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Learn Python from Scratch
course content

Course Content

Learn Python from Scratch

Learn Python from Scratch

1. The basics
Hello, World!Hello, me!VariablesCommentsIndentationNumbers and strings
2. Arithmetic operations
AdditionMultiplication and powerDivision and whole part division
3. Common data types
Data typesNumbersfloat and intStoring textStrings slicingConcatenation
4. Conditional statements
Boolean data typeCombining conditionsSimple 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 functionsWriting 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

Strings slicing

You can refer to element(s) in your string. To do that, use indexes inside square brackets and note that indexation in Python starts from 0, so for the string with 5 symbols ("Hello"), the last symbol ("o") will have index 4.

Also, you can get multiple symbols in one action. To do so, separate starting and finishing position plus 1 with : (for example, if you want elements with indexes from 1 to 4, you need to write 1:5, as the right limit is exclusive). At the same time, you can refer to elements in reverse order, i.e., call the very last element as the first in reverse order. Use the minus - sign to do it. If you want to know the total number of symbols in your string, use the len() function. Please note that numeration in reverse order starts from 1 (as there is no minus zero, which makes it logical).

For example:


              
12345678910

            
# create new string
string = "This is string in Python"
# let's get the first element
print(string[0])
# let's get all the elements from index 3 to 8
print(string[3:9])
# let's get the last but one element
print(string[-2])
# let's get the number of symbols in this string
print(len(string))
copy

Task

Given string "This is string for learning" assigned to variable test_str. You need to:

  1. Extract the very first and very last symbols.
  2. Extract word string.
  3. Get the length of this string.

Task

Given string "This is string for learning" assigned to variable test_str. You need to:

  1. Extract the very first and very last symbols.
  2. Extract word string.
  3. Get the length of this string.

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

Everything was clear?

Section 3. Chapter 5
toggle bottom row

Strings slicing

You can refer to element(s) in your string. To do that, use indexes inside square brackets and note that indexation in Python starts from 0, so for the string with 5 symbols ("Hello"), the last symbol ("o") will have index 4.

Also, you can get multiple symbols in one action. To do so, separate starting and finishing position plus 1 with : (for example, if you want elements with indexes from 1 to 4, you need to write 1:5, as the right limit is exclusive). At the same time, you can refer to elements in reverse order, i.e., call the very last element as the first in reverse order. Use the minus - sign to do it. If you want to know the total number of symbols in your string, use the len() function. Please note that numeration in reverse order starts from 1 (as there is no minus zero, which makes it logical).

For example:


              
12345678910

            
# create new string
string = "This is string in Python"
# let's get the first element
print(string[0])
# let's get all the elements from index 3 to 8
print(string[3:9])
# let's get the last but one element
print(string[-2])
# let's get the number of symbols in this string
print(len(string))
copy

Task

Given string "This is string for learning" assigned to variable test_str. You need to:

  1. Extract the very first and very last symbols.
  2. Extract word string.
  3. Get the length of this string.

Task

Given string "This is string for learning" assigned to variable test_str. You need to:

  1. Extract the very first and very last symbols.
  2. Extract word string.
  3. Get the length of this string.

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

Everything was clear?

Section 3. Chapter 5
toggle bottom row

Strings slicing

You can refer to element(s) in your string. To do that, use indexes inside square brackets and note that indexation in Python starts from 0, so for the string with 5 symbols ("Hello"), the last symbol ("o") will have index 4.

Also, you can get multiple symbols in one action. To do so, separate starting and finishing position plus 1 with : (for example, if you want elements with indexes from 1 to 4, you need to write 1:5, as the right limit is exclusive). At the same time, you can refer to elements in reverse order, i.e., call the very last element as the first in reverse order. Use the minus - sign to do it. If you want to know the total number of symbols in your string, use the len() function. Please note that numeration in reverse order starts from 1 (as there is no minus zero, which makes it logical).

For example:


              
12345678910

            
# create new string
string = "This is string in Python"
# let's get the first element
print(string[0])
# let's get all the elements from index 3 to 8
print(string[3:9])
# let's get the last but one element
print(string[-2])
# let's get the number of symbols in this string
print(len(string))
copy

Task

Given string "This is string for learning" assigned to variable test_str. You need to:

  1. Extract the very first and very last symbols.
  2. Extract word string.
  3. Get the length of this string.

Task

Given string "This is string for learning" assigned to variable test_str. You need to:

  1. Extract the very first and very last symbols.
  2. Extract word string.
  3. Get the length of this string.

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

Everything was clear?

You can refer to element(s) in your string. To do that, use indexes inside square brackets and note that indexation in Python starts from 0, so for the string with 5 symbols ("Hello"), the last symbol ("o") will have index 4.

Also, you can get multiple symbols in one action. To do so, separate starting and finishing position plus 1 with : (for example, if you want elements with indexes from 1 to 4, you need to write 1:5, as the right limit is exclusive). At the same time, you can refer to elements in reverse order, i.e., call the very last element as the first in reverse order. Use the minus - sign to do it. If you want to know the total number of symbols in your string, use the len() function. Please note that numeration in reverse order starts from 1 (as there is no minus zero, which makes it logical).

For example:


              
12345678910

            
# create new string
string = "This is string in Python"
# let's get the first element
print(string[0])
# let's get all the elements from index 3 to 8
print(string[3:9])
# let's get the last but one element
print(string[-2])
# let's get the number of symbols in this string
print(len(string))
copy

Task

Given string "This is string for learning" assigned to variable test_str. You need to:

  1. Extract the very first and very last symbols.
  2. Extract word string.
  3. Get the length of this string.

Switch to desktop for real-world practiceContinue from where you are using one of the options below
Section 3. Chapter 5
Switch to desktop for real-world practiceContinue from where you are using one of the options below
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