1. Welcome
Avilay Parekh
Anika Parekh
@avilay

2. Datatypes cannot be mixed
age = 30
print(name + “is” + age + “years old”)
Ka-Boom!!

3. Datatypes cannot be mixed
age = 30
print(name + “is” + str(age) + “years
old”)
Convert the number to a string using the str
function

4. Datatypes cannot be mixed
age = “30”
print(name + “ is ” + age + “ years old ”)
Or just declare the variable age as a string.

5. Datatypes cannot be mixed
your_age = input(“Your age?”)
my_age = 30
older_by = my_age – your_age
Ka-Boom!!

6. Datatypes cannot be mixed
your_age = int(input(“Your age?”))
my_age = 30
older_by = my_age – your_age
input function always returns a string. Convert
it to a number using the int (for integer)
function.

7. Dragon Game - Choice
import random
:::
good_cave = random.randint(1, 2)
print(“Which cave will you go into? (1 or 2)”)
chosen_cave = int(input())

8. Boolean
Can only take on one of two values –
True or False
is_programming_fun = True
is_cold = False
print(is_cold)

9. Boolean
Is my age same as yours?
The == operator checks if the values are equal
my_age = 30
your_age = ?
print(my_age == your_age)

10. Boolean
my_age = 30
your_age = ?
print(my_age = your_age)
Sneaky Bug!

11. Boolean
Am I older than you?
The > operator checks if LHS is greater than
RHS
my_age = 30
your_age = ?
am_i_older = my_age > your_age
print(am_i_older)

12. Boolean
money = 500
phone_cost = 240
tablet_cost = 200
total_cost = phone_cost + tablet_cost
can_afford_both = money > total_cost
print(can_afford_both)

13. Conditionals
if always checks a Boolean variable for True
Has to be a Boolean
variable
if can_afford_both:
message = “You can afford both.”
else:
message = “You cannot afford both.”

14. Conditionals
your_age = int(input(“Your age?”))
my_age = 30
older_by = -1
if my_age > your_age:
older_by = my_age – your_age
elif my_age < your_age:
older_by = your_age – my_age
else:
older_by = 0
?

15. Dragon Game - Result
import time
:::
print("You approach the cave...");
time.sleep(2)
print("It is dark and spooky...")
time.sleep(2)
print("A large dragon jumps out in front of you! He opens his jaws
and...")
print()
time.sleep(2)
if chosen_cave == good_cave:
print("Gives you his treasure")
else:
print("Gobbles you down in one bite!")

16. Loops
ctr = 0
while (ctr < 5):
print(“This is line ” + ctr)
ctr = ctr + 1

17. Loops
while (True):
print(“Stop this train, I wanna
get off!”)
print(“Oh! Thank goodness!”)

18. Dragon Game - play
import random
import time
play_again = "yes"
while (play_again == "yes"):
print("you are in a land full of dragons…")
::::
else:
print("Gobbles you down in one bite!")
play_again = input("Do you want to play again? (yes
or no)")

19. Sing and Talk
$ mpg123 /home/pi/viva.mp3 &
$ espeak “hello there”
>>> import os
>>> os.system(‘mpg123 /home/pi/viva.mp3 &’)
>>> os.system(‘espeak “hello there”’)

20. Conditionals
Loops
Making the Pi
sing and talk
Module 3