Python break and continue

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 test expression is false, but sometimes we wish to terminate the current iteration or even the whole loop without checking test expression.
The break 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 break statement is inside a nested loop (loop inside another loop), break will terminate the innermost loop.

Syntax of break

break

#example of break in while loop

i=1
while(i<=10):
    if(i>5):
        break
    print(i)
    i=i+1

Output:

1
2
3
4
5
>>>

#example of break in for loop

n=list(range(1,11))
for i in n:
    if(i>5):
        break
    print(i)

Output:

1
2
3
4
5
>>>

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

#example of continue in for loop
#to print only odd nos

n=list(range(1,11))
for i in n:
    if(i%2==0):
        continue
    print(i)

Output:

1
3
5
7
9
>>>

#to print only even nos

n=list(range(1,11))
for i in n:
    if(i%2==1):
        continue
    print(i) 

Output:

2
4
6
8
10
>>>

#example of continue in while loop
#to print only odd nos

i=1
while(i<=10):
    if(i%2==0):
        i=i+1
        continue
    print(i)
    i=i+1

Output:

1
3
5
7
9
>>>

#to print only even nos

i=1
while(i<=10):
    if(i%2==1):
        i=i+1
        continue
    print(i)
    i=i+1  

Output:

2
4
6
8
10
>>>

What is pass statement in Python?

In Python programming, pass is a null statement. The difference between a comment and pass statement in Python is that, while the interpreter ignores a comment entirely, pass is not ignored.
However, nothing happens when pass is executed. It results into no operation (NOP).

Syntax of pass

pass

We generally use it as a placeholder.
Suppose we have a loop or a function that is not implemented yet, but we want to implement it in the future. They cannot have an empty body. The interpreter would complain. So, we use the pass statement to construct a body that does nothing.

Example: pass Statement

# pass is just a placeholder for
# functionality to be added later.

n = {‘h’, ‘e’, ‘l’, ‘l’,’o’}
for val in n:
pass

We can do the same thing in an empty function or class as well.

def function(args):
pass

class example:
pass

Python Basic Programming Tutorial

Python Introduction     Getting started in Python Programming      Python propgramming fundamentals     Python Operators    Python If Condition     Python for loop    Python range construct      Python While loop    break and continue statements     Different looping techniques     Python List     Python String     Python Functions    Python Inbuilt Functions     Python Recursion     Using Python Library     Python Tuples     Python Dictionary     Python Sets     Python Strings     Python Exception Handling     Python Data File Handling

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