List to a File

Given the following names in a list ["Alice", "Bob", "Charlie"], write them to a file names.txt, one name per line.

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Solutions

#1. Creating and Writing to a File
with open("test.txt", "w") as file:
 file.write("Hello, world!")

#2. Reading a File
with open("test.txt", "r") as file:
 content = file.read()
print(content) # Output: Hello, world!

# 3. Adding Text to a File
with open("test.txt", "a") as file:
file.write("\nPython is awesome!")

# 4. Reading Single Lines from a File
with open("test.txt", "r") as file:
for line in file:
print(line.strip()) # Output: Print each line without extra spaces

# 5. Using `with open`
with open("test.txt", "r") as file:
content = file.read()
print(content) # Output: Hello, world!\nPython is awesome!

#6. Copy a File
with open("test.txt", "r") as original, open("copy.txt", "w") as copy:
 copy.write(original.read())

#7. Count the Words in a File
with open("test.txt", "r") as file:
 words = file.read().split()
print(len(words)) # Output: Number of words in the file

#8. Delete a File
import os
if os.path.exists("test.txt"):
 os.remove("test.txt")

#9. Search for a Word in a File
word_to_find = input("Enter a word: ")
with open("test.txt", "r") as file:
 content = file.read()
if word_to_find in content:
 print("The word is present in the file.")
else:
 print("The word is not present in the file.")

# 10. Writing a List to a File
names = ["Alice", "Bob", "Charlie"]
with open("names.txt", "w") as file:
 for name in names:
 file.write(name + "\n")