Course Content

Learn Python from Scratch

1. The basics

Hello, World!Hello, me!Variables Comments Indentation Numbers and strings

2. Arithmetic operations

Addition Multiplication and power Division and whole part division

3. Common data types

Data types Numbers float and int Storing text Strings slicing Concatenation

4. Conditional statements

Boolean data type Combining conditions Simple if/else expressions (1/2)Simple if/else expressions (2/2)If/else expressions with multiple conditions (1/2)If/else expressions with multiple conditions (2/2)

5. Other data types

Lists (1/3)Lists (2/3)Lists (3/3)Tuples (1/3)Tuples (2/3)Tuples (3/3)Dictionaries (1/2)Dictionaries (2/2)

6. Loops

while loop (1/2)while loop (2/2)for loop (1/5)for loop (2/5)for loop (3/5)for loop (4/5)for loop (5/5)

7. Functions

Built-in functions Writing your own functions (1/5)Writing your own functions (2/5)Writing your own functions (3/5)Writing your own functions (4/5)Writing your own functions (5/5)lambda functions

Built-in functions

What if I ask you to define the maximum number in the list? Surely, using acquired knowledge, you can write a loop and check if the current element is greater/less than the previous and rewrite it, otherwise - continue... But in the case of big lists, this approach is very time-harmful... This task can be solved by using some built-in function.

min(x, y, ...) - minimum element of x, y, ...
max(x, y, ...) - maximum element of x, y, ...
abs(x) - absolute value of number
round(x, n) - rounds number x to n digits
pow(x, n) - x raised to the power n

For example, for countries we can calculate population density (population/area) and round result to 2 digits


              1234567
            
countries = [["USA", 9629091, 331002651], ["Canada", 9984670, 37742154],
             ["Germany", 357114, 83783942], ["Brazil", 8515767, 212559417],
             ["India", 3166391, 1380004385]]
# calculate population density for countries
for i in range(len(countries)):
    if type(countries[i]) is list:
        print(countries[i][0], 'has population density:', round(countries[i][2]/countries[i][1], 2))

Task

In the people list, all the heights are in cm. Transform it into inches (divide by 2.54), round result to 2 digits and print message "Name has height of x inches".

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Everything was clear?

Thanks for your feedback!

Section 7. Chapter 1

Built-in functions

min(x, y, ...) - minimum element of x, y, ...
max(x, y, ...) - maximum element of x, y, ...
abs(x) - absolute value of number
round(x, n) - rounds number x to n digits
pow(x, n) - x raised to the power n

For example, for countries we can calculate population density (population/area) and round result to 2 digits


              1234567
            
countries = [["USA", 9629091, 331002651], ["Canada", 9984670, 37742154],
             ["Germany", 357114, 83783942], ["Brazil", 8515767, 212559417],
             ["India", 3166391, 1380004385]]
# calculate population density for countries
for i in range(len(countries)):
    if type(countries[i]) is list:
        print(countries[i][0], 'has population density:', round(countries[i][2]/countries[i][1], 2))

Task

In the people list, all the heights are in cm. Transform it into inches (divide by 2.54), round result to 2 digits and print message "Name has height of x inches".

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Everything was clear?

Thanks for your feedback!

Section 7. Chapter 1

Built-in functions

min(x, y, ...) - minimum element of x, y, ...
max(x, y, ...) - maximum element of x, y, ...
abs(x) - absolute value of number
round(x, n) - rounds number x to n digits
pow(x, n) - x raised to the power n

For example, for countries we can calculate population density (population/area) and round result to 2 digits


              1234567
            
countries = [["USA", 9629091, 331002651], ["Canada", 9984670, 37742154],
             ["Germany", 357114, 83783942], ["Brazil", 8515767, 212559417],
             ["India", 3166391, 1380004385]]
# calculate population density for countries
for i in range(len(countries)):
    if type(countries[i]) is list:
        print(countries[i][0], 'has population density:', round(countries[i][2]/countries[i][1], 2))

Task

In the people list, all the heights are in cm. Transform it into inches (divide by 2.54), round result to 2 digits and print message "Name has height of x inches".

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Everything was clear?

Thanks for your feedback!

min(x, y, ...) - minimum element of x, y, ...
max(x, y, ...) - maximum element of x, y, ...
abs(x) - absolute value of number
round(x, n) - rounds number x to n digits
pow(x, n) - x raised to the power n

For example, for countries we can calculate population density (population/area) and round result to 2 digits


              1234567
            
countries = [["USA", 9629091, 331002651], ["Canada", 9984670, 37742154],
             ["Germany", 357114, 83783942], ["Brazil", 8515767, 212559417],
             ["India", 3166391, 1380004385]]
# calculate population density for countries
for i in range(len(countries)):
    if type(countries[i]) is list:
        print(countries[i][0], 'has population density:', round(countries[i][2]/countries[i][1], 2))

Task

In the people list, all the heights are in cm. Transform it into inches (divide by 2.54), round result to 2 digits and print message "Name has height of x inches".

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Section 7. Chapter 1

Switch to desktop for real-world practiceContinue from where you are using one of the options below