WHILE in Python

by netvital | Dec 29, 2022 | Python

WHILE in Python

WHILE loop is especially useful in Python programming, and we use it many times. In the WHILE loop, we start a loop until the condition in the loop becomes True and the loop stops.

In this loop, while first evaluates the desired condition, if the condition is correct, the command inside the loop is executed. After that, the condition is reevaluated and this process continues until the desired condition is violated and when the condition becomes False, the loop will stop.

Syntax:

while condition:

statement

In WHILE loop, we need a condition to stop loop, if we don’t write a condition to stop, loop will continue without stop. here are some examples:

while a > X:

print(‘Y’)
→ a=a-1

while a >= X:

print(a)
→ a-=1

Example : 

• a=1
• while a <= 5:
•    print (a)
•    a=a+1

Output:

1

2

3

4

5

Example : 

• a=1
• while True:
•    print (a)
•    if a==5:
•       break
•    a=a+1

Output :

The output for this example is same as the last one, I just wanted to teach you the same result in two ways.

Infinite while Loop in Python:

In this model of the loop, if the condition is True, the loop will run for infinity. In Python, to prevent this model of infinite loops, a workaround has been considered that if the compiler detects that the loop is not able to stop, it stops automatically. To avoid such infinite loops, we need a condition in the loop to stop.

while True:

statement

while True :

print(a)
a-=1

→ if a==X:

→ break

Example : 

• a=1
• while True:
•    print (a)
•    a=a+1

Output :

This loop will continue with non-stop

Python While loop with else:

while condition:

statement

else:

statement

Example : 

a = 1

while a <= 5:

print(a)

a = a + 1

else:

print(‘a is over‘)

Output :

1
2
3
4
5
a is over

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FOR in Python

by Admin | Dec 28, 2022 | Python

FOR in Python

Loops are used for sequential traversal, that’s mean used for repeating variables such as numbers, strings, lists or sets. The loop continues until it is terminated by the variable or by terminating the loop with the Break command. In this section, we want to learn how to use loops. loop in programming languages is an iterative method and is also found in other object-oriented languages. With a loop, we can execute a set of commands, once for each item. Loops in every programming language start with a set of rules, but they may be slightly different in structure. Python also has statements and conditional loops.

In the first part, we will introduce the FOR-loop Python. With this loop, we can iterate through instructions based on the number considered in the loop. First, we examine its structure:

for <var> in <iterable>:

<statement(s)>

In this structure, the “statement” repeats i times

let’s to see some example

for i in “Hello”:

print(i)

The output of this command: in five lines it prints Hello, line 1 first character, line 2 second character and … 

for i in “Hello”:

print(1)

The output of this command: in five lines it prints 1, line 1 print 1, line 2 print 1 and … 

for i in “55”:

print(i)

The output of this command: in two lines it prints 55, line 1 print 5, line 2 print 5 and … 

if we want to print for example from 1 to 50, we can use command range(): in this command we can make [start,stop,step] 

for i in range (3):

print(i)

The output of this command: in three lines it prints: line 1 print 0, line 2 print 1 and line 3 print 2

We must know range (3), prints 0,1,2. If we want to print 1,2,3 = for i in range (1,3+1)

With [step] we can skip numbers, for example: this prints 1,3,5 = for i in range (1,5+1,2):

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Condition IF in Python

by netvital | Dec 28, 2022 | Python

Condition IF in Python

We use the IF statement in programming to run a group of statements but only when a condition is met.

In this section, we want to introduce the syntax and examples of Condition IF in Python.

IF is one of the conditional commands that is very widely used in programming and learning it is recommended to everyone.

There are three forms of the IF In Python:

1. if
2. if  else
3. if   elif   else

elif allows to check multiple statements for TRUE and if one the condition was True then it execute those statements.

else: if all conditions were False then the last condition in ‘else’ will execute at the end.

we must know the conditional elements and here there are some elements:

a==b              Is a equal to b?

a !=b              Is NOT a equal to b?

a < b              Is a smaller than b?

a > b              Is a greater than b?

for using IF we have three steps:

if condition1:

statement a

if it’s True then compiler run it and skip others condition

elif condition2:

statement b

and if last IF was False then compiler check this part and if it’s True then compiler execute it and skip other conditions

elif condition3:

statement c

we can have another IF and if last ELIF was False then compiler check this part and if it’s True then compiler execute it and skip other conditions

else:

statement d

All conditions were False, and compiler runs this.

For Example:

if a > b:

    print (‘Yes’)

elif a < b:

    print (‘No’)

else:

    print (‘Equal’)

Nested IF in Python:

We can merge several IF into a single IF statement and this is called Nesting in programming languages.

First Condition: if condition1:

Second Condition: if condition2:

Third Condition: if condition3:

statement a

elif condition3-1:

statement b

else:

statement c

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