input() always returns text, even when the user types digits.
Use conversion functions such as int() or float() only after deciding what kind of value the program needs.
Good beginner input code explains what to type, validates the answer, and prints results in a readable format.
The print() function outputs text to the console. It's the most basic way to display information.
print("Hello, World!")
print(42)
print("Name:", "Alice", "Age:", 25)
print("a", "b", "c", sep="-")
print("a", "b", "c", sep="")
print("Hello", end=" ")
print("World")
with open("log.txt", "w", encoding="utf-8") as file:
print("Log entry", file=file)The input() function reads a line from the user. It always returns a string - convert it if you need a number.
# Basic input
name = input("Enter your name: ")
print(f"Hello, {name}!")
# input() always returns a string - convert as needed
age_str = input("Enter your age: ")
age = int(age_str)
print(f"In 10 years you'll be {age + 10}")
# One-liner conversion
height = float(input("Enter your height in meters: "))
# Multiple inputs on one line
x, y = input("Enter two numbers separated by space: ").split()
x, y = int(x), int(y)
print(f"Sum: {x + y}")
# Read a list of numbers
numbers = list(map(int, input("Enter numbers: ").split()))
print(f"Sum: {sum(numbers)}")
print(f"Max: {max(numbers)}")# Keep asking until valid input
def get_int(prompt: str) -> int:
while True:
try:
return int(input(prompt))
except ValueError:
print("Please enter a valid integer.")
age = get_int("Enter your age: ")
print(f"Age: {age}")
# Validate within a range
def get_score() -> int:
while True:
try:
score = int(input("Enter score (0-100): "))
if 0 <= score <= 100:
return score
print("Score must be between 0 and 100.")
except ValueError:
print("Please enter a number.")
# Yes/No prompt
def ask_yes_no(question: str) -> bool:
while True:
answer = input(f"{question} (y/n): ").strip().lower()
if answer in ("y", "yes"):
return True
if answer in ("n", "no"):
return False
print("Please enter y or n.")
if ask_yes_no("Continue-"):
print("Continuing...")students = [
("Alice", 20, 95.5),
("Bob", 22, 87.0),
("Charlie", 21, 92.3),
]
print(f"{'Name':<10} {'Age':>4} {'Score':>7}")
print("-" * 25)
for name, age, score in students:
print(f"{name:<10} {age:>4} {score:>7.1f}")
for step in range(1, 6):
print(f"\rProgress: {step}/5", end="", flush=True)
print()0 of 2 checked
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Keyboard input arrives as text. Python waits for you to decide whether that text should become an int, float, date, or another type.
Validate first or use a focused try except around the conversion. Then show a clear message and ask again if needed.
No. Many functions should return data, while the main program decides how to print or display it.
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