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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

bookCombining conditions

Often we need to check if multiple conditions hold, and only then decide to continue or not. In boolean algebra, there are two common operators: OR and AND. What do they do?

Operator OR checks if at least one condition holds (i.e. is True) and returns True in that case; otherwise - False.
Operator AND checks if all the conditions hold and returns True in that case; otherwise - False.

For example, imagine that you decide whether go outside or not. If there is good weather AND today is Saturday/Sunday, then you can go; otherwise - not. Here we check if both conditions hold, and only in case when all are True, we will go outside.

In Python, you can use the same words but in lowercase, i.e. condition1 or condition2, condition1, and conditon2. Also, you can combine multiple ands and ors. Parentheses are common there.

For example, let's check the following conditions:

  1. If 2 greater than 1 and "bbb" greater than "aaa"
  2. If the second index symbol in the string "my string" equals "y" or "s"

              
1234

            
# check the first two conditions
print(2 > 1 and "bbb" > "aaa")
# check the next two conditions
print("my string"[2] == "y" or "my string"[2] == "s")
copy

Task

  1. Given variable t with some string assigned to it. Check the following conditions: if number of characters in this string is less than 15 and number of letter 'n' in this string greater than 2
  2. Given numerical variable a. You need to check if this variable is greater than 9475/37 or the remainder of the division by 14 is less than 7.

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Section 4. Chapter 2
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bookCombining conditions

Often we need to check if multiple conditions hold, and only then decide to continue or not. In boolean algebra, there are two common operators: OR and AND. What do they do?

Operator OR checks if at least one condition holds (i.e. is True) and returns True in that case; otherwise - False.
Operator AND checks if all the conditions hold and returns True in that case; otherwise - False.

For example, imagine that you decide whether go outside or not. If there is good weather AND today is Saturday/Sunday, then you can go; otherwise - not. Here we check if both conditions hold, and only in case when all are True, we will go outside.

In Python, you can use the same words but in lowercase, i.e. condition1 or condition2, condition1, and conditon2. Also, you can combine multiple ands and ors. Parentheses are common there.

For example, let's check the following conditions:

  1. If 2 greater than 1 and "bbb" greater than "aaa"
  2. If the second index symbol in the string "my string" equals "y" or "s"

              
1234

            
# check the first two conditions
print(2 > 1 and "bbb" > "aaa")
# check the next two conditions
print("my string"[2] == "y" or "my string"[2] == "s")
copy

Task

  1. Given variable t with some string assigned to it. Check the following conditions: if number of characters in this string is less than 15 and number of letter 'n' in this string greater than 2
  2. Given numerical variable a. You need to check if this variable is greater than 9475/37 or the remainder of the division by 14 is less than 7.

Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
Everything was clear?

How can we improve it?

Thanks for your feedback!

Section 4. Chapter 2
toggle bottom row

bookCombining conditions

Often we need to check if multiple conditions hold, and only then decide to continue or not. In boolean algebra, there are two common operators: OR and AND. What do they do?

Operator OR checks if at least one condition holds (i.e. is True) and returns True in that case; otherwise - False.
Operator AND checks if all the conditions hold and returns True in that case; otherwise - False.

For example, imagine that you decide whether go outside or not. If there is good weather AND today is Saturday/Sunday, then you can go; otherwise - not. Here we check if both conditions hold, and only in case when all are True, we will go outside.

In Python, you can use the same words but in lowercase, i.e. condition1 or condition2, condition1, and conditon2. Also, you can combine multiple ands and ors. Parentheses are common there.

For example, let's check the following conditions:

  1. If 2 greater than 1 and "bbb" greater than "aaa"
  2. If the second index symbol in the string "my string" equals "y" or "s"

              
1234

            
# check the first two conditions
print(2 > 1 and "bbb" > "aaa")
# check the next two conditions
print("my string"[2] == "y" or "my string"[2] == "s")
copy

Task

  1. Given variable t with some string assigned to it. Check the following conditions: if number of characters in this string is less than 15 and number of letter 'n' in this string greater than 2
  2. Given numerical variable a. You need to check if this variable is greater than 9475/37 or the remainder of the division by 14 is less than 7.

Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
Everything was clear?

How can we improve it?

Thanks for your feedback!

Often we need to check if multiple conditions hold, and only then decide to continue or not. In boolean algebra, there are two common operators: OR and AND. What do they do?

Operator OR checks if at least one condition holds (i.e. is True) and returns True in that case; otherwise - False.
Operator AND checks if all the conditions hold and returns True in that case; otherwise - False.

For example, imagine that you decide whether go outside or not. If there is good weather AND today is Saturday/Sunday, then you can go; otherwise - not. Here we check if both conditions hold, and only in case when all are True, we will go outside.

In Python, you can use the same words but in lowercase, i.e. condition1 or condition2, condition1, and conditon2. Also, you can combine multiple ands and ors. Parentheses are common there.

For example, let's check the following conditions:

  1. If 2 greater than 1 and "bbb" greater than "aaa"
  2. If the second index symbol in the string "my string" equals "y" or "s"

              
1234

            
# check the first two conditions
print(2 > 1 and "bbb" > "aaa")
# check the next two conditions
print("my string"[2] == "y" or "my string"[2] == "s")
copy

Task

  1. Given variable t with some string assigned to it. Check the following conditions: if number of characters in this string is less than 15 and number of letter 'n' in this string greater than 2
  2. Given numerical variable a. You need to check if this variable is greater than 9475/37 or the remainder of the division by 14 is less than 7.

Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
Section 4. Chapter 2
Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
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