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Python in Keyword

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  • Last Updated : 28 Mar, 2022

In programming, a keyword is a “reserved word” by the language which conveys special meaning to the interpreter. It may be a command or a parameter. Keywords cannot be used as a variable name in the program snippet. Python language also reserves some of the keywords that convey special meaning. In Python, keywords are case sensitive.

“in” Keyword:

The in keyword has two purposes:

  • To check if a value is present in a list, tuple, range, string, etc.
  • To iterate through a sequence in a for loop.

Syntax:

# Using if statement
if ele in seq:
    statement(s)

# Using for statement
for ele in seq:
    statement(s)

Example 1: 

Python3




# Python program to demonstrate
# in keyword
 
 
# Create a list
animals = ["dog", "lion", "cat"]
 
# Check if lion in list or not
if "lion" in animals:
    print("Yes")

Output:

Yes

Example 2: 

Python3




# Python program to demonstrate
# in keyword
 
 
# Create a string
s = "GeeksforGeeks"
 
# Iterating through the string
for i in s:
     
    # if f occurs in the string
    # break the loop
    if i == 'f':
        break
     
    print(i)

Output:

G
e
e
k
s
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