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Questions and Answers
What is the result of the expression 5 / 2 in Python 3?
What is the purpose of the modulus operator % in Python?
What is the data type of the literal 3.14 in Python 3?
How can you concatenate two strings in Python 3?
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What is the result of indexing a string with 0 in Python 3?
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What is the purpose of square brackets [] in Python 3?
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What is the data type of the literal 1 in Python 3?
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What is the result of the expression 'hello' + 'world' in Python 3?
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What is the purpose of the str data type in Python 3?
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What is the purpose of the list data type in Python 3?
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Study Notes
Integers
- In Python 3, integers are whole numbers, either positive, negative, or zero.
- They are defined using the
intdata type. - Examples:
1,-5,0 - Integers can be used in arithmetic operations:
- Addition:
a + b - Subtraction:
a - b - Multiplication:
a * b - Division:
a / b(returns a float) - Modulus (remainder):
a % b
- Addition:
Floats
- In Python 3, floats are decimal numbers, either positive, negative, or zero.
- They are defined using the
floatdata type. - Examples:
3.14,-0.5,0.0 - Floats can be used in arithmetic operations:
- Addition:
a + b - Subtraction:
a - b - Multiplication:
a * b - Division:
a / b - Modulus (remainder):
a % b
- Addition:
- Floats can also be expressed in scientific notation:
1.23e-4
Strings
- In Python 3, strings are sequences of characters, such as letters, digits, or symbols.
- They are defined using the
strdata type. - Strings can be enclosed in single quotes
'hello'or double quotes"hello". - Strings can be concatenated using the
+operator:'hello' + 'world' - Strings can be indexed and sliced:
- Indexing:
my_string[0]returns the first character - Slicing:
my_string[1:4]returns a substring from index 1 to 4 (exclusive)
- Indexing:
Lists
- In Python 3, lists are ordered collections of items, such as integers, floats, or strings.
- They are defined using the
listdata type. - Lists are denoted by square brackets
[]and elements are separated by commas. - Examples:
[1, 2, 3],['a', 'b', 'c'],[1, 'hello', 3.14] - Lists can be indexed and sliced:
- Indexing:
my_list[0]returns the first element - Slicing:
my_list[1:3]returns a sublist from index 1 to 3 (exclusive)
- Indexing:
- Lists can be manipulated using methods:
-
append()adds an element to the end of the list -
insert()inserts an element at a specified position -
remove()removes the first occurrence of an element -
sort()sorts the list in ascending order
-
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Description
Learn about the basic data types in Python 3, including integers, floats, strings, and lists. Understand how to define and use them in your code.
