***

### 🧩 **Problem 1: Read and Display File Content**

**Description:**
Write a Python program to open a text file named `info.txt` and display its contents.
If the file does not exist, display a custom message like “File not found.”

**Solution:**

```
try:
    file = open("info.txt", "r")
    content = file.read()
    print(content)
    file.close()
except FileNotFoundError:
    print("File not found. Please check the filename.")

```

**Explanation:**
The program attempts to open `info.txt` in read mode.
If it doesn’t exist, Python raises a `FileNotFoundError`, which we catch and handle gracefully.

***

### 🧩 **Problem 2: Write User Input to a File**

**Description:**
Ask the user to input a few lines of text and write them to a file called `user_notes.txt`.

**Solution:**

```
file = open("user_notes.txt", "w")
while True:
    line = input("Enter text (or 'exit' to stop): ")
    if line.lower() == 'exit':
        break
    file.write(line + "\n")
file.close()
print("Data successfully written to user_notes.txt")

```

**Explanation:**
The program takes multiple lines from the user and writes each to a file.
It stops when the user types `'exit'`.

***

### 🧩 **Problem 3: Append Data to a File**

**Description:**
Append a new line `"New data added successfully."` to an existing file `log.txt`.
If the file doesn’t exist, create it.

**Solution:**

```
file = open("log.txt", "a")
file.write("\nNew data added successfully.")
file.close()
print("Data appended successfully.")

```

**Explanation:**
Using append mode `"a"`, data is added to the end of the file without overwriting it.
If the file doesn’t exist, Python automatically creates it.

***

### 🧩 **Problem 4: Count Number of Lines in a File**

**Description:**
Count and display the total number of lines in `data.txt`.

**Solution:**

```
try:
    count = 0
    with open("data.txt", "r") as file:
        for line in file:
            count += 1
    print("Total number of lines:", count)
except FileNotFoundError:
    print("File not found.")

```

**Explanation:**
Each iteration over the file counts one line.
Using `with` ensures the file is closed automatically.

***

### 🧩 **Problem 5: Copy Content from One File to Another**

**Description:**
Copy all content from `source.txt` to `destination.txt`.
Handle the error if the source file doesn’t exist.

**Solution:**

```
try:
    with open("source.txt", "r") as src:
        data = src.read()
    with open("destination.txt", "w") as dest:
        dest.write(data)
    print("File copied successfully!")
except FileNotFoundError:
    print("source.txt not found.")

```

**Explanation:**
The `with` statement handles both reading and writing safely.
If `source.txt` doesn’t exist, the program prints an error instead of crashing.

***

### 🧩 **Problem 6: Count Words in a File**

**Description:**
Count the total number of words in `story.txt`.

**Solution:**

```
try:
    with open("story.txt", "r") as file:
        text = file.read()
        words = text.split()
        print("Total words:", len(words))
except FileNotFoundError:
    print("File not found.")

```

**Explanation:**
`split()` divides the text into words by whitespace.
We count them using `len()`.

***

### 🧩 **Problem 7: Read File Using `with` Statement**

**Description:**
Use the `with` statement to read `example.txt` line by line.

**Solution:**

```
with open("example.txt", "r") as file:
    for line in file:
        print(line.strip())

```

**Explanation:**
The `with` statement automatically closes the file.
`strip()` removes newline characters for clean output.

***

### 🧩 **Problem 8: Handle Division Error from File Input**

**Description:**
You have a file `numbers.txt` containing two numbers (one per line).
Read them and divide the first by the second.
Handle division by zero properly.

**Solution:**

```
try:
    with open("numbers.txt", "r") as file:
        num1 = int(file.readline())
        num2 = int(file.readline())
        print("Result:", num1 / num2)
except FileNotFoundError:
    print("numbers.txt not found.")
except ZeroDivisionError:
    print("Cannot divide by zero.")

```

**Explanation:**
We read two integers from the file.
If the second number is zero, we catch the `ZeroDivisionError`.

***

###

Write a Python program to open a text file named 

If the file does not exist, display a custom message like “File not found.”

try:
    file = open("info.txt", "r")
    content = file.read()
    print(content)
    file.close()
except FileNotFoundError:
    print("File not found. Please check the filename.")


Ask the user to input a few lines of text and write them to a file called 

file = open("user_notes.txt", "w")
while True:
    line = input("Enter text (or 'exit' to stop): ")
    if line.lower() == 'exit':
        break
    file.write(line + "\n")
file.close()
print("Data successfully written to user_notes.txt")


The program takes multiple lines from the user and writes each to a file.

file = open("log.txt", "a")
file.write("\nNew data added successfully.")
file.close()
print("Data appended successfully.")


, data is added to the end of the file without overwriting it.

If the file doesn’t exist, Python automatically creates it.

Problem 4: Count Number of Lines in a File

Count and display the total number of lines in 

try:
    count = 0
    with open("data.txt", "r") as file:
        for line in file:
            count += 1
    print("Total number of lines:", count)
except FileNotFoundError:
    print("File not found.")


Each iteration over the file counts one line.

 ensures the file is closed automatically.

Problem 5: Copy Content from One File to Another

Handle the error if the source file doesn’t exist.

try:
    with open("source.txt", "r") as src:
        data = src.read()
    with open("destination.txt", "w") as dest:
        dest.write(data)
    print("File copied successfully!")
except FileNotFoundError:
    print("source.txt not found.")


 statement handles both reading and writing safely.

 doesn’t exist, the program prints an error instead of crashing.

try:
    with open("story.txt", "r") as file:
        text = file.read()
        words = text.split()
        print("Total words:", len(words))
except FileNotFoundError:
    print("File not found.")


 divides the text into words by whitespace.

with open("example.txt", "r") as file:
    for line in file:
        print(line.strip())


 statement automatically closes the file.

 removes newline characters for clean output.

Problem 8: Handle Division Error from File Input

Read them and divide the first by the second.

try:
    with open("numbers.txt", "r") as file:
        num1 = int(file.readline())
        num2 = int(file.readline())
        print("Result:", num1 / num2)
except FileNotFoundError:
    print("numbers.txt not found.")
except ZeroDivisionError:
    print("Cannot divide by zero.")


If the second number is zero, we catch the 