# Let us start with indentation.
# Python uses spaces to show which code is inside what.
for i in range(3):
    print("Hello!")

# Bad example (do not copy):
# for i in range(3):
# print("Hello!")

# PEP 8 recommends using 4 spaces for each indentation level.
if True:
    print("This line is indented with exactly 4 spaces.")
    

# Let us talk about blank lines.
# Blank lines help separate sections of your code.
def greet():
    print("Hello!")

def bye():
    print("Goodbye!")
    

# Variable and function names should be descriptive.
# Use lower_case_with_underscores by PEP 8.
favorite_color = "blue"
def print_color(color):
    print("Favorite color:", color)

print_color(favorite_color)

# Avoid single-letter names except for short loops.
x = 12   # Not clear
age_in_years = 12  # Better and clear

# Comments explain why, not just what.
height_cm = 170  # height in centimeters
# Calculate height in meters
height_m = height_cm / 100
print("Height in meters:", height_m)

# Spaces make math easier to see.
# Always put spaces around operators.
a = 5+3*2    # Not clear
b = 5 + 3 * 2  # Better
print("a:", a)
print("b:", b)

# Let us use input to get your favorite snack.
snack = input("What is your favorite snack? ")
print("Yum!", snack, "sounds delicious.")

# Constants should be in ALL_CAPS.
PI = 3.14159
radius = 2
area = PI * radius ** 2
print("Circle area:", area)

# Use good spacing in lists and dictionaries.
colors = ["red", "green", "blue"]
person = {"name": "Eva", "age": 29}
print("Colors:", colors)
print("Person:", person)

# Use two blank lines before top-level functions and classes.

def multiply(x, y):
    return x * y

print(multiply(3, 4))

# Inline comments should be clear and at least two spaces from code.
width = 50  # width in centimeters
length = 100  # length in centimeters
area_cm = width * length  # Calculate area in cm squared
print("Total area in cm squared:", area_cm)

# Step 1: Set up player names and starting scores.
player_one = input("Player 1 name: ")
player_two = input("Player 2 name: ")

score_one = 0
score_two = 0

# Step 2: Enter scores and print who is winning.
score_one = int(input("Points for " + player_one + ": "))
score_two = int(input("Points for " + player_two + ": "))
if score_one > score_two:
    print(player_one, "is winning!")
elif score_two > score_one:
    print(player_two, "is winning!")
else:
    print("It is a tie!")
    

# Troubleshooting tip: Watch out for indentation errors.
for n in range(2):
    print("Good indentation!")
# print("This will cause an error") # This line should be indented.

# Extra tip: Tools like black or autopep8 can help format your code.
# They rewrite your code to match PEP 8 automatically.
print("Try using code formatters for big projects!")