רצף תוכנית פייתון (Control Flow)

# if Statement
test_value = 100

if test_value > 1:
  # Expression evaluates to True
  print("This code is executed!")

if test_value > 1000:
  # Expression evaluates to False
  print("This code is NOT executed!")

print("Program continues at this point.")

# else Statement
test_value = 50

if test_value < 1:
  print("Value is < 1")
else:
  print("Value is >= 1")

test_string = "VALID"

if test_string == "NOT_VALID":
  print("String equals NOT_VALID")
else:
  print("String equals something else!")

# elif Statement
pet_type = "fish"

if pet_type == "dog":
  print("You have a dog.")
elif pet_type == "cat":
  print("You have a cat.")
elif pet_type == "fish":
  # this is performed
  print("You have a fish")
else:
  print("Not sure!")

grades = [65, 83, 75, 100, 57, 90]
if 100 in grades:
  print('We have found a perfect score')

todo_list = ['start project proposal', 'review the proposal with Team Lead', 'continue working on the proposal', 'present the proposal']
for todo in todo_list:
  print('Things to do today: ', todo)

james_cameron_movies = ["Titanic", "Avatar", "The Terminator", "Aliens"]
for movie in james_cameron_movies:
  print(movie)

# Output:
Titanic
Avatar
The Terminator
Aliens

# Print "WARNING" 3 times:
for i in range(3):
  print("WARNING")

for num in range(1, 11, 1):
  if num % 2 == 0:
    print('Num ', num, ' is even')
  elif num % 2 != 0:
    print('Num ', num, ' is odd')

big_number_list = [1, 2, -1, 4, -5, 5, 2, -9]

# Print only positive numbers:
for i in big_number_list:
  if i < 0:
    continue
  print(i)

# A string is a list, each character is an item on the list
greeting = "hello"
for index, character in enumerate(greeting):
  print(character, ' is located at index ', index, ' in string ', greeting)

james_cameron_movies = ["Titanic", "Avatar", "The Terminator", "Aliens"]
for index, movie in enumerate(james_cameron_movies, 1):
  print(movie, ' is located at index ', index, ' in list ', james_cameron_movies)

groups = [["Jobs", "Gates"], ["Newton", "Euclid"], ["Einstein", "Feynman"]]

# This outer loop will iterate over each list in the groups list
for group in groups:
  # This inner loop will go through each name in each list
  for name in group:
    print(name)

# Starting with 1 the initial_value will change in the loop
# The loop will run 10 times.
initial_value = 1
while initial_value <= 10:
  print('initial value is: ', initial_value)
  initial_value = initial_value + 1

# This loop will only run 1 time
hungry = True
while hungry:
  print("Time to eat!")
  hungry = False