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

for loop (4/5)

Let's make our output a bit user-friendlier. Last time we iterated over all elements. Now let's iterate over indexes, and get elements by their indexes. For example, for countries, considering we know that each country is represented by two numbers, it will look like:


              12345678910111213
            
# countries data
countries = ['USA', (9629091, 331002651), 'Canada', (9984670, 37742154), 
             'Germany', (357114, 83783942), 'Brazil', (8515767, 212559417), 
             'India', (3166391, 1380004385)]

# construct user-friendlier for loop
for i in range(len(countries)): # it will iterate over all indexes
    if type(countries[i]) is tuple: # check if our element is tuple
        print('Area:', countries[i][0], 'sq km')
        print('Population:', countries[i][1])
        print('--------------')
    else:
        print('Country name:', countries[i])

There we used knowledge about our data, that each tuple is the length of 2. Also, we added a dotted line after each tuple to divide countries.

Task

Using the same approach as in the example, print the information about all people from the people list.

Task

Using the same approach as in the example, print the information about all people from the people list.

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

Everything was clear?

Section 6. Chapter 6

for loop (4/5)


              12345678910111213
            
# countries data
countries = ['USA', (9629091, 331002651), 'Canada', (9984670, 37742154), 
             'Germany', (357114, 83783942), 'Brazil', (8515767, 212559417), 
             'India', (3166391, 1380004385)]

# construct user-friendlier for loop
for i in range(len(countries)): # it will iterate over all indexes
    if type(countries[i]) is tuple: # check if our element is tuple
        print('Area:', countries[i][0], 'sq km')
        print('Population:', countries[i][1])
        print('--------------')
    else:
        print('Country name:', countries[i])

There we used knowledge about our data, that each tuple is the length of 2. Also, we added a dotted line after each tuple to divide countries.

Task

Using the same approach as in the example, print the information about all people from the people list.

Task

Using the same approach as in the example, print the information about all people from the people list.

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

Everything was clear?

Section 6. Chapter 6

for loop (4/5)


              12345678910111213
            
# countries data
countries = ['USA', (9629091, 331002651), 'Canada', (9984670, 37742154), 
             'Germany', (357114, 83783942), 'Brazil', (8515767, 212559417), 
             'India', (3166391, 1380004385)]

# construct user-friendlier for loop
for i in range(len(countries)): # it will iterate over all indexes
    if type(countries[i]) is tuple: # check if our element is tuple
        print('Area:', countries[i][0], 'sq km')
        print('Population:', countries[i][1])
        print('--------------')
    else:
        print('Country name:', countries[i])

There we used knowledge about our data, that each tuple is the length of 2. Also, we added a dotted line after each tuple to divide countries.

Task

Using the same approach as in the example, print the information about all people from the people list.

Task

Using the same approach as in the example, print the information about all people from the people list.

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

Everything was clear?


              12345678910111213
            
# countries data
countries = ['USA', (9629091, 331002651), 'Canada', (9984670, 37742154), 
             'Germany', (357114, 83783942), 'Brazil', (8515767, 212559417), 
             'India', (3166391, 1380004385)]

# construct user-friendlier for loop
for i in range(len(countries)): # it will iterate over all indexes
    if type(countries[i]) is tuple: # check if our element is tuple
        print('Area:', countries[i][0], 'sq km')
        print('Population:', countries[i][1])
        print('--------------')
    else:
        print('Country name:', countries[i])

There we used knowledge about our data, that each tuple is the length of 2. Also, we added a dotted line after each tuple to divide countries.

Task

Using the same approach as in the example, print the information about all people from the people list.

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

Section 6. Chapter 6

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