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Python in Keyword

The Python in keyword is returns True if a certain element is present in a sequence [list/tuple/string/range], else it will return False. It is a case-sensitive keyword. It cannot be used as variable-name.

The in keyword is used in two purpose −

• To check if a value is present in a sequence in conditional statements.
• To iterate through a sequence in a loop.

Following is the syntax of the Python in keyword −

#Using if-else statement
if element in sequence:
    statement1
    statement2
else:
    statement3
    statement4

	
#using for loop
for element in sequence:
    statement1
    statement2

Following is the basic example of Python in keyword −

Var1="TutorialsPoint"
ele1='s'
ele2='z'
result_1 = ele1 in Var1
result_2 = ele2 in Var1
print("The element",ele1,"is present in",Var1,"True/False :",result_1)
print("The element",ele2,"is present in",Var1,"True/False :",result_2)

Following is the output of the above code −

The element s is present in TutorialsPoint True/False : True
The element z is present in TutorialsPoint True/False : False

The in keyword is used to find whether the element is present in the list or not. If it is present in the list, then it returns True else, returns False.

In the following example, We have created a list named List1 which contains some programming language and we are trying to check whether element namedele1 present in list or not −

List1 = ['Python','Java','mysql','CSS','HTML']
ele1='CSS'
if ele1 in List1:
    print(ele1,"is present in the given list :",List1)
else:
    print(ele1,"is not present in the given list :",List1)

Following is the output of the above code −

CSS is present in the given list : ['Python', 'Java', 'mysql', 'CSS', 'HTML']

The in is used to check the whether the element is in the given sequence or not. The sequence may be list, tuple, string, range. If the element is present in the sequence than the loop will execute.

Lets understand usage of in keyword in for loop. We have used range as a sequence. In this range, the first numeric value is included and second numeric value is excluded. As 15 value is excluded else block is executed −

for x in range(0,15):
    print(x,end=" ")
    
else:
    print("False")

Following is the output of the above code −

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 False

The in keyword can be used in tuple to identify whether the element is present in tuple or not.

Lets understand the in keyword in tuple with the following example −

Tuple1=(14,23,89,34,7)
ele1=100
if ele1 in Tuple1:
    print(ele1,"is present in given tuple :",Tuple1)
else:
    print(ele1,"is not present in given tuple :",Tuple1)

Following is the output of the above code −

100 is not present in given tuple : (14, 23, 89, 34, 7)

The in keyword in strings using for loop is used to iterate the given string.

Following is an example for in keyword in strings using for loop −

string1="TutorialsPoint"
for i in string1:
    print(i,end=" ")

Following is the output of the above code −

T u t o r i a l s P o i n t

python_keywords.htm

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