The syntax you're looking for:
lambda x: True if x % 2 == 0 else False
But you can't use print or raise in a lambda.
GeeksforGeeks
geeksforgeeks.org › python › how-to-use-if-else-elif-in-python-lambda-functions
How to use if, else & elif in Python Lambda Functions - GeeksforGeeks
July 23, 2025 - # Use if-else in Lambda Functions # check if two numbers is equal or greater or lesser result = lambda x,y : f"{x} is smaller than {y}" \ if x < y else (f"{x} is greater than {y}" if x > y \ else f"{x} is equal to {y}") # print for numbers ...
Top answer 1 of 16
914
The syntax you're looking for:
lambda x: True if x % 2 == 0 else False
But you can't use print or raise in a lambda.
2 of 16
49
why don't you just define a function?
def f(x):
if x == 2:
print(x)
else:
raise ValueError
there really is no justification to use lambda in this case.
pandas - Python lambda function if else condition - Stack Overflow
Question: Trying to understand someone else's code. Can someone please explain what the lambda function is doing here?. Does the lambda function here translates to: If the first 3 digits of OrderNu... More on stackoverflow.com
Lambda if statement
You may be better just writing a normal function if it gets too complicated to understand, but for the sake of learning: something['SomeVariable'].apply(lambda x: dosomething() if isinstance(x, str) else dosomethingelse()) More on reddit.com
can I use an if statement with a lambda function?
It helps to debug if you split your 1 liner into multiple variable steps at each function. I haven't worked with python but it appears the problem may be in your last map. It appears what you want is to filter for len(x['pdd_list']) == 0 in a filter function. .map(lambda x: x['pdd_list']) . filter(lambda x: len(x['pdd_list'])==0) More on reddit.com
if else and for loop in lambda
this is a list comprehension rather than a lambda expression Lambdas look like this list.sort(key=lambda x: x.y) More on reddit.com
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AskPython
askpython.com › python › examples › lambda-with-if-else-conditions
Lambda With Conditional Statements in Python - AskPython
December 31, 2021 - Let’s look at a few examples of the lambda function. ... The code is simple. We first create a lambda object as add. Then we store two parameters inside the lambda expression. These parameters are two numbers that are for the addition operation. After that in the colon, we place the addition expression in front of the colon. ... Using the lambda with if-else conditions is a useful technique.
TutorialsPoint
tutorialspoint.com › article › how-to-use-if-else-amp-elif-in-python-lambda-functions
How to use if, else & elif in Python Lambda Functions
March 27, 2026 - categorize_number = lambda num: "Positive" if num > 0 else "Negative" if num < 0 else "Zero" print(categorize_number(5)) print(categorize_number(-2)) print(categorize_number(0)) ... Lambda functions with conditionals are commonly used with built-in functions like map(), filter(), and sorted() ?
Python Examples
pythonexamples.org › python-lambda-if-else
Python Lambda - If Else, Nested If Else
value_1 is returned if condition_1 is true, else condition_2 is checked. value_2 is returned if condition_2 is true, else value_3 is returned. In the following example program, we will write a lambda function that returns square of number if number is even, else cube of the number.
Delft Stack
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if...else in Lambda Function Python | Delft Stack
February 25, 2025 - For more complex conditional logic, you can nest if statements within a lambda function. This allows for multiple conditions to be evaluated in a single expression. Here’s how you can implement this: nested_if_lambda = lambda x: "Positive" if x > 0 else ("Negative" if x < 0 else "Zero") result1 = nested_if_lambda(10) result2 = nested_if_lambda(-5) result3 = nested_if_lambda(0) print(result1) print(result2) print(result3)
GeeksforGeeks
geeksforgeeks.org › lambda-with-if-but-without-else-in-python
Lambda with if but without else in Python - GeeksforGeeks
October 6, 2021 - It can have any number of arguments but only one expression, which is evaluated and returned. It must have a return value. Since a lambda function must have a return value for every valid input, we cannot define it with if but without else ...
Kanoki
kanoki.org › 2022 › 09 › 12 › python-lambda-if-else-elif-with-multiple-conditions-and-filter-list-with-conditions-in-lambda
python lambda if, else & elif with multiple conditions and filter list with conditions in lambda | kanoki
September 12, 2022 - We can use if-else and elif and multiple conditions using lambda function in Python.
CodeRivers
coderivers.org › blog › lambda-function-python-if-else
Lambda Function with `if-else` in Python: A Comprehensive Guide - CodeRivers
April 24, 2025 - In this example, we create a lambda function that takes two arguments x and y and returns their sum. We can incorporate if-else statements within a lambda function to add conditional logic.
TutorialsPoint
tutorialspoint.com › lambda-with-if-but-without-else-in-python
Lambda with if but without else in Python
July 17, 2023 - grades = [85, 92, 78, 65, 88, 95, ... syntactically, you can achieve "if without else" behavior using filter() for selection or map() with None for transformation....
Dataquest
dataquest.io › home › blog › how to use a lambda function in python
Lambda Functions in Python (With Examples)
April 21, 2026 - Separate them with commas, just like a regular function: (lambda x, y, z: x + y + z)(3, 8, 1) # Output: # 12 · A lambda can also return multiple values by wrapping them in a tuple: (lambda x, y: (x + y, x * y))(3, 4) # Output: # (7, 12) You can use conditional logic inside a lambda too. A single if/else is perfectly readable and common in practice:
OpenGenus
iq.opengenus.org › python-lambda-if-else
Python lambda if else
November 27, 2022 - This is because the one line alternative of if else has the else part as mandatory. Hence, it is not possible to create a Lambda in Python with only if part that is without else part. As an alternative, place a default value or NoneType in else part of the Lambda function in Python.
Eikke
eikke.com › python-ifelse-in-lambda › index.html
Python if/else in lambda – Ikke's blog
The one limitation that most disappoints me is that Python lacks is a functional way of writing if/else. Sometimes you just want to do something like this: lambda x : if_else(x>100, “big number”, “little number”)
Stack Overflow
stackoverflow.com › questions › 71260517 › python-lambda-function-if-else-condition › 71260558
pandas - Python lambda function if else condition - Stack Overflow
import sqlalchemy as sq import pandas as pd data_df = pd.read_csv('/dbfs/FileStore/tables/CustomerOrders.txt', sep=',', low_memory=False, quotechar='"', header='infer' , encoding='cp1252') data_df[OrderNumber] = data_df[OrderNumber].apply(lambda x: x if x[:3] != '486' and x[:3] != '561' and x[:1] != '8' else "") .............
GeeksforGeeks
geeksforgeeks.org › python › python-lambda-anonymous-functions-filter-map-reduce
Python Lambda Functions - GeeksforGeeks
1. Condition Checking: lambda function can use conditional expressions (if-else) to return different results based on a condition.
Published: May 18, 2026