Break and Continue Commands in Python

This guide covers break and continue commands in python with practical context and easy-to-follow details. Use it to understand the subject and apply the information confidently.

In Python , the break and continue statements can change the "flow" of a normal loop.

These loops repeat a code block until the condition checks False, but sometimes we want to terminate the current loop or even the entire loop without checking the conditional expression. That's when we need the help of break and continue commands.

The break statement ends the loop containing it and passes the control to the next command after that loop's code block. If the break statement is in a nested loop (loop inside another loop), break will terminate the innermost loop.

Syntax of Break Order

break

Break order diagram:

If using break in the for Python loop, it will look like this:

for var in sequence:

 #kh?i code bên trong vòng l?p for

 if dieu_kien:

 break

 #code khác bên trong vòng l?p for

#code bên ngoài vòng l?p for

When break is executed, "#code inside the for loop" will be ignored and redirected to "#code outside the for loop".

If you use the break in the while loop, Python will look like this:

while dieu_kien_kiem_tra:

 #code bên trong vòng l?p while

 if dieu_kien:

 break

 #code khác bên trong vòng l?p while

#code bên ngoài vòng l?p while

When break is executed, "#code inside while loop" will be ignored and redirected to "#code outside the while loop".

Example of a Break Python Command

Example 1:

#S? d?ng break trong for

for val in "string":
 if val == "i":
 break
 print(val)

print("K?t thúc!")

In the above code, we loop the string "string", and check the condition, if the letter "i" will execute the break command, if another letter "i" prints to the screen. Running the above code we get the result that the previous letters "i" have been printed. Then the loop ends, as shown below:

str K?t thúc!

Example 2:

bien = 10 while bien > 0 : print ( 'Giá tr? bi?n hi?n t?i là: ' , bien) bien = bien - 1 if bien == 5 : break print ( "OK!")

The above code checks and prints the variable in descending value from 10, until the variable is equal to 5, the loop ends.

Giá tr? bi?n hi?n t?i là: 10
Giá tr? bi?n hi?n t?i là: 9
Giá tr? bi?n hi?n t?i là: 8
Giá tr? bi?n hi?n t?i là: 7
Giá tr? bi?n hi?n t?i là: 6

 OK!

The Continue Command in Python

The continue command is used to ignore the rest of the code inside the loop, applied to the current iteration. That means the loop does not terminate, it will continue with the next iteration.

Structure of continue:

continue

Diagram of the continue command in Python:

The continue statement in the for loop will look like this:

for var in sequence:

 #kh?i code bên trong vòng l?p for

 if dieu_kien:

 continue

 #code khác bên trong vòng l?p for

#code bên ngoài vòng l?p for

When the continue is executed, "#code inside the for loop" is ignored and returned to "# Block of code inside for for loop"

The continue statement in the while loop will look like this:

while dieu_kien_kiem_tra:

 #code bên trong vòng l?p while

 if dieu_kien:

 ti?p t?c 

 #code khác bên trong vòng l?p while

#code bên ngoài vòng l?p while

When the continue executing "#code khác bên trong vòng l?p while"Will be ignored and returned to "#code bên trong vòng l?p while"

For Example, the Continnue Command in Python

Example 3:

# S? d?ng continue trong for

for val in "string":
 if val == "i":
 continue
 print(val)

print("K?t thúc!")

This code is identical to the above, only replace the break command with continue. Here, when looping the string "string" to the letter "i" will ignore the print variable print (val) and return to the command if val == "i": , we get the result:

strng K?t thúc!

Example 4:

bien = 10
while bien > 0 :
 bien = bien - 1
 if bien == 5 :
 continue
 print ( 'Giá tr? bi?n hi?n t?i là: ' , bien)
print ( "OK!")

If bien = 5 then skip and repeat the next iteration, resulting in:

Giá tr? bi?n hi?n t?i là: 9 Giá tr? bi?n hi?n t?i là: 8 Giá tr? bi?n hi?n t?i là: 7 Giá tr? bi?n hi?n t?i là: 6 Giá tr? bi?n hi?n t?i là: 4 Giá tr? bi?n hi?n t?i là: 3 Giá tr? bi?n hi?n t?i là: 2 Giá tr? bi?n hi?n t?i là: 1 Giá tr? bi?n hi?n t?i là: 0

OK!

In the next section we will learn about pass commands and iterative techniques in Python, so you can watch!

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