Continue Within a Nested for Loop
Not as elegant as it should be
Photo by Johannes Plenio on UnsplashWe all know that Python is an elegant programming language. But everything has weaknesses. Sometimes Python is not as elegant as it should be.
For example, when we need to break out of nested loops as follows:
for a in list_a:
for b in list_b:
if condition(a,b)…
In this article, you will learn to use break and continue statements to alter the flow of a loop.
Video: Python break and continue Statement
What is the use of break and continue in Python?
In Python, break
and continue
statements can alter the flow of a normal loop.
Loops iterate over a block of code until the test expression is false, but sometimes we wish to terminate the current iteration or even the whole loop without checking test expression.
Thebreak
and continue
statements are used in these cases.
Python break statement
The break
statement terminates the loop containing it. Control of the program flows to the statement immediately after the body of the loop.
If the break
statement is inside a nested loop (loop inside another loop), the break
statement will terminate the innermost loop.
Syntax of break
break
Flowchart of break
Flowchart of break statement in Python
The working of break statement in for loop and while loop is shown below.
Working of the break statement
Example: Python break
# Use of break statement inside the loop for val in "string": if val == "i": break print(val) print("The end")
Output
s t r The end
In this program, we iterate through the "string" sequence. We check if the letter is i, upon which we break from the loop. Hence, we see in our output that all the letters up till i gets printed. After that, the loop terminates.
Python continue statement
The continue
statement is used to skip the rest of the code inside a loop for the current iteration only. Loop does not terminate but continues on with the next iteration.
Syntax of Continue
continue
Flowchart of continue
Flowchart of continue statement in Python
The working of the continue
statement in for and while loop is shown below.
How continue statement works in python
Example: Python continue
# Program to show the use of continue statement inside loops for val in "string": if val == "i": continue print(val) print("The end")
Output
s t r n g The end
This program is same as the above example except the break
statement has been replaced with continue
.
We continue with the loop, if the string is i, not executing the rest of the block. Hence, we see in our output that all the letters except i gets printed.
Table of Contents
- What is the use of break and continue in Python?
- Python break statement
- Syntax of break
- Flowchart of break
- Example of break
- Python continue statement
- Syntax of Continue
- Flowchart of continue
- Example: Python continue
How do you continue in a nested while loop in Python?
7 Answers.
Break from the inner loop (if there's nothing else after it).
Put the outer loop's body in a function and return from the function..
Raise an exception and catch it at the outer level..
Set a flag, break from the inner loop and test it at an outer level..
Refactor the code so you no longer have to do this..
How do you continue a nested loop?
When continue statement is used in a nested loop, it only skips the current execution of the inner loop. Java continue statement can be used with label to skip the current iteration of the outer loop too.
How do you continue a for loop in Python?
The continue keyword is used to end the current iteration in a for loop (or a while loop), and continues to the next iteration.
Does continue break out of nested for loop?
Break out of nested loops with else and continue You can break all loops with else and continue . The code with explanation is as follows. When the inner loop ends normally without break , continue in the else clause is executed.
Source: https://lovelyristin.com/how-to-continue-in-a-nested-loop-python
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