Cheatography
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Different types of Number data types
This is a draft cheat sheet. It is a work in progress and is not finished yet.
Boolean data type in Python
Boolean type is one of the built-in data types provided by Python, which represents one of the two values i.e. True or False.
Generally, it is used to represent the truth values of the expressions. For example, 1==1 is True whereas 2<1 is False. |
Python Boolean Type
The output <class ‘bool’> indicates the variable is a boolean data type. |
Example: Boolean type
a = True
type(a)
b = False
type(b)
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Output:
<class 'bool'>
<class 'bool'>
Evaluate Variables and Expressions
We can evaluate values and variables using the Python bool() function. This method is used to return or convert a value to a Boolean value i.e., True or False, using the standard truth testing procedure. |
Example: Python bool() method
# Returns False as x is not equal to y
x = 5
y = 10
print(bool(x==y))
# Returns False as x is None
x = None
print(bool(x))
# Returns False as x is an empty sequence
x = ()
print(bool(x))
# Returns False as x is an empty mapping
x = {}
print(bool(x))
# Returns False as x is 0
x = 0.0
print(bool(x))
# Returns True as x is a non empty string
x = 'GeeksforGeeks'
print(bool(x))
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Output
False
False
False
False
False
True
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Integers and Floats as Booleans
Numbers have zero as a value is considered
as False, while if they are having value as any
positive or negative number then it is considered
as True.
var1 = 0
print(bool(var1))
var2 = 1
print(bool(var2))
var3 = -9.7
print(bool(var3))
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Int type
int (Integers) are the whole number, including negative numbers but not fractions. In Python, there is no limit to how long an integer value can be. |
How Python represents integers
Python, however, doesn’t use a fixed number of bit to store integers. Instead, Python uses a variable number of bits to store integers.
The maximum integer number that Python can represent depends on the memory available. |
Example 1: Creating int and checking type
num = -8
# print the data type
print(type(num))
|
Getting the size of an integer
from sys import getsizeof
counter = 100
size = getsizeof(counter)
print(size)
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Converting a String to a Float in Python
# python code to convert string
# to float
string = "90"
result = float(string)
print(result)
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Python integer operations
Python integers support all standard operations including:
Addition +
Subtraction –
Multiplication *
Division /
a = 10
b = 20
c = a + b
print(c)
print(type(c))
c = a - b
print(c)
print(type(c))
c = a * b
print(c)
print(type(c))
c = b/a
print(c)
print(type(c))
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30
<class 'int'>
-10
<class 'int'>
200
<class 'int'>
2.0
<class 'float'>
Python float
Python uses the float class to represent the real numbers.
Python float uses 8 bytes (or 64 bits) to represent real numbers.
Unlike the integer type, the float type uses a fixed number of bytes. |
Creating float and checking type
num = 3/4
# print the data type
print(type(num))
num = 6 * 7.0
print(type(num))
|
<class 'float'>
<class 'float'>
Converting an Integer to a Float in Python
# python code to convert int
# float
number = 90
result = float(number)
print(result)
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