Summary - Input and output

Combine input, conversion and formatting to write an interactive menu.

Summary - Input and output

In this group you learned four core tools:

input() — reads a string from the user
int() / float() — convert a string to a number
print() sep/end — format the output
f-string — embeds an expression in a string
sys.argv — gives command-line arguments

Now you will do two short tasks that combine them: one with interactive input, one with a command-line argument.

Exercise Interactive age calculator

Assign input("Ad: ") to name (user types Ayşe). Assign int(input("Yaş: ")) to age (user types 30). Then write print(f"{name} gelecek yıl {age + 1} yaşında").

Show example solution

name = input("Ad: ")
age = int(input("Yaş: "))
print(f"{name} gelecek yıl {age + 1} yaşında")

Exercise Print double with sys.argv

Write import sys. Assign sys.argv[1] if len(sys.argv) > 1 else "5" to val. Assign int(val) to num. Then write print(num * 2). The script runs with no arguments.

Show example solution

import sys
val = sys.argv[1] if len(sys.argv) > 1 else "5"
num = int(val)
print(num * 2)

Test yourself

How are input() and int() used together?
- int(input(...))
- int.input(...)
- input(int(...))
- input->int(...)
Show answer

int(input(...)) — int(input(...)) works outside-in: first input is read, then converted.

Complete the print sep

print("a", "b", "c", sep=____)

Show answer

print("a", "b", "c", sep=",")

Next lesson: try/except

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