Check if Key Exists in Python List Example

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If you want to check key exists or not in the python list then I will give you the following examples. we will use "in" with list for checking key exist or not.

Example 1:

main.py

# Created new List
myList=[ 1, 2, 3, 4, 5, 6 ]

  
# Key for check id exist or not
key=3

  
# Checking key exist or not in myList var
if key in myList:
    print("Given key is exist in List.")
else:
    print("Given key is not exist in List.")

Output:

Given key is exist in List.

Example 2:

main.py

# Created new List
myList=[ 1, 2, 3, 4, 5, 6 ]

  
# Checking key exist or not in myList var
for i in myList:
    if(i == 3):
        print("Given key is exist in List.")

Output:

Given key is exist in List.

Example 3:

main.py

# Created new List
myList=[ 1, 2, 3, 4, 5, 6 ]

  
# Checking key exist or not in myList var
if (3 in myList):
    print("Given key is exist in List.")
else:
    print("Given key is not exist in List.")

Output:

Given key is exist in List.