Python print() function: print value on screen or to file

In this tutorial, we'll learn about the print() function in Python, which is a built-in function used to display output to the console. The print() function allows you to output text, numbers, and other data types in a human-readable format.

Example 1: Basic usage of the print() function

print("Hello, world!")

This will output the text "Hello, world!" to the console.

Example 2: Printing multiple values

You can pass multiple arguments to the print() function, separated by commas. The values will be printed in the order they are provided, separated by a space.

name = "John"
age = 25
print("My name is", name, "and I am", age, "years old.")

This will output: "My name is John and I am 25 years old."

Example 3: Using a custom separator

By default, the print() function separates the arguments with a space. You can change the separator using the sep parameter.

print("apple", "banana", "cherry", sep=", ")

This will output: "apple, banana, cherry"

Example 4: Printing on a new line

By default, the print() function adds a newline character (\n) at the end of the output, which moves the cursor to the next line. You can change the end character using the end parameter.

print("Hello, world!", end=" ")
print("Welcome to Python.")

This will output: "Hello, world! Welcome to Python."

Example 5: Using formatted strings

You can use formatted strings (f-strings) to create more complex output by embedding expressions inside string literals, using curly braces {}.

name = "John"
age = 25
print(f"My name is {name} and I am {age} years old.")

This will output: "My name is John and I am 25 years old."

Example 6: Printing a list or other iterable

You can use the print() function to display the contents of a list, tuple, or other iterable.

fruits = ["apple", "banana", "cherry"]
print(fruits)

This will output: ['apple', 'banana', 'cherry']

In summary, the print() function is a built-in Python function that allows you to display output to the console in a human-readable format. You can print multiple values, use custom separators and end characters, and format your output using formatted strings (f-strings) or other formatting techniques. The print() function is essential for providing feedback and displaying the results of your code.

How to Use print() to Display Values in Python:
- The print() function is used to display values in Python.
```
# Example
message = "Hello, World!"
print(message)
```
Printing to the Screen with print() in Python:
- The most common use of print() is to output information to the console.
```
# Example
print("This is a message.")
```
Redirecting Output to a File with print() in Python:
- Redirect the output of print() to a file using the file parameter.
```
# Example
with open("output.txt", "w") as file:
    print("Output to a file", file=file)
```
Formatting Output with the print() Function in Python:
- Format the output using different print parameters.
```
# Example
name = "Alice"
age = 30
print("Name:", name, "Age:", age)
```
Print to a File Instead of the Console in Python:
- Redirect print() output to a file instead of the console.
```
# Example
with open("output.txt", "w") as file:
    print("Print to a file", file=file)
```
Customizing print() Output in Python:
- Customize the print() output by adjusting the separator and end characters.
```
# Example
print("Custom", "output", sep="-", end="!\n")
```

Logging with print() in Python:

Use print() for basic logging purposes.

# Example
log_message = "Log this message"
print("LOG:", log_message)

Print to a Specific File in Python:
- Direct print() output to a specific file using the file parameter.
```
# Example
with open("log.txt", "a") as log_file:
    print("Log this message", file=log_file)
```
Advanced Usage of print() for Debugging in Python:
- Utilize print() for debugging by including variable values in the output.
```
# Example
variable = 42
print("Debug: Variable =", variable)
```