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Input and Output

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Input

Python provides the input() function to take input from the user. By default, it returns a string.

Python

name = input("Enter your name: ")
print("Hello,", name)

Important Note: The input is always a string. To convert it to a number, use int() or float().

Python

age = int(input("Enter your age: "))
print("You are", age, "years old.")

Output

The print() function is used to display output to the console. It can handle various data types.

Python

name = "Alice"
age = 30
print("Name:", name, "Age:", age)

Formatting Output:

  • f-strings: For formatted output with embedded expressions.Pythonname = "Alice" age = 30 print(f"Hello, {name}. You are {age} years old.")
  • str.format() method: For more complex formatting.Pythonprint("Hello, {}. You are {} years old.".format(name, age))

Additional Considerations

  • File Input/Output: For handling data from files, use functions like open(), read(), write(), and close().
  • Error Handling: Use try-except blocks to handle potential errors during input/output operations.

How do I take user input in Python?

Use the input() function to get user input as a string.

How do I display output in Python?

Use the print() function to display output to the console.

What is the default data type of input from the user?

It’s a string. You need to convert it to other data types (int, float) if necessary.

Can I format the output using print()?

Yes, use f-strings or the format() method for formatted output.

What happens if the user enters invalid input?

The program might crash. Use try-except blocks to handle potential errors.

Can I read data from a file?

Yes, use the open() function to open a file and read its contents.

Can I write data to a file?

Yes, use the open() function with the 'w' mode to write data to a file.

Can I validate user input?

Yes, use conditional statements and error handling (try-except) to check for valid input.

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