Python - Data Type and Manipulate Strings (Day 2)

This is a 100 Days challenge to learn a new language (Python). 100 Days of Code - The Complete Python Pro Bootcamp 

I will post some notes to motivate myself to finish this challenge.

Data Type

String

Ex:

print("Hello"[0])

print("123" + "456")

Result:

H 123456

Ex:

# It will be a pure integer calculation if quotation marks are removed

print(123 + 456)

Result:

579

Ex:

# Adding underscores between numbers can help the large number to be

readable, and python will remove it once it was executed.

print(123_456)

Result:

123456

Float

* 3.14159

Boolean

* True

* False

Type Conversion

Checking the data type

* type()

Ex:

# Checking data type

print(type(123))

print(type("123"))

Result:

<class 'int'> <class 'str'>

Converting

Convert to String

    str(123)

String to float

    float("3.14")

String to integer

    int("123")

Mathematical Operations

+        addition

-         subtraction

*        multiplication

/         division

**      exponent

Ex:

# 2 to the power of 3

print(2 ** 3)

Result:

8

Ex:

# checking the type after division

# After division, the data type will turn into 'float' not 'integer'

print(type(9/3))

Result:

<class 'float'>

Also, the order matters. 

Order Rules: PEMDAS

        ()      Parentheses

        **     Exponents

        *       Multiplication

        /        Division

        +       Addition

        -        Subtraction

Manipulate

round()         Return the nearest integer

//                  Floor division

Ex:

print(round(2.66666, 2))

print(3 / 2)

print(3 // 2)

Result:

2.67 1.5 1

f-string

It is a handy way to concatenate and print string with different data type.

Ex:

score = 60

print(f"your score is { score }")

Result:

your score is 60