Python tutorial part 1
Understanding Variables
We'll start by talking about variables. In programming, a variable is a named location used to
store data in memory. It is called a variable because its value can vary throughout the execution
of a program. Variables must be given unique names, called identifiers. In Python, variable
names are case sensitive and cannot start with a number. They can contain letters, numbers,
and underscores.
For example, let's say we want to store the number of apples I have in a variable named apples.
We can do this with the following code:
apples = 5
Now, apples is a variable that stores the value 5. We can use this variable in calculations, such as
adding more apples:
apples = apples + 3
print(apples)
This will output 8, because we added 3 to the value stored in the apples variable.
Next, let's talk about data types. A data type is an attribute that tells what kind of data a
particular variable can hold. There are several basic data types in Python, including int, float, str,
and bool.
int is short for integer, which is a whole number, positive or negative, without decimals. For
example:
num_apples = 10
num_oranges = -5
float is short for floating point number, which is a number with decimals. For example:
price_per_apple = 0.5
price_per_orange = 0.35
str is short for string, which is a sequence of characters surrounded by quotes. Strings can be
enclosed in either single quotes or double quotes. For example:
name = "Alice"
greeting = 'Hello, world!'
, bool is short for boolean, which is a logical value that can be either True or False. For example:
is_hungry = True
is_tired = False
We can also use data types to perform type conversions, such as converting a string to an
integer:
age_str = "25"
age_int = int(age_str)
print(type(age_int))
This will output <class 'int'>, because we converted the string "25" to an integer using the int()
function.
In conclusion, variables and data types are fundamental concepts in programming that allow us
to store and manipulate data. By understanding how to use variables and data types in Python,
we can create more complex and powerful programs.
That's it for this chapter on Variables and Data Types! I hope this summary has been helpful in
explaining these concepts and providing examples from the video. Thank you for reading.
Conditional Statements and Boolean
Values in Code
Concept: Allows the program to make decisions based on certain conditions.
** Keywords:** if, elif, else
Boolean Values: True or False
Variables and Data Types
Variables: Used to store data and values.
Data Types: Integers, Floats, Strings, Lists, Tuples, Dictionaries.
Working with Classes and Objects
Understanding Variables
We'll start by talking about variables. In programming, a variable is a named location used to
store data in memory. It is called a variable because its value can vary throughout the execution
of a program. Variables must be given unique names, called identifiers. In Python, variable
names are case sensitive and cannot start with a number. They can contain letters, numbers,
and underscores.
For example, let's say we want to store the number of apples I have in a variable named apples.
We can do this with the following code:
apples = 5
Now, apples is a variable that stores the value 5. We can use this variable in calculations, such as
adding more apples:
apples = apples + 3
print(apples)
This will output 8, because we added 3 to the value stored in the apples variable.
Next, let's talk about data types. A data type is an attribute that tells what kind of data a
particular variable can hold. There are several basic data types in Python, including int, float, str,
and bool.
int is short for integer, which is a whole number, positive or negative, without decimals. For
example:
num_apples = 10
num_oranges = -5
float is short for floating point number, which is a number with decimals. For example:
price_per_apple = 0.5
price_per_orange = 0.35
str is short for string, which is a sequence of characters surrounded by quotes. Strings can be
enclosed in either single quotes or double quotes. For example:
name = "Alice"
greeting = 'Hello, world!'
, bool is short for boolean, which is a logical value that can be either True or False. For example:
is_hungry = True
is_tired = False
We can also use data types to perform type conversions, such as converting a string to an
integer:
age_str = "25"
age_int = int(age_str)
print(type(age_int))
This will output <class 'int'>, because we converted the string "25" to an integer using the int()
function.
In conclusion, variables and data types are fundamental concepts in programming that allow us
to store and manipulate data. By understanding how to use variables and data types in Python,
we can create more complex and powerful programs.
That's it for this chapter on Variables and Data Types! I hope this summary has been helpful in
explaining these concepts and providing examples from the video. Thank you for reading.
Conditional Statements and Boolean
Values in Code
Concept: Allows the program to make decisions based on certain conditions.
** Keywords:** if, elif, else
Boolean Values: True or False
Variables and Data Types
Variables: Used to store data and values.
Data Types: Integers, Floats, Strings, Lists, Tuples, Dictionaries.
Working with Classes and Objects
