Function
The input() function always return a string (true/false)
Yep, this is true.
What is a variable in computing?
A variable is a container for storing data that can be changed in a program
Name a few cool things that you've done with Python
^^
Use the = operator
def my_function():
a = 50
print(a)
print('my value a is', my_function())
Is there an error in the code snippet? If yes, what is it?
my_function doesn't return a value. Instead of printing out the value, the program will print out 'None' instead.
What are some rules for naming variables in Python?
can contain both letters and numbers but not only numbers; no space in between characters; must not coincide with preserved names in Python; should make sense;...
Name 3 data types in Python
integer, float, string
How do the + and * work differently on integers and strings
1+2 = 3
1*2 = 2
'1' + '2' = '12'
'1'*2 = '11'
Name 3 Python functions that return a value and 3 that return None
Bonus: Explain what it means for a function to return a value (+100)
input(), int(), str(),...
print(), forward(), append(),...
There could be several variables in a program with the same value. (True/False)
True
What does the interpreter do?
Translate programming language codes to machine codes and execute them.
mystring = "Welcome to Python Pro Year 1. Let's learn cool new things together!"
What does mystring.find('Python') returns?
What about mystring.find('python')?
find('Python') returns 11. This is the index of the first letter in the substring
find('python') returns -1 (not found). Lower/uppercases in python matters.
num_pizza = input('Enter the number of pizzas you order')
cost = 100
total_cost = num_pizza*cost
print('the total cost of the order is', total_cost)
What will this print out?
The number that the user enters, 100 times
It is possible to declare a variable in Python without giving it an initial value. (True/False)
False. In some other programming languages, this works, but not in Python nope.
How does program differ from an algorithm?
An algorithm lists the steps for completing a goal. It needs not be written specifically in a programing languages. In order word, it's more generic.
A program is an algorithm written in a specific programming language and can be executed by the computer.
mystring ="Elon Musk just bought Twitter <OoO>"
How do we the number of characters in this string?
How can we get the substring Twitter from mystring?
len(mystring)
start_ind = mystring.find('Twitter')
if start_ind != -1:
my_string[start_ind:start_ind+7]
def my_func():
a = 100
my_func()
print(a)
What is the value of the variable a that gets printed out?
Nothing. You get an error. a is defined within the function my_func only.
def my_func():
a = 100
a = 50
my_func()
print(a)
What is the value of the variable a that gets printed out?
50
What else do want to be able to do with Python? What next in programming are you excited about learning?
^^
How do you convert an integer or float to a string and vice versa?
int(), float(), string()