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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

while loop (1/2)

Sometimes you need your code to run all the time when the condition holds. For example, in real life, we don't quit the metro train till we reach our station. I.e. if we need "Station B" we will miss "Station A", "Station C" and so on, until we reach "Station B". In Python you can write something like this using while loop:


              
12

            
while condition:
  do
copy

For example, we can print all the numbers to 10.


              
1234567

            
# assign starting number
i = 1

# while loop will print all the numbers to 10
while i < 10: # condition
  print(i) # action
  i = i + 1 # increasing variable
copy

You might notice, that we use i = i + 1 inside the loop. If we didn't specify that, our loop would be infinite, as every time it checked condition it got 1 < 10, which is True. Be careful while using this type of loop in order not to make your code execution infinite.

Task

  1. Create variable i with value 1.
  2. Using while loop print all the numbers less than 10 squared. Do not forget to increase your number on each step!

Task

  1. Create variable i with value 1.
  2. Using while loop print all the numbers less than 10 squared. Do not forget to increase your number on each step!

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

Everything was clear?

Section 6. Chapter 1
toggle bottom row

while loop (1/2)

Sometimes you need your code to run all the time when the condition holds. For example, in real life, we don't quit the metro train till we reach our station. I.e. if we need "Station B" we will miss "Station A", "Station C" and so on, until we reach "Station B". In Python you can write something like this using while loop:


              
12

            
while condition:
  do
copy

For example, we can print all the numbers to 10.


              
1234567

            
# assign starting number
i = 1

# while loop will print all the numbers to 10
while i < 10: # condition
  print(i) # action
  i = i + 1 # increasing variable
copy

You might notice, that we use i = i + 1 inside the loop. If we didn't specify that, our loop would be infinite, as every time it checked condition it got 1 < 10, which is True. Be careful while using this type of loop in order not to make your code execution infinite.

Task

  1. Create variable i with value 1.
  2. Using while loop print all the numbers less than 10 squared. Do not forget to increase your number on each step!

Task

  1. Create variable i with value 1.
  2. Using while loop print all the numbers less than 10 squared. Do not forget to increase your number on each step!

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

Everything was clear?

Section 6. Chapter 1
toggle bottom row

while loop (1/2)

Sometimes you need your code to run all the time when the condition holds. For example, in real life, we don't quit the metro train till we reach our station. I.e. if we need "Station B" we will miss "Station A", "Station C" and so on, until we reach "Station B". In Python you can write something like this using while loop:


              
12

            
while condition:
  do
copy

For example, we can print all the numbers to 10.


              
1234567

            
# assign starting number
i = 1

# while loop will print all the numbers to 10
while i < 10: # condition
  print(i) # action
  i = i + 1 # increasing variable
copy

You might notice, that we use i = i + 1 inside the loop. If we didn't specify that, our loop would be infinite, as every time it checked condition it got 1 < 10, which is True. Be careful while using this type of loop in order not to make your code execution infinite.

Task

  1. Create variable i with value 1.
  2. Using while loop print all the numbers less than 10 squared. Do not forget to increase your number on each step!

Task

  1. Create variable i with value 1.
  2. Using while loop print all the numbers less than 10 squared. Do not forget to increase your number on each step!

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

Everything was clear?

Sometimes you need your code to run all the time when the condition holds. For example, in real life, we don't quit the metro train till we reach our station. I.e. if we need "Station B" we will miss "Station A", "Station C" and so on, until we reach "Station B". In Python you can write something like this using while loop:


              
12

            
while condition:
  do
copy

For example, we can print all the numbers to 10.


              
1234567

            
# assign starting number
i = 1

# while loop will print all the numbers to 10
while i < 10: # condition
  print(i) # action
  i = i + 1 # increasing variable
copy

You might notice, that we use i = i + 1 inside the loop. If we didn't specify that, our loop would be infinite, as every time it checked condition it got 1 < 10, which is True. Be careful while using this type of loop in order not to make your code execution infinite.

Task

  1. Create variable i with value 1.
  2. Using while loop print all the numbers less than 10 squared. Do not forget to increase your number on each step!

Switch to desktop for real-world practiceContinue from where you are using one of the options below
Section 6. Chapter 1
Switch to desktop for real-world practiceContinue from where you are using one of the options below
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