Printing and Variables

Python runs each line top to bottom, with no disp or semicolons needed -- print() is how you show output.

Your first line

print("Hello, world!")

Variables

No type keyword needed -- Python figures out the type from the value you assign:

name = "Ada"
age = 20
gpa = 4.5

Getting input

name = input("What's your name? ")
print("Hello, " + name)

input() always returns a string, even if the student types a number -- convert it explicitly with int()/float() before doing math with it.

Comments

# This is a comment -- Python ignores everything after the #

Why This Matters for Your Exams

Python's lack of type declarations is exactly what makes it fast to write and read -- but it also means a typo'd variable name fails silently as a new variable instead of an error, which is the single most common beginner bug. Always double-check spelling.

Try it yourself

Change the name below and press Run to see Python's own output.