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Python map() and lambda() Use Cases and Examples

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 In Python, map() and lambda functions are often used together for functional programming. Here are some examples to illustrate how they work. Python map and lambda top use cases 1. Using map() with lambda The map() function applies a given function to all items in an iterable (like a list) and returns a map object (which can be converted to a list). Example: Doubling Numbers numbers = [ 1 , 2 , 3 , 4 , 5 ] doubled = list ( map ( lambda x: x * 2 , numbers)) print (doubled) # Output: [2, 4, 6, 8, 10] 2. Using map() to Convert Data Types Example: Converting Strings to Integers string_numbers = [ "1" , "2" , "3" , "4" , "5" ] integers = list ( map ( lambda x: int (x), string_numbers)) print (integers) # Output: [1, 2, 3, 4, 5] 3. Using map() with Multiple Iterables You can also use map() with more than one iterable. The lambda function can take multiple arguments. Example: Adding Two Lists Element-wise list1 = [ 1 , 2 , 3 ]
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How does Marchant Initiate Voice Authentication When Card Not Present

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Voice transaction is a method to pay the bills for a merchant at POS. The scenario is when you visit a Retailer where you purchased for Rs1000. You forgot to carry a card (Card is not present) with you but you remember card details. Then you can ask the merchant to use Voice authentication for completing the payment.


Credit Cards Domain: How Voice Transaction Works

About Voice Authentication

  1. After you start the call, the first step is you need to enter the merchant id. Usually, your Call goes to Card Issuer.
  2. Then you need to select an option like you are doing a transaction for the Credit card.
  3. You need to enter your card number and expiry date.
  4. Select the option for Card present or Card not present.
  5. Enter the amount you need to pay.
  6. Then Card issuer's call center provides you a 6 digit approval code. You need to tell the approval code to the merchant, and the merchant also will get a message. Then the merchant completes the transaction using the Voice approval code.

Notes: Sometimes Merchant Service provider also facilitates to get Voice authorization approval.

How Merchant gets Funds

  1. After the merchant gets an approval code from the customer, he has to enter customer details into the Merchant service provider system.
  2. A merchant also would need to enter the approval code.
  3. Merchant will submit the transactions to the service provider. So that the merchant will receive funds.

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